Roof replacement, leak repair and storm damage for homes in Portland. In Portland, the 2021 IRC is in force and 46% of the 36,559 homes went up before 1940. It starts with a free inspection that photographs every slope.
Portland runs to about 21.5 square miles and roughly 68,854 people. The community dates back to 1786. We cover the 041xx ZIP codes across the town.
On a historically designated property in Portland, any exterior change visible from a public way needs historic preservation approval before work starts, and the city's list of work that needs it includes installing or replacing visible roofing. Ordinary maintenance that changes nothing about the design, material or look, such as replacing a roof in kind, is exempt, as is work not readily visible from the street. Most projects are approved by staff, typically in 10 to 15 business days; larger ones go to the Historic Preservation Board. The city's districts include the West End, Munjoy Hill, India Street, Stroudwater, the Waterfront, Deering Street, Congress Street and Fort McKinley.
No completed roof in Portland is logged in our job records yet.
We work across Portland rather than one corner of it — Munjoy Hill, West End, Old Port, East End, Deering Center, Bayside, Parkside, Stroudwater, North Deering and Peaks Island included. Age and construction change between them, which is why we look before we quote.
Maine's largest city sits on a peninsula in Casco Bay, and its limits take in Peaks, Great Diamond, Little Diamond, Cushing and Cliff islands. Casco Bay Lines ferries run year-round to the populated islands, with an auto ferry to Peaks Island for most of the schedule. The Great Fire of July 4, 1866 destroyed most of the downtown commercial buildings and hundreds of homes, and much of the old city now lies in historic districts such as the Western Promenade, Stroudwater and the Portland Waterfront.
Houses of this age in Portland were sheathed with solid board decking rather than plywood, and boards move. Plank gaps open up, nails back out, and a shingle fastened into a gap has nothing holding it. We also expect original step and counter-flashing at chimneys and walls — often the real leak while the shingles look fine — and more than one house on a street like this has two or three roofs stacked on it because someone went over rather than tore off. That matters: layers hide the decking, add weight, and void most manufacturer warranties. If there is original slate or tile anywhere on the property, it wants a different conversation than an asphalt tear-off.
Portland has 36,559 homes in the Census Bureau's count and a median year built of 1946. 16,740 of them (46%) went up before 1940 — the 2nd-highest pre-1940 share of the 64 places on this site — and 4,023 (11%) in 2000 or later. More of today's homes date from before 1940 than from any decade since. That is above Cumberland County's 23%.
About 25 years is the usual useful life of a roof, by the figure in the Maine Bureau of Insurance's claims guide. That puts 32,536 homes in Portland, the 89% built before 2000, past at least one full roof life; 24,977 of them (68%) predate 1970, old enough for two replacements already. Homes from the 2000s (1,950 in Portland) are reaching their first replacement, while the 2,073 built since 2010 are mostly still on the roof they were built with. Older houses are where a second layer laid over the first turns up, and that layer is what hides soft decking.
By building type: 13,155 detached houses (36%), 1,680 attached (5%). 13,736 homes (38%) sit in two- to nine-unit buildings and 7,901 (22%) in buildings of ten units or more, whose roofs are normally an owner's or a board's call rather than a resident's. The count also takes in 87 mobile homes, which are a different kind of roof job. Owners live in 47% of the 32,965 occupied homes. On a housing mix like this, the likely work is full tear-offs on houses past two roof lives, deck and flashing checks on pre-war board sheathing and flat and low-slope sections, which turn up more on attached and multi-unit buildings.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 16,740 | 46% | |
| 1940s | 2,440 | 7% | |
| 1950s | 2,948 | 8% | |
| 1960s | 2,849 | 8% | |
| 1970s | 2,969 | 8% | |
| 1980s | 3,215 | 9% | |
| 1990s | 1,375 | 4% | |
| 2000s | 1,950 | 5% | |
| 2010s | 1,739 | 5% | |
| 2020 or later | 334 | 1% |
Census ACS 2020–2024, tables B25034, B25035, B25024 and B25003: 36,559 homes, 32,965 occupied. Survey estimates.
