Deck Construction cost in Philadelphia, PA
A typical deck construction in Philadelphia, Pennsylvania models at $15,200 – $33,300, with a mid point around $22,100. Philadelphia carries a labour index of 1.14, a material index of 1.03 and a permit index of 1.2 against the national base, in climate zone 4A with a 36 in frost depth. That is a whole-job model — 11 scoped tasks, 27 days elapsed, 21% contractor overhead and profit and 8% contingency — not a per-unit rate multiplied out. Renolume states 100/100 confidence (High confidence) for a standard property here.
Modelled by the Renolume estimating model · engine 2.0.0, data v2026.1 · Last updated . Every figure on this page is produced by the Renolume engine at the stated engine and data version. Nothing is scraped, crowd-sourced or supplied by a contractor, and no figure is edited by hand after the model runs.
What drives deck construction cost in Philadelphia
Why this job is priced differently in Philadelphia than anywhere else. Everything below is local: the wage base, the supply chain, the permit regime and the weather the assembly has to survive.
| Local factor | Value used | What it means for your quote |
|---|---|---|
| Labour market | 1.14× national base | Philadelphia is a unionised, historically industrial trade market with experienced exterior crews and burdened rates above the national basis. Row-house and twin construction dominates the older core, which favours crews who work that stock routinely. |
| Material supply | 1.03× national base | Covers freight distance and local supply depth. It moves less than labour, but it moves. |
| Permit regime | 1.20× national base | The city runs its own permitting regime, distinct from the surrounding Pennsylvania and New Jersey suburbs, and historic-district review applies across large parts of the older housing stock. |
| Climate exposure | Zone 4A · frost 36 in | Climate zone 4A: a genuine but moderate freeze-thaw winter, humid summers and coastal-influenced storm exposure. Frost depth of roughly 36 inches puts real cost into anything that must be founded below grade. |
| Wage sample quality | measured | A measured wage sample for CBSA 37980, which is why this city page is published and indexed. |
Attached housing stock
Party walls, shared parapets and zero-lot-line access change both the scope and the staging on a routine job.
Historic review
Large parts of the older metro carry material and appearance constraints that narrow the specification before cost is considered.
Street access and staging
Narrow streets, permit parking and limited setback convert equipment work into hand labour and add mobilisation time.
Moderate freeze-thaw
A real cycling season, shorter than the interior Midwest, concentrated on edges, parapets and flashings.
Permits, inspections and scheduling in Philadelphia
Permits, inspections, crew availability and season in Philadelphia — the part of a project that has nothing to do with the material you pick.
The city runs its own permitting regime, distinct from the surrounding Pennsylvania and New Jersey suburbs, and historic-district review applies across large parts of the older housing stock.
Modelled permit allowance for this job: $200 – $1,000.
Inspection focuses on fire separation between attached dwellings, flashing at party walls and drainage. On historic properties, the review can constrain visible materials before performance is even discussed.
3 days of inspection wait is modelled inside the 21 days–71 days elapsed window.
Good availability overall, with a smaller pool of crews genuinely experienced in attached row-house work — which is exactly the stock where inexperience is most expensive.
Late spring to early autumn is the reliable exterior window. Winter work happens but sealant cure and short days constrain it, and the humid mid-summer stretch slows roof work in the afternoons.
2 day(s) of weather buffer are carried for this metro.
Deck Construction in Philadelphia: Footings must reach below a roughly 36-inch frost line, and rear-yard access on attached stock often means hand-carrying every material.
Planning deck construction in Philadelphia: what local homeowners should know
Planning guidance written for Philadelphia specifically — the answers change city by city because the labour market, the code regime, the climate and the access conditions do.
Philadelphia sits above the national basis on labour but below the New York metro, and the number on your quote is usually decided by the building type rather than the market. On an attached property, party-wall flashing, parapet detailing and shared drainage are real scope that a detached-house quote does not contain, and staging on a narrow street costs hours before any work begins. Add historic review where it applies, and the specification can be set by the district rather than by your preference.
