Permit
Local ordinance, not the state
The state code does not cover a reroof that changes no structure (34 Pa. Code § 403.1(b)(8)). So the township code office in Lower Gwynedd is the one to ask before work starts.
Source: 34 Pa. Code § 403.1(b)
Roof Replacement in Lower Gwynedd, PA
Half of the 5,100 homes in Lower Gwynedd were built before 1979. The rules below decide how much of the old roof has to come off and what goes under the new one.
New Roofing Costs connects homeowners with independent local roofing contractors. We do not perform roofing work.
Call (833) 781-1806 Replacement and new roofs only · homeowners
This number connects homeowners who are planning a new roof or a full roof replacement with independent local roofing contractors. It is not for leak repairs or patch jobs. The call must come from the homeowner who decides on the roof. Calls may be recorded.
The rules for a reroof in Lower Gwynedd
Layers
One old layer can stay; two cannot
A new roof may go over one existing layer; with two or more, or over slate, clay or cement tile, everything comes off to the deck (IRC R908.3.1.1). 52% of Lower Gwynedd’s homes were built before 1980, so count the layers before comparing quotes.
Ice barrier
Lower Gwynedd’s climate table decides
Whether an eave membrane is a code item depends on the climate table the municipality filled in when it adopted the code (IRC R905.1.2, Table R301.2). The contractor or the township code office in Lower Gwynedd will know.
Rules as read on October 24, 2026. Code edition, permit and contract rules for the whole state: roof replacement in Pennsylvania.
Homes and roofs in Lower Gwynedd
Owners live in 3,741 of Lower Gwynedd’s occupied homes, or 78%. By year built, 8% before 1940, 22% before 1960, 52% before 1980; 14% went up in 2000 or later. (ACS 2020–2024.)
By building type: 58% detached houses, 17% attached single-family houses (rowhouses, twins and townhouses), 5% buildings of two to four units.
Of the 61 Montgomery County municipalities on this site, Lower Gwynedd has the 37th largest share of homes built before 1980: 52%, against a county range of 17% to 98%.
ZIP codes: 19002 · 19436 · 19437 · 19477
Lower Gwynedd and the towns around it
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Lower Gwynedd | 1979 | 52% | 78% | 17% | 14 |
| Ambler | 1954 | 84% | 50% | 29% | 17 |
| North Wales | 1943 | 89% | 74% | 21% | 15 |
| Upper Gwynedd | 1983 | 44% | 74% | 21% | 16 |
| Whitpain | 1983 | 41% | 77% | 24% | 15 |
| Montgomery Township, Montgomery County | 1992 | 21% | 89% | 31% | 17 |
Median built: median year the homes were built. Before 1980: share of homes built then. Owners: share of homes that are owner-occupied. Row, twin: share of homes that are rowhouses, twins or townhouses. Census ACS 2020–2024. Hail days: days with hail of 1 inch or larger within 10 miles, 2006–2025, NOAA Storm Prediction Center.
Storm record around Lower Gwynedd
Within 10 miles of Lower Gwynedd, hail of an inch or more was reported on 14 days between 2006 and 2025, the biggest stones 1.25 in on July 21, 2021. The most recent was August 18, 2024.
Remnants of Hurricane Ida (DR-4618, September 2021) is the latest of 6 federal storm declarations covering Montgomery County since 2006. (OpenFEMA.)
A report says hail fell near Lower Gwynedd, not that it damaged a roof. When wind or hail damage means a new roof.
What goes on the roof next
HUD’s useful-life figures are for planning; a warranty is a separate promise. For Lower Gwynedd’s houses: More in the guides to shingles, metal, slate and flat roofs.
| Material | HUD useful life | Fits a house like | Watch for |
|---|---|---|---|
| Asphalt shingles | 20 years | Most pitched roofs; 58% of homes here are detached | Wind class set by the design wind speed (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Simple roofs with long, unbroken slopes | Standing seam that carries its own loads can skip the tear-off (R908.3.1) |
| Slate | 75 years | Older houses; 8% here predate 1940 | Sound slate can be reused (R908.5); broken slate cannot |
| Flat roof: EPDM or TPO | 15 years | Low-slope roofs and rear sections (17% of homes here are attached) | Where the roof meets a wall or parapet |
Checking a contractor in Pennsylvania
A contractor who does $5,000 or more of home improvement work a year must be registered with the Pennsylvania Attorney General, and the number has to be on every contract and estimate (HICPA § 3, § 6). Ask for it before anyone starts on a roof in Lower Gwynedd, and search it.
The price side is in what a new roof costs in Pennsylvania; the paperwork side in checking a roofing contractor.
Questions about a new roof in Lower Gwynedd
Do I need a permit to replace a roof in Lower Gwynedd?
Local ordinance, not the state. The state code does not cover a reroof that changes no structure (34 Pa. Code § 403.1(b)(8)). So the township code office in Lower Gwynedd is the one to ask before work starts.
Do the old shingles have to come off in Lower Gwynedd?
A new roof may go over one existing layer; with two or more, or over slate, clay or cement tile, everything comes off to the deck (IRC R908.3.1.1). 52% of Lower Gwynedd’s homes were built before 1980, so count the layers before comparing quotes.
How old are the houses in Lower Gwynedd?
By the Census Bureau’s American Community Survey (2020–2024), the median home in Lower Gwynedd was built in 1979, 52% of homes were built before 1980, 78% are owner-occupied.
How often does hail hit Lower Gwynedd?
Hail of 1 inch or larger was reported on 14 days within 10 miles of Lower Gwynedd from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
How do I check a roofing contractor in Lower Gwynedd?
A contractor who does $5,000 or more of home improvement work a year must be registered with the Pennsylvania Attorney General, and the number has to be on every contract and estimate (HICPA § 3, § 6). Ask for it before anyone starts on a roof in Lower Gwynedd, and search it.
What they will ask on the phone
- The street address in Lower Gwynedd, or at least the ZIP code
- The number of stories, and whether the house stands alone
- What covers the roof now and about when it went on
- Whether there is one layer or more, if you know
- That you want a new roof or a full replacement, and when you want the work done
- Any historic-district or HOA rules on the house in Lower Gwynedd
- That you are the owner and the one who decides
The full list: before you call.