Roof replacement cost in Philadelphia
Philadelphia roofing is row-house roofing. The dominant job in the city is not a sloped shingle replacement but a flat or very low-slope roof over an attached house, usually finished in modified bitumen or a coated membrane, and often replaced in sections over decades rather than all at once. That, plus a large stock of buildings old enough to sit in historic districts, makes Philadelphia one of the markets where a national cost-per-square figure is least useful.
Typical Philadelphia roof replacement
2,000 sq ft roof · modified bitumen (low slope) · full replacement · moderate pitch
$12,100 – $19,800
Pricing data updated May 2025 · metro-level data for Philadelphia, PA · contains sample data
Confidence
Limited40/100
- Local data coverage21/32
Metro-level pricing data available
- Data recency6/20
Newest pricing data is about 16 months old.
- Project detail supplied3/22
Still assumed: planes, skylights, chimneys, existing material....
- Source quality7/16
Weighted by contribution: Home Cost Doctor internal model (sample data) (90%), BLS Occupational Employment and Wage Statistics (10%).
- Range tightness3/10
The modelled range spans about 51% of the typical price.
The underlying pricing data is more than a year old. Material costs move faster than that.
Some prices in this estimate are sample data shipped for development, not observed market pricing. The score is capped at 60 until verified sources are connected.
How reliable is this?
Updated as data lands
- Labour
- Government data
- Materials
- Partly observed
- Local coverage
- 17 cities
- Geometry
- Exact
Bureau of Labor Statistics wage release for May 2025, occupation 47-2181 (roofers), across 15 metro areas.
2 of 24 material rows come from observed prices; the rest are modelled.
Metro-level pricing in 15 markets and written local guidance for 17 cities. Anywhere else falls back to national figures, and the confidence score says so.
Pitch multipliers, roof area and material quantities are arithmetic, not estimates.
About 65% of a typical re-roof is still priced from modelled rows, so every estimate is capped at a confidence of 60 until that changes. We would rather show you that than a confident-looking number we cannot stand behind. Sources and licences
Your roof, not the average one
Philadelphia roof cost calculator
The numbers above describe a representative local project. This one describes yours.
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Scope details
These are the line items that most often explain why two quotes on the same house differ.
Site, quality and extras
Access and product grade are the two things satellite-measured quotes usually get wrong.
Local ranges
Philadelphia roofing costs by size and material
Sizes use the local common job (full replacement). The material table below is always a full replacement, so materials stay comparable with each other.
Small home
1,400 sq ft roof
$8,900
to $14,550
Average home
2,000 sq ft roof
$12,100
to $19,800
Large home
2,800 sq ft roof
$16,300
to $26,750
Very large home
3,800 sq ft roof
$21,500
to $35,450
| Material (common locally) | 2,000 sq ft roof | Per square | Service life |
|---|---|---|---|
| Modified bitumen (low slope) | $12,100 – $19,800 | $755 | 12–20 yrs |
| TPO single-ply membrane (low slope) | $12,100 – $20,450 | $765 | 15–25 yrs |
| Architectural asphalt shingle | $10,800 – $16,050 | $640 | 20–30 yrs |
| Natural slate | $34,600 – $71,200 | $2,400 | 75–150 yrs |
Why prices here are what they are
What drives roofing costs in Philadelphia
The typical roof is flat, attached and reached from inside
On a row house there is no eave, no driveway and often no rear access. Material goes up through the building or over a neighbour's roof with permission. That constrains crew size and is a legitimate reason a Philadelphia quote exceeds a suburban one for the same square footage.
Silver-coated and cold-process systems are a local convention
Modified bitumen with a reflective coating is the traditional Philadelphia flat roof and is still widely installed. Coatings are maintenance, not a roof: a coating over a failed membrane buys a season or two. Ask whether you are being quoted a new membrane or a recoat, because the price difference and the lifespan difference are both large.
Party-wall and parapet flashing is the failure point
Where your roof meets the neighbour's wall is the most common leak source in a row house, and the hardest thing to price from the street. A quote that does not mention party-wall or parapet flashing has not looked at the actual problem.
Historic districts add review, not just cost
Parts of the city fall under Historical Commission jurisdiction, where visible roofing material can require review before replacement. That is a schedule risk more than a price one, but discovering it after signing is expensive in time.
Permits and inspections
Philadelphia requires a permit for roof replacement through the Department of Licenses and Inspections, and contractors must hold a city contractor licence in addition to any state registration. Verify the licence number with L&I directly rather than accepting a number printed on a quote.
Pennsylvania: Pennsylvania has no statewide trade licence for roofing, but contractors must register as Home Improvement Contractors with the Office of Attorney General. Philadelphia additionally licenses contractors through L&I.
When to book the work
Crews are busy, lead times stretch and there is less room to negotiate. Book earlier than you think you need to, and treat an unusually fast start date as a question rather than a bonus.
A short installation season. Asphalt shingle sealant strips need warmth to bond properly, so winter work carries a real quality risk.