Access and approval, more than weather. Staging on a constrained street, coordinating with a neighbour on a shared wall, and waiting on a historic or city review are the delays homeowners actually experience. Winter compresses the working day and slows sealant cure, but it rarely stops a job here the way it does further north.
This is a mixed-load climate: a real but moderate freeze-thaw cycle, humid summers and coastal-influenced wind. Edge and parapet detailing carries more of the durability outcome than the field material does, and on attached stock the flashing and termination details matter more than any product choice. Where historic review applies, appearance requirements can decide the material outright, so check that before comparing performance.
Late spring through early autumn, with the paperwork started well before. In historic districts the approval, not the crew, sets your earliest possible start, so file first and book second. Avoid committing to a late-autumn slot that depends on warm-weather sealant cure.
Confirm whether your property is attached, whether it sits in a historic district, and where materials and skips can legally be staged. Those three answers change the scope more than anything else in this metro. Then ask specifically how each contractor proposes to handle the party wall or parapet — the quality of that answer separates crews who work this stock from crews who do not.
The usual surprise is discovering that the neighbour's condition is now your problem: shared parapets and party-wall flashings cannot be replaced cleanly on one side. The second is a historic review that rules out the specification a contractor already quoted.
None of this changes the scope of the job — it changes what the job costs and how long it takes here. Model your own deck construction in Philadelphia to replace these standard-property assumptions with your roof pitch, access, condition and specification, and to raise the confidence score this page reports.
Decking material comparison
Cost, service life, upkeep, efficiency and installation difficulty side by side — the trade-off, not just the price.
| Decking material | Modelled cost | Step up | Rate per sq ft | Elapsed time |
|---|---|---|---|---|
| Pressure-treated pine | $15,100 – $32,500 | baseline | $47 – $102 | 29 days |
| Capped composite | $15,200 – $33,300 | +$400 | $48 – $104 | 27 days |
| Hardwood or PVC | $15,200 – $33,300 | +$400 | $48 – $104 | 27 days |
| Decking material | Service life | Maintenance | Energy | Installation | Planning note |
|---|---|---|---|---|---|
| Pressure-treated pine | 10–15 years for the surface | Highest. Clean and re-seal every one to three years or it greys, checks and splinters. | n/a | Lowest. Universally available and stocked. | Lowest cost today, highest cost over twenty years once upkeep is counted. |
| Capped composite | 25–30 years | Low. Wash only; no sealing cycle. | n/a | Low, but hidden-fastener systems slow installation slightly. | The default choice. Dark boards get notably hot underfoot in full sun. |
| Hardwood or PVC | 25–50 years | Moderate for hardwood (oiling), very low for PVC. | n/a | Highest. Hardwood needs pre-drilling and skilled labour. | Specify for appearance and longevity; confirm fastener and joist spacing requirements up front. |
Cost by size in Philadelphia, PA
Every row is a separate run of the same model at the same specification — only the size changes. Note how the per sq ft rate falls as the job grows: fixed costs like permits, mobilisation and disposal setup do not scale with size.
| Deck size | Typically | Modelled cost | Rate per sq ft | Elapsed time |
|---|---|---|---|---|
| 10 x 12 ft (120 sq ft) | small landing or grill deck | $9,100 – $20,200 | $75 – $169 | 25 days |
| 12 x 16 ft (192 sq ft) | table for four plus circulation | $11,300 – $24,800 | $59 – $129 | 26 days |
| 16 x 20 ft (320 sq ft) | the most common family deck | $15,200 – $33,300 | $48 – $104 | 27 days |
| 20 x 24 ft (480 sq ft) | dining and lounge zones together | $20,600 – $44,800 | $43 – $93 | 30 days |
| 24 x 30 ft (720 sq ft) | large multi-use deck | $28,600 – $62,000 | $40 – $86 | 33 days |
Why deck construction costs what it does in Philadelphia compared with other metros
Identical scope, identical specification, priced against each metro's own wage sample. Philadelphia models above the 11-metro average of $19,800 – $24,200, because of above-average unionised labour rates combined with attached-housing scope and historic-district constraints.
