Roof Replacement in Chelmsford, MA

Chelmsford has 13,942 homes, and half of them were standing by 1967. Below: what the code asks of a replacement here, the permit, and the town’s own records.

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.

A Massachusetts Cape Cod house with a new shingle roof after light snow

The rules for a reroof in Chelmsford

Permit

Expect a building permit

Roofing is not on the Massachusetts list of work exempt from a permit (780 CMR 51.00, R105.2). Chelmsford’s building department issues it, and the application carries the contractor’s HIC registration number.

Source: 780 CMR 51.00, Chapter 1 amendments (R105)

Layers

Two layers means a tear-off

On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). 68% of Chelmsford’s homes were built before 1980; many have been reroofed before.

Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 780 CMR 51.00, Chapter 9 amendments

Ice barrier

Required in Chelmsford

Massachusetts answers “yes” to the ice barrier for every town. It runs from the eave to 24 inches inside the exterior wall, more on steep roofs (IRC R905.1.2); check that the quote lists it.

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

117 mph design wind, 50 psf ground snow

Chelmsford’s code design values are a 117 mph ultimate design wind speed and a 50 psf ground snow load (30 psf minimum flat-roof snow load). 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 Chelmsford

Owners live in 11,049 of Chelmsford’s occupied homes, or 82%. Counting by decade, 15% before 1940, 32% before 1960, 68% before 1980 of the housing was in place, and 13% dates from 2000 on. (ACS 2020–2024.)

The housing is 67% detached houses, 8% attached single-family houses (rowhouses, twins and townhouses).

Of the 54 Middlesex County municipalities on this site, Chelmsford has the 22nd largest share of homes built before 1980: 68%, against a county range of 29% to 87%.

ZIP codes: 01824 · 01863

Chelmsford and the towns around it

Place	Median built	Before 1980	Owners	Row, twin	Hail days
Chelmsford	1967	68%	82%	8%	11
Westford	1983	45%	86%	8%	11
Lowell	1953	75%	43%	7%	13
Carlisle	1976	58%	94%	1%	7
Tyngsborough	1987	29%	86%	12%	19
Billerica	1973	62%	79%	6%	10

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 Chelmsford

Since 2006 the National Weather Service has logged hail of 1 inch or larger on 11 separate days within 10 miles of Chelmsford; the largest was 2 in on August 4, 2015. The most recent was June 6, 2025.

At the county level, Chelmsford shares Middlesex County’s record of 8 storm disaster declarations since 2006, the newest DR-4379 (Severe Winter Storm and Snowstorm, July 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

HUD’s useful-life figures are for planning; a warranty is a separate promise. For Chelmsford’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; 67% of homes here are detached	Class G or H at 117 mph design wind (IRC Table R905.2.4.1)
Metal (standing seam, panels)	50 years	Low pitches and long runs	A complete standing-seam system may go over the old roof (R908.3.1)
Slate	75 years	Older houses; 15% 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 Chelmsford 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 Chelmsford

Do I need a permit to replace a roof in Chelmsford?

Expect a building permit. Roofing is not on the Massachusetts list of work exempt from a permit (780 CMR 51.00, R105.2). Chelmsford’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 Chelmsford?

When were most homes in Chelmsford built?

By the Census Bureau’s American Community Survey (2020–2024), the median home in Chelmsford was built in 1967, 68% of homes were built before 1980, 82% are owner-occupied.

How often does hail hit Chelmsford?

Hail of 1 inch or larger was reported on 11 days within 10 miles of Chelmsford 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 Chelmsford have?