NOAA’s Storm Prediction Center logged no reports of hail 1 inch or larger within 5 miles of Portland’s center from 2016 through 2025. That is a gap in the reports rather than proof that no hail fell: reports come from spotters and the public.
The City lists re-roofing among work that does not need a building permit. Its building permit FAQ says re-shingling a roof needs no building permit as long as no structural changes are made. Re-roofing that includes structural changes needs a building permit. In a historic district or on a historic landmark, exterior roof work can still need a building permit review and/or historic preservation approval.
Portland enforces the 2021 IRC. That is the Maine Uniform Building and Energy Code (MUBEC), whose current version, in force since April 7, 2025, uses the 2021 International Residential Code, 2021 International Building Code, 2021 International Existing Building Code, 2021 International Energy Conservation Code and 2021 International Mechanical Code, with Maine amendments. By referendum, Portland also adopted the MUBEC stretch energy code (MUBEC Chapter 7, Appendix NA). Local building rules are in Chapter 6 of the City Code.
The published number is 207-874-8703. The Permitting and Inspections Department administers and enforces the building, life safety, electrical and plumbing codes, and answers email at permitting@portlandmaine.gov. The department page is here.
The design wind speed a roof in Portland is built to depends on where the house stands: across greater Portland and southern Maine the published ultimate design wind speeds run 115–120 mph. Ground snow load is set for each address, not one figure for the whole area: the published figures here run 50–70 psf. The building department can confirm the figure, and the code guide explains what it governs.
Portland borders South Portland, Westbrook, Falmouth, Cape Elizabeth, Long Island and Chebeague Island. Our pages for them:
Also in Cumberland County:
| Town | Re-roof permit | Code | Median built |
|---|---|---|---|
| Portland | No | 2021 IRC | 1946 |
| South Portland | Not published | 2021 IRC | 1968 |
| Westbrook | Not published | 2021 IRC | 1975 |
| Falmouth | Not published | 2021 IRC | 1986 |
| Cape Elizabeth | No | 2021 IRC | 1967 |
| Baldwin | Not published | Enforcement optional | 1979 |
| Bridgton | No | 2021 IRC | 1985 |
All 25 Cumberland County towns side by side →
The City lists re-roofing among work that does not need a building permit. Its building permit FAQ says re-shingling a roof needs no building permit as long as no structural changes are made. Re-roofing that includes structural changes needs a building permit. In a historic district or on a historic landmark, exterior roof work can still need a building permit review and/or historic preservation approval.
Portland enforces the 2021 IRC. That is the Maine Uniform Building and Energy Code (MUBEC), whose current version, in force since April 7, 2025, uses the 2021 International Residential Code, 2021 International Building Code, 2021 International Existing Building Code, 2021 International Energy Conservation Code and 2021 International Mechanical Code, with Maine amendments. By referendum, Portland also adopted the MUBEC stretch energy code (MUBEC Chapter 7, Appendix NA). Local building rules are in Chapter 6 of the City Code.
The Census Bureau's 2020–2024 estimates put the median year built at 1946: 46% of Portland's 36,559 homes predate 1940 and 11% were built in 2000 or later. At the usual 25-year roof life, 89% have needed at least one new roof already.
It can. Portland has Portland Waterfront Historic District, Western Promenade Historic District, Spring Street Historic District and Deering Street Historic District. Inside a designated district, changing a visible roof material or color can need preservation review before the permit is issued. Like-for-like replacement usually raises fewer questions, but we check before quoting.
Not yet: no completed roof in Portland is in our job records, so this page shows no job count.
Researched 2026-10-24; housing, Census ACS 2020–2024; hail, NOAA SPC. Sources: content.civicplus.com · www.portlandmaine.gov · www.portlandmaine.gov · content.civicplus.com · content.civicplus.com · content.civicplus.com · www.portlandmaine.gov · www.portlandmaine.gov · content.civicplus.com · www.portlandmaine.gov · en.wikipedia.org · en.wikipedia.org · en.wikipedia.org · en.wikipedia.org · www.zip-codes.com · tigerweb.geo.census.gov · data.census.gov · www.spc.noaa.gov. Rules and staff change; check with the jurisdiction.