| Metro | Modelled cost | Labour index | Elapsed time | Why it sits here |
|---|---|---|---|---|
| Dallas, TX | $13,700 – $29,100 | 0.96 | 27 days | low labour and permit base offset by hail-driven specification upgrades and post-storm market volatility |
| Cleveland, OH | $13,600 – $29,400 | 0.98 | 27 days | labour, material and permit indices all near the national base, with condition risk from older housing stock |
| Houston, TX | $13,800 – $29,300 | 0.93 | 27 days | deep competitive labour pool and the lowest permit burden modelled, offset by wind-resistance scope |
| Atlanta, GA | $13,900 – $29,700 | 0.95 | 27 days | competitive labour, negligible frost work and a moderate permit burden across a highly fragmented jurisdictional map |
| Detroit, MI | $14,100 – $30,300 | 1.02 | 27 days | near-national labour rates carrying genuinely severe cold-climate detailing requirements and older housing stock |
| Denver, CO | $14,800 – $32,200 | 1.06 | 27 days | mid-range labour rates with hail-driven specification requirements and claim-cycle market volatility |
| Philadelphia, PA (this page) | $15,200 – $33,300 | 1.14 | 27 days | above-average unionised labour rates combined with attached-housing scope and historic-district constraints |
| Chicago, IL | $15,700 – $34,500 | 1.18 | 27 days | high union labour base plus code-driven cold-climate detailing |
| Seattle, WA | $16,200 – $35,700 | 1.24 | 27 days | high burdened labour rates, long permit and contractor lead times, and an energy code that sets a specification floor |
| New York, NY | $17,600 – $39,600 | 1.38 | 27 days | logistics, insurance and filing procedure on top of the highest permit index modelled |
| San Francisco, CA | $18,100 – $40,700 | 1.42 | 27 days | highest modelled wage base, slow permit throughput and compliance-driven specification floors |
The spread is not arbitrary. Dallas sits at the bottom of this table because of low labour and permit base offset by hail-driven specification upgrades and post-storm market volatility, while San Francisco sits at the top because of highest modelled wage base, slow permit throughput and compliance-driven specification floors. Scope, task list and specification are identical in every row — what changes between cities is what it costs to staff, supply, permit and access the same job.
See the national deck construction model for the full picture across every modelled metro, or read how the regional indices are built.
What is actually in the job
The task list below is the same in every city; what changes in Philadelphia is what it costs to staff, supply, permit and access — above-average unionised labour rates combined with attached-housing scope and historic-district constraints.
Labour $3,300 – $6,500 · materials $9,000 – $15,400 · other costs $200 – $1,200 · overhead and profit $1,900 – $6,500 · contingency $900 – $3,600. 82.5 modelled labour hours across 3 trades.
- Install decking boards$4,300 – $6,800
- Frame beams, joists and blocking$2,600 – $5,000
- Install guardrail system$2,200 – $4,000
- Form, pour and set footings and posts$900 – $1,900
- Build stairs and handrail$700 – $1,400
Other costs most quotes omit
- Building permit$200 – $1,000
- Footing and final inspection fees$0 – $300
Regional movement: labour index 1.14 · material index 1.03 · permit index 1.2. Labour rates derived from published wage data for Philadelphia, PA (measured).
How long deck construction takes in Philadelphia
6.4 days of active work, 13 days of waiting (permits, inspections, weather), and material lead time of 7 days–28 days.
- Layout, permit & demolition0.5 days
- Excavation & footings1.2 days + 5 days wait
- Framing1.5 days + 3 days wait
- Decking1.6 days
- Railing & stairs1.1 days
- Finishing & inspection0.5 days + 3 days wait
In Philadelphia the schedule usually turns on approvals and access rather than on crew speed — particularly on attached properties and in historic districts.