April through October for full replacement. Cold-process and torch-applied systems both have temperature minimums, and a membrane installed below them may look correct and fail at the seams. Emergency repair runs year-round.
Where the money goes
Cost breakdown for a typical Philadelphia roof
A 2,000 sq ft replacement, itemised the way a contractor builds their own price.
Every line item, with how it was calculated
| Item | Low | Typical | High |
|---|---|---|---|
| Modified bitumen (low slope)22.0 squares (incl. 10% waste) x $168/squareHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $2,860 | $3,696 | $4,950 |
| Synthetic underlayment22.0 squares x $25/squareHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $396 | $550 | $748 |
| Starter, ridge cap, drip edge and fasteners20.0 squares x $46/squareHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $640 | $920 | $1,300 |
| Flashing - standard20.0 squares x $18/squareHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $240 | $360 | $560 |
| Continuous ridge vent68 linear ft x $10/ftHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $476 | $680 | $1,020 |
| Decking replacement allowance2 sheets x $98 eachAn allowance, not a measurement. Deck condition is only known once the old roof is off - make sure your contract states the per-sheet price beyond this.Home Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $150 | $196 | $280 |
| Installation labour67 crew hours x $51.7/hrSite factors applied: pitch x1.05, storeys x1, roof shape x1.12, access x1.BLS Occupational Employment and Wage Statisticsyour metro areaMay 2025. Data quality: Modelled. Derived from a published source by a documented calculation. | $2,875 | $3,466 | $4,214 |
| Tear-off (1 layer)12 crew hours x $51.7/hrBLS Occupational Employment and Wage Statisticsyour metro areaMay 2025. Data quality: Modelled. Derived from a published source by a documented calculation. | $514 | $620 | $754 |
| Roll-off container (delivery and haul)1 container for 1.3 tons of debrisHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $380 | $520 | $700 |
| Landfill / transfer station fees1.3 tons x $72/tonHome Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $62 | $94 | $143 |
| Permit allowanceModelled allowance for PhiladelphiaPermit fees are set by the authority having jurisdiction and are knowable exactly. Confirm the real fee for your address.Home Cost Doctor internal model (sample data)nationalAugust 2026. Data quality: Sample. Our own placeholder. Plausible, but not observed in the market. | $150 | $320 | $700 |
| Direct costCombined in quadrature, not by stacking every worst case | $9,916 | $11,421 | $13,639 |
| Contractor overhead and profit | $2,181 | $3,655 | $6,138 |
| Estimated price | $12,100 | $15,100 | $19,800 |
Where the numbers come from
What the Philadelphia figures are built on
Weighted by money rather than by how many sources we can list. Anything still resting on our own sample figures is named as such.
- Home Cost Doctor internal model (sample data)Sample · national · August 2026 · 9 line items64%of direct cost
- BLS Occupational Employment and Wage StatisticsModelled · your metro area · May 2025 · 2 line items36%of direct cost
- Sample
- Our own placeholder. Plausible, but not observed in the market.
- Modelled
- Derived from a published source by a documented calculation.
64% of this estimate rests on sample data. That is the honest limit of what we can tell you today, and it is why the confidence score above is capped. Replacing it with observed pricing is the work we are doing next.
Trend
How roofing costs have moved
PPI: prepared asphalt and tar roofing and siding products
index (1982=100)
Latest
372.3
Year on year
+3.6%
Since 2024
+7.7%
Methodology. PPI: prepared asphalt and tar roofing and siding products, series WPU1361, as published. 31 monthly readings from 2024-01-01 to 2026-07-01. Values are transcribed unchanged; the index measures producer price movement, not a retail or installed price.
Local questions
Roofing in Philadelphia
A contractor offered to coat my roof for a fraction of a replacement. Is that a good deal?
It depends entirely on the condition of what is underneath. A coating on a sound membrane is legitimate maintenance that extends life. A coating over a wet or failed membrane hides the problem and traps moisture. Ask what happens if it leaks in a year, and get the answer in writing.
My house is over a hundred years old. Does that change the roof?
Often yes. Older row houses may have multiple accumulated layers, original wood decking, and parapet conditions that need masonry work before roofing. None of that is unusual, but it should be inspected and priced rather than assumed.
Why do quotes vary so much for the same row house?
Access and scope, mostly. One contractor may be pricing a full tear-off to the deck with new parapet flashing; another a recover of the field only. They are different jobs. Comparing the totals without comparing the scope is the single most common mistake here.
Nearby
ZIP-level pages and related tools
A ZIP code gets its own page only where the housing stock or local conditions differ enough from the city as a whole to change the answer.
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Before you sign anything
We also cover 19103, 19125, 19128, 19147 in the calculator. They do not have their own pages because we have nothing to say about them that this page does not already say better.
Every figure on this page is generated by the same estimation engine as the calculator, from pricing rows scoped to Philadelphia, PA where we have them and national figures where we do not. Read the methodology for how the model is built, or the data sources page for what is behind the numbers and under what licence.