Permit
Expect a building permit
Roofing is not on the Massachusetts list of work exempt from a permit (780 CMR 51.00, R105.2). Dennis’s building department issues it, and the application carries the contractor’s HIC registration number.
Roof Replacement in Dennis, MA
Half of the 15,381 homes in Dennis were built before 1970. 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 Dennis
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). 73% of Dennis’s homes were built before 1980, so count the layers before comparing quotes.
Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 780 CMR 51.00, Chapter 9 amendments
Ice barrier
Required in Dennis
The state’s climate table marks the ice barrier “yes” statewide. That is a self-adhering membrane, or two cemented layers of underlayment, from the eave to at least 24 inches inside the wall line (IRC R905.1.2).
Source: 780 CMR 51.00, Chapter 3 amendments (Tables R301.2(1) and R301.2(2)); IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes)
Wind and snow
130 mph design wind, 30 psf ground snow
Dennis’s code design values are a 130 mph ultimate design wind speed and a 30 psf ground snow load (25 psf minimum flat-roof snow load); the town is in the windborne debris region. At that wind speed the code calls for asphalt shingles labeled ASTM D7158 Class G or H (Table R905.2.4.1).
Source: 780 CMR 51.00, Chapter 3 amendments (Tables R301.2(1) and R301.2(2)); IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes) (780 CMR 51.00, Table R301.2(2))
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in Massachusetts.
Homes and roofs in Dennis
Owners live in 5,763 of Dennis’s occupied homes, or 79%. Counting by decade, 11% before 1940, 32% before 1960, 73% before 1980 of the housing was in place, and 7% dates from 2000 on. (ACS 2020–2024.)
The housing is 83% detached houses, 5% attached single-family houses (rowhouses, twins and townhouses).
52% of the homes in Dennis are seasonal or occasional-use homes (ACS 2020–2024). If yours is one of them and you live elsewhere, the call still has to come from you as the owner.
Of the 15 Barnstable County municipalities on this site, Dennis has the largest share of homes built before 1980: 73%, against a county range of 25% to 73%.
ZIP codes: 02638 · 02639 · 02641 · 02660 · 02670
Dennis and the towns around it
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Dennis | 1970 | 73% | 79% | 5% | 3 |
| Yarmouth | 1974 | 68% | 82% | 6% | 3 |
| Harwich | 1976 | 55% | 85% | 3% | 1 |
| Brewster | 1983 | 42% | 85% | 7% | 1 |
| Barnstable | 1978 | 55% | 76% | 4% | 3 |
| Orleans | 1979 | 53% | 81% | 4% | 2 |
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.
Hail and storms near Dennis
Within 10 miles of Dennis, hail of an inch or more was reported on 3 days between 2006 and 2025, the biggest stones 1.5 in on July 2, 2009. The most recent was August 7, 2014.
That is fewer than most places in the state on this site (median 10 days).
At the county level, Dennis shares Barnstable County’s record of 6 storm disaster declarations since 2006, the newest DR-4372 (Severe Winter Storm and Flooding, June 2018). (OpenFEMA.)
Storm reports are what observers logged, not a measure of damage to any roof. When wind or hail damage means a new roof.
What goes on the roof next
Useful life is HUD’s planning figure, not a warranty. 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; 83% of homes here are detached | Class G or H at 130 mph design wind (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Roofs that will carry solar later | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older houses; 11% here predate 1940 | Can’t be roofed over; check the framing for the weight |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Coating is not a replacement |
Checking a contractor in Massachusetts
In Dennis the contractor’s HIC registration (M.G.L. c. 142A) and the CSL of the supervisor licensed for roof covering are the two numbers to look up before signing.
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Massachusetts.
Questions about a new roof in Dennis
Do I need a permit to replace a roof in Dennis?
Expect a building permit. Roofing is not on the Massachusetts list of work exempt from a permit (780 CMR 51.00, R105.2). Dennis’s building department issues it, and the application carries the contractor’s HIC registration number.
Can a new roof go over the old one in Dennis?
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). 73% of Dennis’s homes were built before 1980, so count the layers before comparing quotes.
When were most homes in Dennis built?
By the Census Bureau’s American Community Survey (2020–2024), the median home in Dennis was built in 1970, 73% of homes were built before 1980, 79% are owner-occupied.
How often does hail hit Dennis?
Hail of 1 inch or larger was reported on 3 days within 10 miles of Dennis from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
What license or registration should a roofer in Dennis have?
In Dennis the contractor’s HIC registration (M.G.L. c. 142A) and the CSL of the supervisor licensed for roof covering are the two numbers to look up before signing.
What they will ask on the phone
- The street address in Dennis, or at least the ZIP code
- The number of stories, and whether the house stands alone
- What is on the roof now (asphalt shingles, metal, slate, tile, or a flat membrane) and roughly how old it is
- How many layers are on it, if you know
- Your timing for a complete replacement
- Whether the house is in a historic district or an HOA
- That you are the owner and the one who decides
The full list: before you call.