Why this number
12 named conditions can change this estimate. 5 already apply to the standard case, and each one is shown with its cause and its effect. Which of them fire in Philadelphia is shaped by local conditions — see the Philadelphia planning guidance above.
Guardrail required above 30 in
- Adds “Install guardrail system” to the scope
- A guardrail is required where the walking surface is more than 30 in above grade.
Stairs required
- Adds “Build stairs and handrail” to the scope
Deep frost line
- Increases the quantity of tm.footing by 35%
- Increases labour on Excavate footings by 20%
- Footings must extend below the local frost line, which increases excavation and concrete.
Attached deck
- Ledger flashing is the most common cause of deck failure; insist on inspection before decking is laid.
Hidden fasteners on composite
- Adds “Hidden fastener clip system” to the scope
- Increases labour on Install decking boards by 22%
- Guardrail required above 30 in
- Elevated deck
- Stairs required
- Rock excavation
- Clay soil
- Deep frost line
- Attached deck
- Freestanding deck
- Existing deck removal
- Hidden fasteners on composite
- Pressure-treated finishing
- Lighting selected
Confidence score: 100/100 (High confidence)
Renolume publishes how much to trust the number instead of hiding the uncertainty. This page scores a standard property; answering the planner questions raises the score because the model has more to work with. Wage data is measured here, but the model cannot see from an address whether the property is attached, carries a parapet or sits in a historic district. Any of those can move the real number materially.
- Location precisionmeasured20/20
- Dimensions supplied3/325/25
- Existing-condition information3/320/20
- Material & option selections6/615/15
- Structural / utility / concealed risknone flagged20/20
How this estimate is produced
No contractor supplies these prices, no figure is scraped, and no number is crowd-sourced. Here is the whole chain.
| Step | What happens | Why it matters to you |
|---|---|---|
| 1. Scope | A fixed task library breaks the job into discrete tasks with a trade, a crew size and a productivity rate. This job models 82.5 labour hours across 3 trades. | Nothing is priced that is not described. You can see every task and argue with any of them. |
| 2. Labour | Hours are priced against published government occupational wage data, burdened for payroll costs and scaled to Philadelphia, Pennsylvania by a labour index of 1.14. | The regional difference is an index you can see, not a guess folded into a national average. |
| 3. Materials | Quantities are derived from your inputs with waste factors, then priced at the selected specification and scaled by a material index of 1.03. | Changing specification changes the material line only — the labour model does not silently move. |
| 4. Other costs | Permits, disposal, protection and equipment, with a permit fee index of 1.2. | These are the lines most quotes leave out and most homeowners discover late. |
| 5. Overhead and contingency | 21% contractor overhead and profit, then 8% contingency for conditions nobody can see before the job is opened up. | A real business has to cover both. Estimates that omit them are structurally too low. |
| 6. Confidence | The model scores how much it actually knows about your property and widens the displayed range when it knows less. | You are told how much to trust the number instead of being given false precision. |
Engine version 2.0.0, data version v2026.1, effective 2026-04-01. Full methodology · How the confidence score works
Why two honest quotes can differ this much
Modelled spread on this job is $15,200 – $33,300. Real quotes often spread wider, and it is rarely because one contractor is dishonest.
| Reason | What it looks like on the quote |
|---|---|
| Different scope | One bid includes disposal, permits and finishing; the other assumes you handle them. Same headline job, different work. |
| Different specification | Grade of new deck components — the accessories, not the headline product — is where most silent savings are made. |
| Different risk appetite | A firm carrying a real contingency prices higher and change-orders less. A firm carrying none does the reverse. |
| Different overhead | Licensed and insured crews with warranty support and office staff cost more to run than a truck and two people. |
| Different backlog | A busy contractor prices to be worth interrupting the schedule. The same firm bids differently in the off season. |
| Different assumptions about the unknown | Whoever assumes the least concealed damage looks cheapest on paper and is the most likely to change-order. |
The practical defence is to compare on scope lines rather than totals. Use the breakdown above as the checklist, and ask any bidder missing a line whether it is excluded or simply unpriced.
