The AhTown Guide to Roofing in New Jersey

What does a roof cost in NJ?

National prices by home size

Angi (March 2026) puts the national average at $9,609.

What is a “square”?

Roofers price by the square: 100 square feet of roof. A 2,000 square foot roof is 20 squares. Your roof is larger than your floor plan because of the pitch and overhangs.

What changes the price?

• Material: see roofing materials compared
• Pitch and complexity: steep roofs, dormers, valleys and skylights
• Tear-off: how many layers come off
• Decking: rotted plywood found after tear-off is priced per sheet. Ask for that price up front
• Flashing, vents and gutters

Sloped roofs

A square is 100 square feet. $400 to $600 per square is $4 to $6 per square foot.

Flat and low-slope roofs

Which should you choose?

• Staying under 15 years: architectural asphalt is usually the best value
• Staying for decades: metal costs about twice as much and can last twice as long
• Slate already on the house: it can last a century or more, so get a repair quote before replacing it

Common repairs

Where do roofs usually leak?

Around things that poke through: chimneys, vent pipes and skylights. The roofing trade association NRCA tells homeowners to look for loose material or wear around chimneys, pipes and other penetrations.

What should you do when the roof is leaking?

1. Catch the water and move what you can.
2. Take photos for your insurer.
3. Call a roofer for an emergency tarp if the weather won't let them repair it.
4. Call your insurance company if a storm caused it. See insurance and roofs.

Stay off the roof. NRCA discourages homeowners from climbing up to inspect.

Does a roof repair need a permit in NJ?

Not on a detached one- or two-family house. See roof permits.

How long each roof lasts

Signs from the ground

The National Roofing Contractors Association says to look for:

• Shingles that are buckling, curling or blistering. That signals the end of their life
• Loose material or wear around chimneys, pipes and other openings
• Excessive shingle granules in the gutters

Check from the ground with binoculars, or from a window. Don't climb up.

What does a roof inspection cost?

HomeAdvisor's most recent figure is an average of $236, with a range of $125 to $358. Fixr's New Jersey page lists $400 to $1,000. Many roofers inspect for free when quoting, which is useful but comes from someone selling a roof.

How often should a roof be checked?

Twice a year, in spring and fall, and after any major storm.

Repair or replace?

These are rules of thumb. A roofer who inspects the roof should be able to show you photos of what they found.

Can you put new shingles over old ones in NJ?

Sometimes. New Jersey's rehabilitation code requires removing the existing roof covering before installing a new one when:

• There are already two or more layers of roofing
• The existing roof is water-soaked or deteriorated
• The existing roof is slate, tile or wood shake

So one new layer over a single sound layer of asphalt shingles is allowed.

Should you?

A second layer saves the tear-off cost, about $1 per square foot. But it hides the plywood, so rotted decking doesn't get found or fixed. A full tear-off lets the roofer inspect the deck. Ask how each option affects the shingle warranty.

What does the NJ rule say?

New Jersey's construction code (N.J.A.C. 5:23-2.7) lists as ordinary maintenance:

• The repair or replacement of existing roof covering on detached one- and two-family dwellings
• The repair, replacement or installation of gutters and leaders

The state's 2018 notice says this includes total replacement of any amount of roof covering.

When do you still need a permit?

What should you ask your roofer?

• Does my house qualify as a detached one- or two-family dwelling?
• If you find rotted decking, does that change the permit answer in my town?

NJ rules bar a contractor from starting work until any required permits have been issued. “No permit needed” should come with a reason.

What does NJ require of a roofer?

• Registration with NJ Consumer Affairs. The number begins “13VH”
• Insurance: at least $500,000 per occurrence in commercial general liability, plus workers' compensation unless exempt
• A compliance bond of $10,000 to $50,000, depending on the size of their contracts, under the 2024 law
• The registration number on all ads, contracts, business documents and commercial vehicles

What must the contract include?

For any job over $500, a written contract with:

• The contractor's legal name, business address and registration number
• A copy of their liability insurance certificate and the insurer's phone number
• A description of the work and the main materials
• The total price, including any finance charges
• Start and completion dates
• Any warranties, in writing

You can cancel until midnight of the third business day after you receive a copy.

Is NJ licensing roofers now?

It's being phased in. A law signed in January 2024 created a state board and will require new contractors to pass an exam and show training or experience. Sources from mid-2026 say the licensing part was not yet operating, and New Jersey was still a registration state. Ask NJ Consumer Affairs for the current status: 800-242-5846.

