Call (201) 397-0232
4.8 · 106 Google reviewsRoof repair & replacement in Mercer County, NJ
Imperial Roof Repair & Replacement repairs and replaces roofs in all 12 Mercer County towns, from flat roofs on Trenton rowhouses to slate repairs and shingle roofs in Hamilton, Princeton and West Windsor. Our crew is based in Elmwood Park, about 59 miles from Trenton, so jobs are scheduled ahead, and every one starts with a free written estimate.
4.9(143 reviews)
GAF Master Elite®
Contractor
Licensed & insuredNJ HIC #13VH09329100
Free written estimate
We inspect, photograph the problem areas and give you an itemized price. No cost, no obligation.
GAF Master Elite contractor
GAF’s highest residential certification. It lets us offer GAF’s extended system warranties on qualifying roofs.
24/7 emergency line
Call any time, day or night. We stop the water first, then plan the proper repair.
Photo & drone inspections
You see every problem we find, on the ground or from the air, before you decide.
Mercer County roofs
What to know about roofs in Mercer County
Mercer County puts very different houses side by side. Trenton's older neighbourhoods are built of 19th-century brick rowhouses, Princeton has a National Register historic district with buildings from the 1700s, and the surrounding townships are mostly newer. Census data put the county's median year built at 1972, with 34% of homes built before 1960 and 17% before 1940. Only 48% of homes are single-family detached, so attached houses and shared walls are part of many roof jobs here. That mix means there is no single right answer for a Mercer County roof: the material, the details and even who needs to sign off depend on which kind of house you live in.
Trenton rowhouses and low-slope roofs
The National Register nomination for Trenton’s Mill Hill Historic District counted 284 structures, 263 of them rowhouse types, mostly brick and built in the middle to late 1800s, many finished with bracketed cornices along the street. Rowhouses like these usually have a low-slope roof behind the cornice that drains toward the back, with party walls shared with the houses on either side. Low-slope roofs of this age are often patched again and again with tar and coatings, until nobody knows what is underneath.
Shingles do not belong on a roof that flat. On a rowhouse we install a membrane such as EPDM or torch-down modified bitumen, rebuild the flashing at parapets and chimneys, and make sure water runs to the rear gutter or drain instead of ponding. The joint with the neighbour’s roof at the party wall is where most rowhouse leaks start, so we check that seam and tell you what we see on the other side before we quote. If the old roof has several layers of patching, we strip it to the deck, replace rotted boards and start clean rather than add another layer that will trap water. Brick parapets and cornices also need attention: loose coping and open mortar joints let water into the wall below the roof line, and a new membrane will not stop that leak.
Historic districts in Princeton and Trenton
Princeton has about 20 locally designated historic districts, and its Historic Preservation Commission reviews applications for work in them. The Princeton Historic District on the National Register covers several hundred buildings, among them Bainbridge House on Nassau Street, built in 1766. Trenton has eight designated historic districts, six of them residential, and the city’s Landmarks Commission reviews exterior alterations to buildings in those districts. Houses this old can have details that a standard shingle job does not account for, such as board sheathing, built-in gutters and decorative cornices.
If your house is in one of these districts, check with the town before you change the roofing material or colour; that review is separate from a building permit. Where an older house still has its slate, repair is often the better answer than replacement: we replace broken slates one by one, re-flash valleys and chimneys in copper, and leave sound slate on the roof. Walking on slate breaks it, so we work from ladders, hooks and roof brackets rather than standing on the field of the roof. If a slate roof has reached the end of its life, we explain the options in writing so you can take them to the town before anything is ordered.
Shingle roofs in the suburban townships
Most Mercer homes are newer than Trenton’s rowhouses: with a median year built of 1972, the typical house in townships such as Hamilton, Ewing, Lawrence, West Windsor, Hopewell and Robbinsville has an asphalt shingle roof over a plywood deck. These roofs fail in predictable places: worn pipe boots, lifted shingles at the ridge and rakes, and step flashing where a roof meets a wall or a second-storey addition. Low-slope sections over porches, sunrooms and family-room additions are another common source of leaks when they were shingled at a pitch too shallow for shingles to shed water.