Repair or replace?
The decision before the budget. Renolume has no reason to push you toward the larger job.
| What you are seeing | What it usually means |
|---|---|
| Surface boards are worn but framing is sound | Re-deck only. Keeping the frame and replacing the surface is far cheaper than a full rebuild. |
| Posts or joists are soft at the ground or the ledger | Replace. Structural rot cannot be surfaced over. |
| Ledger has no visible flashing | Investigate immediately. This is a safety issue, not a cosmetic one. |
| Deck is a different size than you now need | Rebuild. Extending an existing frame rarely costs less than building right. |
Planning a new deck
The parts of a new deck that a cost table cannot tell you.
Most attached decks are permitted work with a footing inspection before concrete and a framing inspection before decking. Those two hold points, not the carpentry, are what stretch a deck project across weeks.
Footings must reach below the local frost line. In a cold-climate metro that can mean four feet of excavation per pier; in a warm one, a fraction of that. Same deck, materially different groundwork.
Terms on your quote, defined
The handful of terms that appear on every quote and change what you are comparing.
- Ledger
- The board attaching the deck to the house. Bad ledger flashing is the leading cause of deck collapse and of wall rot behind the deck.
- Footing
- The concrete pier carrying each post, taken below the local frost line. Frost depth is climate-set and drives excavation cost.
- Guardrail trigger
- Decks above roughly 30 in from grade require a code-compliant guardrail. The height threshold changes the price step, not the deck size.
- Joist spacing
- Composite and diagonal board layouts often require tighter joist spacing than pressure-treated, which adds framing before any decking is laid.
DIY versus contractor
Savings are labour only — materials, disposal and permits do not change.
You could take on
- Excavate footings (advanced)
- Install decking boards (moderate)
- Hidden fastener clip system (moderate)
- Fascia, skirting and trim (moderate)
Leave to a licensed contractor
- Layout, string lines and permit coordination — Licensed or code-regulated work
- Form, pour and set footings and posts — Structural footings and inspection sign-off
- Install ledger board and flashing — Primary structural connection to the house
- Frame beams, joists and blocking — Structural framing
- Install guardrail system — Guardrail load requirements
- Build stairs and handrail — Rise/run code compliance
- Punch list and final inspection — Licensed or code-regulated work
Owner-performed work on attached stock is the least advisable of any metro modelled: party-wall and parapet detailing carries liability for a neighbour's property as well as your own.
Model your own deck construction in Philadelphia
Everything above prices a standard property. Your house is not a standard property, and the difference is usually larger than the difference between cities. The deck construction planner runs the same engine on your inputs and returns a cost range, an itemised scope, a phased timeline, Good/Better/Best options and a confidence score that rises as you answer.
- Size, condition and access replace the standard-property defaults behind the $15,200 – $33,300 range on this page.
- 12 named conditions are re-tested against your answers instead of assumed away — each one shown with its cause and its effect.
- The confidence score moves off 100/100, because the model is working from your inputs rather than Philadelphia averages.
- Local context is carried through: Confirm whether your property is attached, whether it sits in a historic district, and where materials and skips can legally be staged.
Open the deck construction planner for Philadelphia — it takes a few minutes, nothing is emailed to a contractor, and you can save and compare scenarios side by side afterwards.
Key takeaways
- Deck construction in Philadelphia, PA models at $15,200 – $33,300, mid point $22,100 at the Better specification.
- Expect 21 days to 71 days elapsed, of which only 6.4 days is active work.
- The model states 100/100 confidence for a standard property, and 12 named conditions can move the number.
- Philadelphia prices differently from other metros because of above-average unionised labour rates combined with attached-housing scope and historic-district constraints.
