Philadelphia · a free referral service, not a builder
Roof decks & pilot houses in Philadelphia
Planning a roof deck on your rowhome, or replacing a tired one? Tell us about the house and we’ll pass it to an independent Philadelphia builder for a free quote. We are a referral service, not a contractor, and our guides explain the City’s zoning, permit and historic rules in plain English.
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We are a free referral service, not a contractor. We pass your request to an independent Philadelphia contractor who quotes and does the work.
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Zoning Code § 14-604(5)
Four numbers that shape a Philly roof deck
- 5 ft
- back from the front building line, unless the top story is already set back 5 ft
- 48 in
- maximum height of the deck surface above the roof’s mid-plane
- 42 in
- maximum height for guard rails; privacy screens up to 60 in, no more than 50% opaque
- 125 sq ft
- pilot house limit outside RM-2/3/4, RMX-3, CMX-3/4/5 and IRMX (+40 sq ft with an elevator)
Summary only. Exceptions and district rules apply. Read the full rules guide.
What we help with
New roof decks
Design, structure, framing, decking and railings for a new deck on a rowhome.
Read morePilot houses & roof access
Stair enclosures and hatches, and the zoning size limits.
Read moreRoof deck repair & replacement
Rotting boards, loose railings, and when to rebuild.
Read moreRoofing under the deck
The flat roof beneath: when to replace it, and how decks protect it.
Read moreDesign, engineering & permits
Drawings, structural review, zoning and building permits.
Read moreCan I build a roof deck?
Zoning limits, permits and historic review, with the code quoted.
Rules guideThe short version of the City’s rules
Philadelphia’s Zoning Code allows roof decks for residential uses in every zoning district, within limits on setback, height, railings and the size of the stair enclosure:
| Rule (Zoning Code § 14-604(5)) | What it says |
|---|---|
| Where allowed | Roof decks are permitted for residential uses in all zoning districts, but not on accessory structures such as garages |
| Front setback | At least 5 ft back from the front building line, unless the top story is already set back 5 ft |
| Deck height | No part of the deck surface more than 48 in above a plane midway between the roof’s lowest and highest points |
| Railings | Guard rails or fences no taller than 42 in; privacy screens up to 60 in and no more than 50% opaque on the sides, within 18 in of a side lot line |
| Access structure (pilot house) | May only enclose the stairs, elevator or other access; max 125 sq ft (+40 sq ft with an elevator) outside RM-2, RM-3, RM-4, RMX-3, CMX-3, CMX-4, CMX-5 and IRMX; max 10 ft above the deck |
| Access structure setbacks | Same setback as the deck, plus 5 ft more for any part over 42 in above the deck; 5 ft from the rear building line |
Most roof decks also need structural review, because the existing roof framing was usually not built to carry people, furniture and planters. Read the full rules guide.
What a roof deck costs in Philadelphia
Philly Home Collective, a local real estate team, gives these example totals for Fishtown roof decks:
| Project | Published range |
|---|---|
| Simple, small deck with minimal structural work | $15,000–$35,000 |
| Mid-range: waterproofing upgrade, engineered reinforcement, composite or pavers | $35,000–$70,000 |
| High-end: extensive structure, premium materials, pilot house | $70,000–$150,000+ |
National figures run lower: HomeAdvisor puts the average rooftop deck at $11,250. Philadelphia projects often include structure, roofing and a pilot house, which national averages may not. See the full cost guide with sources.
How it works
- Tell us about the house and the deck with the short form. It takes about a minute.
- We pass it to an independent local builder who does roof decks in your part of the city.
- The builder contacts you, looks at the roof, and gives you a quote. You decide. There is no cost or obligation to use our service.
We are a free referral service, not a contractor. We pass your request to an independent Philadelphia contractor who quotes and does the work. The contractor, not us, sets prices and is responsible for the design, permits, licensing and work. We may receive a fee from contractors we refer. Full disclosure.
Signs your existing deck needs attention
- Railings or posts that move when you lean on them
- Soft, split or rotting boards, or fasteners working loose
- Leaks or stains on the top-floor ceiling under the deck
- A roof under the deck that hasn’t been inspected in years
- A pilot house door, hatch or skylight that leaks
- A home sale or inspection coming up
Neighborhoods we cover
All of Philadelphia. Roof decks look different across the city: newer rowhomes in Fishtown and Point Breeze, historic rowhouses in Society Hill and Rittenhouse, hillside views in Manayunk. We wrote a page for each of these neighborhoods:
- FishtownOld rowhomes, new construction, and a lot of interest in roof decks. The big questions here are structure, roofing and the pilot house.
- Northern LibertiesConverted industrial buildings, new townhouses and condos. Who owns the roof matters as much as what goes on it.
- Graduate HospitalRowhome blocks with Center City views and a newer historic district. Front setbacks and visibility are the questions to check.
- Point BreezeOlder rowhouses next to newer builds. Questions here are as often about repairing a deck as building one.
- Queen VillageSmall, old houses on narrow streets. Every roof deck here starts with logistics: how to get the materials up there.
- East Passyunk & Passyunk SquareClassic South Philly rowhomes, close together. Privacy screens and the neighbors’ views come up a lot here.
- Society HillA 1999 historic district with some of the city’s oldest houses. A deck here is possible, but visibility decides how hard it is.
- Rittenhouse & Fitler SquareTall townhouses in one of the city’s largest historic districts. Roof decks are common, but so are views from the squares.
- Spring Garden & FairmountGrand rowhouses near the Art Museum, a 2000 historic district, and newer construction in Brewerytown.
- ManayunkHillside rowhouses with river views. Wind, slope and the 48-inch rule shape decks here.
Thinking about a roof deck?
Tell us about the house. We’ll pass it to one independent Philadelphia builder for a free quote.