How do you check a roofer?

Search at newjersey.mylicense.com/verification, or call 800-242-5846. Confirm the registration is active and the name matches your contract.

Covered or not?

Policies differ. Read yours.

Replacement cost vs. actual cash value

A 20-year-old roof on an ACV policy may pay out very little. Wind and hail deductibles can be a flat amount or a percentage of your home's insured value.

Should you hire a public adjuster?

You can. In New Jersey, public adjusters are licensed by the Department of Banking and Insurance. The department says fees are generally 10 to 15% of the claim, and the contract must list the services and the maximum fee. They may not solicit you between 6 p.m. and 8 a.m. in the 24 hours after a loss.

What should you watch for?

• Report the damage right away. Many policies give only one year to sue over a denied claim
• Don't sign anything that hands a contractor the rights to your insurance claim
• Be wary of a roofer who offers to “cover” your deductible. Your insurer's payment assumes you pay it

Warning signs

From the FTC and the Better Business Bureau:

• They knock on your door because they're “working in the area”
• They say they have materials left over from another job
• They pressure you to decide immediately
• They want full payment or a very large deposit before starting
• They accept only cash
• They ask you to pull the permit
• They want you to sign documents giving them rights to your insurance claim

What has NJ warned about?

After Hurricane Sandy, NJ Consumer Affairs warned that fly-by-night, unregistered contractors would descend on storm-damaged areas. After 2018 flooding, the Attorney General told homeowners to be wary of large upfront payments or demands for cash, and to get at least three written estimates.

How do you protect yourself?

1. Look up the registration at newjersey.mylicense.com/verification.
2. Get a written contract. NJ requires one for jobs over $500.
3. Use your three business days to cancel if you signed under pressure.
4. Pay in stages. NJ Consumer Affairs suggests no more than one-third up front.
5. Pay by check or card, never cash.

Is a “free roof” real?

No. A roof paid for by insurance still involves your deductible. An offer to waive it should make you cautious.

How long by material

Rain, rotted decking and a steep or complicated roof add time.

When is the best time of year in NJ?

Fall, with mild temperatures and dry stretches. Late spring and summer work too. Book ahead.

Can a roof be replaced in winter?

Yes, with care. GAF and Owens Corning both treat 40°F as the cold-weather line:

• Below 40°F, shingles lose flexibility and can crack
• The adhesive strip needs warmth and sun to activate
• In cold weather, roofers hand-seal each shingle with dabs of roofing cement

Ask a winter installer whether they hand-seal, and whether the manufacturer's warranty still applies.

What should you expect on the day?

• Noise from early morning
• A dumpster in the driveway
• Tarps over landscaping
• A magnet sweep for nails at the end. Ask for it in the contract

Why do ice dams form?

The University of Minnesota Extension puts it simply: uneven roof surface temperatures cause ice dams. Warm air from the house heats the upper roof, snow melts, and the water freezes when it reaches the unheated overhang. Water backs up behind the ice and gets under the shingles.

How do you prevent them?

1. Seal the ceiling. Stop warm, moist air from leaking into the attic around lights, hatches and pipes.
2. Add attic insulation after the leaks are sealed.
3. Rake snow off the lower roof from the ground after heavy storms.

Does NJ code require ice and water shield?

Only in the coldest part of the state. New Jersey requires an ice barrier where the average daily January temperature is 25°F or less, and a state bulletin says that applies only to Sussex County. Elsewhere it's good practice, not code. Ask whether your quote includes it at the eaves and valleys.

What does removal cost?

Don't chip at ice with a hammer or shovel. It damages shingles.

The two warranties

What does “lifetime” mean?

Less than it sounds. Using GAF's 2026 warranty chart as an example:

The enhanced levels require a contractor with GAF's own credential.

What voids a roof warranty?

The trade association NRCA says to read the warranty for what voids it. Common issues to ask about: installing over old shingles, poor attic ventilation, and work by another contractor later.

What does NJ require?

New Jersey's home improvement rules require contractors to give you copies of all warranties in writing. Get both the manufacturer's document and the roofer's own workmanship terms before you sign.

What should you ask?

• How many years is your workmanship warranty, and what does it cover?
• Which manufacturer warranty level is in this quote?
• Will you register the warranty, and will I get the certificate?
• Does it transfer if I sell the house?

Installation cost by material

Seamless gutters add $3 to $5 a foot. Downspouts run $30 to $75 each.