- 21% contractor overhead and profit and 8% contingency are inside the range — a quote without them is not cheaper, it is incomplete.
- Framing and footings, not decking boards, are the majority of a deck budget.
- Height above grade sets whether guardrails are required and is a genuine price step.
- Pressure-treated is cheapest to build and most expensive to own.
- If the frame is sound, re-decking beats rebuilding by a wide margin.
Questions homeowners ask before hiring
How much does a deck construction cost in Philadelphia?
A deck construction on a standard property in Philadelphia, Pennsylvania models at $15,200 – $33,300 at the Better specification, with a mid point around $22,100. That figure is a whole-job model — labour, materials, 2 other cost lines, 21% contractor overhead and profit and 8% contingency — not a per-unit line item multiplied out.
Which material makes the most sense in Philadelphia?
In Philadelphia the same scope models at $15,100 – $32,500 with pressure-treated pine and $15,200 – $33,300 with hardwood or pvc, so material is the largest choice you control on this project. Footings must reach below a roughly 36-inch frost line, and rear-yard access on attached stock often means hand-carrying every material. This page compares every modelled option side by side; each material has its own page setting out service life, upkeep and the cases where it is the wrong choice.
Why does a deck construction cost more or less in Philadelphia than the national average?
Three published indices explain almost all of it: a labour index of 1.14 against the national wage base, a material index of 1.03 covering freight and local supply, and a permit fee index of 1.2. Philadelphia is a unionised, historically industrial trade market with experienced exterior crews and burdened rates above the national basis. Row-house and twin construction dominates the older core, which favours crews who work that stock routinely. Nothing about the job itself changes between cities — only what it costs to staff, supply and permit it.
Do I need a permit for a deck construction in Philadelphia?
The city runs its own permitting regime, distinct from the surrounding Pennsylvania and New Jersey suburbs, and historic-district review applies across large parts of the older housing stock. A permit line is modelled into this estimate at $200 – $1,000, scaled by the Philadelphia permit fee index of 1.2. Treat it as a budgeted allowance and confirm the exact requirement with your local building department before work starts — an unpermitted job can create problems at resale.
What will the inspector check in Philadelphia?
Inspection focuses on fire separation between attached dwellings, flashing at party walls and drainage. On historic properties, the review can constrain visible materials before performance is even discussed. Renolume models 3 days of inspection wait inside the 27 days elapsed timeline, because the waiting — not the inspection itself — is what shows up on your calendar.
How hard is it to get a good contractor in Philadelphia?
Good availability overall, with a smaller pool of crews genuinely experienced in attached row-house work — which is exactly the stock where inexperience is most expensive. Whatever the local market, compare bids on scope lines rather than on the total: this page lists 11 modelled tasks and 2 other cost lines, and a bid that is missing several of them is not cheaper, it is incomplete.
When is the best time of year to schedule a deck construction in Philadelphia?
Late spring to early autumn is the reliable exterior window. Winter work happens but sealant cure and short days constrain it, and the humid mid-summer stretch slows roof work in the afternoons. Renolume carries 2 day(s) of weather buffer for this metro inside the modelled elapsed window of 21 days to 71 days. Off-peak scheduling more often shortens lead time than it lowers price.
How long does a deck construction take in Philadelphia?
Renolume models 6.4 days of active work and 13 days of waiting — permits, inspections, material lead time and weather buffer — for a total elapsed window of 21 days to 71 days. Crews on site is the short part; the calendar is dominated by what happens between phases.
What are the hidden costs of a deck construction in Philadelphia?
The costs most quotes leave out are already in this model: Footing and final inspection fees ($0 – $300). On top of that, 8% contingency is carried for conditions nobody can see until the job is opened up, and these are explicitly excluded: Retaining walls, grading or drainage work; Roof structures, pergolas and screening; Hot tub structural reinforcement.
Can I do a deck construction myself, or do I need a contractor?
Renolume models $0 to $0 of labour that a capable owner could take on — typically Excavate footings, Install decking boards, Hidden fastener clip system. These stay with a licensed contractor: Layout, string lines and permit coordination, Form, pour and set footings and posts, Install ledger board and flashing, because of code, insurance or safety exposure. DIY savings are labour only; materials, disposal and permits do not change.
How deep do deck footings need to go in Philadelphia?
Below the local frost line, which is set by climate rather than by design. Footings must reach below a roughly 36-inch frost line, and rear-yard access on attached stock often means hand-carrying every material. Renolume models the excavation accordingly, and the footing inspection hold point — not the carpentry — is normally what stretches a deck project across weeks. Total modelled elapsed window: 21 days to 71 days.
What local factors change this number in Philadelphia?
Attached housing stock: Party walls, shared parapets and zero-lot-line access change both the scope and the staging on a routine job. Historic review: Large parts of the older metro carry material and appearance constraints that narrow the specification before cost is considered. Street access and staging: Narrow streets, permit parking and limited setback convert equipment work into hand labour and add mobilisation time. Moderate freeze-thaw: A real cycling season, shorter than the interior Midwest, concentrated on edges, parapets and flashings. All three published indices behind those factors are stated on this page — labour 1.14, material 1.03, permit 1.2 — and 2 day(s) of local weather buffer are carried in the timeline. Site access, storey height and existing conditions are modelled separately in the planner because they are property-specific, not city-specific.
Is it worth repairing instead of a full deck construction?
A targeted repair is normally worth it when the failure is isolated and the rest of the assembly still has service life. Once the damaged share approaches roughly a third of the whole, repair economics collapse — you pay set-up, access and disposal twice, and the two halves age differently. Model the full job at $15,200 – $33,300 first, then compare a quoted repair against it rather than against a national average.
How accurate is this estimate for Philadelphia?
This page carries a confidence score of 100/100 (High confidence) for a generic property, because it assumes a standard case rather than yours. Wage data for Philadelphia is measured sample quality (CBSA 37980), which is one of the 5 stated factors behind the score. Answering the planner questions raises it, because the model then has real inputs instead of defaults.
Where does the Philadelphia cost data come from?
Labour hours come from a fixed task library, wage rates from published government wage data at measured sample quality for Philadelphia, and regional movement from a labour index of 1.14, a material index of 1.03 and a permit index of 1.2. Nothing is scraped, crowd-sourced or supplied by a contractor. Data version v2026.1, effective 2026-04-01.
Assumptions, exclusions and data sources
These are the model's standing assumptions for a Philadelphia property. Where local practice overrides them — permits, inspections, season — that is set out in the Philadelphia sections above.
- Footings are assumed at one per 48 sq ft of deck area with a minimum of four.
- Footing depth follows the local frost line recorded for your region.
- Pressure-treated decks require re-staining every 2–3 years; that recurring cost is shown separately, not in the build total.
- Retaining walls, grading or drainage work
- Roof structures, pergolas and screening
- Hot tub structural reinforcement
- Utility relocation beneath the deck footprint
- Published government occupational wage data for Philadelphia (measured sample quality, CBSA 37980), scaled by a labour index of 1.14.
- A fixed task and productivity library — 82.5 modelled hours across 3 trades — rather than contractor-supplied prices.
- Regional material index 1.03 and permit fee index 1.2 for Pennsylvania.
- Engine version 2.0.0, data version v2026.1, effective 2026-04-01. Nothing is scraped, crowd-sourced or quoted by a contractor.
Get this priced for your actual house
Answer six questions and the range narrows to your property, your access, your existing conditions.
Planning estimate only. This is not a quote, bid or appraisal. Ranges reflect typical market conditions for the stated data version and do not account for site-specific concealed conditions, local code interpretation or contractor availability. Always obtain written bids. Data version v2026.1. Last updated . Methodology.