Gutter cleaning

Clean at least twice a year, in late spring and after the leaves fall. More often under heavy tree cover.

Should you replace gutters with the roof?

If they're old, yes. The roofer is already working at the edge of the roof, and new drip edge and flashing tie into the gutters.

Does it need a permit?

No. New Jersey lists the repair, replacement or installation of gutters and leaders as ordinary maintenance.

Why the roof's age matters

Panels sit on the roof for decades. An architectural shingle roof lasts about 30 years, so a 15-year-old roof will need replacing while the panels still have half their life left.

What does it cost to remove and reinstall panels?

It takes 1 to 2 days to take the panels off and 2 to 3 days to put them back.

What should you do?

What should you ask?

• The solar company: who pays to remove and reinstall the panels if the roof needs work? Does that void anything?
• The roofer: does mounting solar affect the shingle warranty?

Your options

Why not just replace it?

A new roof costs most New Jersey homeowners $8,500 to $17,000, according to Fixr's 2026 data, and the Cost vs Value estimate says you get back roughly half. A buyer's inspector will flag an old roof either way. A replacement quote in hand lets you negotiate with real numbers instead of the buyer's guess.

How old is too old?

InterNACHI puts an architectural asphalt shingle roof at about 30 years and a basic 3-tab roof at about 20. Curling, buckling or blistering shingles and lots of granules in the gutters are signs it's near the end. See signs you need a new roof.

What should you do before listing?

• Clear the gutters and downspouts. Cleaning averages about $360
• Replace missing or damaged shingles
• Fix flashing at chimneys and vents
• Gather the roof's age, permit, warranty and any repair invoices
• Disclose past leaks on New Jersey's seller disclosure form

Does a new roof transfer its warranty?

Ask. Some manufacturer warranties transfer once to a new owner. See roof warranties.

More on getting ready to sell

See The AhTown Guide to Getting Your New Jersey Home Ready to Sell.

Is the price reasonable?

Only if the quotes cover the same job. A cheap quote often leaves things out. Ask every roofer to answer these in writing:

See what a new roof costs and repair costs.

What does “guaranteed work” actually mean?

A “lifetime” shingle warranty can mean full coverage for only the first 10 years and no workmanship coverage at all. Ask how many years the roofer's own warranty runs, what it covers, and whether you get it in writing. New Jersey requires contractors to give you copies of all warranties. See roof warranties.

What should you ask a neighbor who recommends a roofer?

A recommendation tells you the crew showed up. Ask the questions that tell you about the guarantee:

• Did you get a written workmanship warranty? For how many years?
• Did anything leak afterward, and did they come back?
• Did the final bill match the quote?

What should you check before you sign?

• The registration number starts with “13VH.” Look it up at newjersey.mylicense.com/verification. See checking a roofer
• A certificate of liability insurance
• A written contract for any job over $500, with start and finish dates. You have three business days to cancel
• A payment schedule. NJ Consumer Affairs suggests a third up front, a third midway and a third at completion

Red flags

A knock on the door after a storm, “we're in the area,” pressure to sign today, or a large cash deposit. See storm chasers.

Ten questions to ask

1. What's your NJ registration number? (It begins “13VH.”)
2. Can you send certificates for liability insurance and workers' comp?
3. Do you have a permanent place of business? How long have you been there?
4. Is this a full tear-off? How many layers are there now?
5. What do you charge per sheet if you find rotted decking?
6. What underlayment and flashing are you installing? Is ice and water shield included?
7. Who supervises the crew on site?
8. Which manufacturer warranty comes with this, and what's your workmanship warranty?
9. Will you protect the landscaping and do a magnet sweep for nails?
10. What's the payment schedule?

What should the written proposal include?

From NRCA: complete descriptions of the work and specifications, start and completion dates, and payment procedures. New Jersey law adds the registration number, a copy of the insurance certificate, and your three-day right to cancel.

Is the lowest bid the best?

Not automatically. NRCA says price is only one factor. Compare what each bid includes: tear-off, underlayment, flashing, ventilation, cleanup and warranty.

Red flags

• They knocked on your door after a storm
• No “13VH” number
• A large deposit or cash only
• They want you to sign over your insurance claim

See roofing scams.

Where do you find one?

AhTown features one company per trade per ZIP code in New Jersey. Roofing listings are opening soon. Featured Pros pay for placement. AhTown does not endorse, verify or guarantee any provider, so run the registration check above for any roofer you call. See who's featured in your ZIP.