When a shingle roof is due, we tear off to the deck, replace any soft decking, run ice & water shield along the eaves and in the valleys, and install a GAF or Owens Corning shingle system. We also check the attic: a balanced ridge vent and soffit intake keeps the attic drier in winter and helps the new shingles last. Where an addition has a low-slope section, we switch to a flat-roof membrane on that part and tie it into the shingles with proper flashing, so the two roofs work as one. You get a written estimate that lists each of these items, so you can compare quotes line by line.
How we schedule Mercer County work
Our crew is based in Elmwood Park, Bergen County, about 59 miles in a straight line from Trenton. We are not around the corner, so we schedule Mercer County jobs ahead and come with the crew and materials the job needs, instead of promising a quick drop-in. Estimates are free and written, with the scope, materials and price spelled out. For a replacement, we plan the tear-off so the roof is never left open overnight, tarp the house and landscaping, and run a magnet sweep for nails before we leave; on a rowhouse block we also protect the neighbours’ roofs and walkways.
For an active leak, call (201) 397-0232 at any hour. The line is answered 24/7, and we book the first available visit. Until then, move what you can away from the drip, catch the water and stay off a wet roof. Each town’s construction office decides what needs a permit; when your job needs one, we file it.
What we do
Roofing services in Mercer County
The services Mercer County homes ask for most, from rowhouse flat roofs to slate.
Roof repair
Leaks, missing shingles, flashing and pipe boots, traced to the source and fixed with matching materials.
Learn more
Roof replacement
Full tear-off to the deck, new decking where needed and a GAF or Owens Corning shingle system.
Learn moreEPDM flat roofing
Rubber membrane roofs for rowhouses, porches and additions, with new flashing at parapets and chimneys.
Learn moreSlate roof repair
Broken slates, copper flashing and valleys repaired by hand, keeping the sound slate on the roof.
Learn more
Our work
Roofs we’ve finished in New Jersey
Flat & commercialWarehouse roof, down to the deck
Flat & commercialNew membrane going down in sections
Roof replacementNew shingles on a brick colonial
Flat & commercialCommercial re-roof from above
Flat & commercialInsulation boards fastened before the membrane
How it works
How a project with Imperial works
Free inspection
A roofer checks every slope, photographs what needs attention and explains it on the spot. No sales pitch.
Price in writing
An itemized price in writing. Approve it and we put your job on the schedule.
Installed and site cleaned
Tarps over your landscaping, a magnet sweep for nails and all debris hauled off the same day.
4.8 out of 5Based on 106 Google Reviews4.8 out of 5 · 106 Google reviews
106 Google and 143 HomeAdvisor reviews from North Jersey homeowners
“Quickly got a quote and started the job promptly. He saw some other small issues on the roof that he took care of while completing the job. Very quick and professional.”
Dharmdeo S.Google reviewShingle roof repair
“It was a small job but is done as carefully and everything looks uniform. Thank you Erick”
Christine L.Google reviewRoof repair
“I had been getting water in my ceiling for years and nobody could fix the problem. Erick’s team solved the issue… Highly recommend these guys.”
Tim F.Google reviewShingle roof repair
“I asked for the service yesterday and he promised that will be here today, he came and finishes everything in few hours. The price was what I was expecting.”
Ahmit S.Google reviewShingle roof repair
- Karen C.
“Erick showed up within an hour.”
- Diana S.
“Personable and professional crew. On time and very hardworking.”
- Marcos P.
“Mike did a great job at my roof.”
- Theresa K.
“Answered quickly showed up on time”
- John S.
“Professional and no nonsense. The way I like things done.”
- Aly A.
“Very competitive price and good work.”
- Christine L.
“It was a small job but is done as carefully and everything looks uniform. Thank you Erick”
Find your town
Towns we serve in Mercer County
We work in all 12 Mercer County towns. Town not listed? Call (201) 397-0232 and we’ll confirm.
- East Windsor
- Ewing
- Hamilton
- Hightstown
- Hopewell Borough
- Hopewell Township
- Lawrence
- Pennington
- Princeton
- Robbinsville
- Trenton
- West Windsor
Nearby counties we serve
Mercer County roofing questions
Do you work in Mercer County?
How quickly can you get to a roof leak in Mercer County?
Can you fix the flat roof on my Trenton rowhouse?
My house is in a Princeton or Trenton historic district. Can you replace the roof?
Do you repair slate roofs?
Do I need a permit for a new roof in Mercer County?
Sources. U.S. Census Bureau, American Community Survey 2024 1-year estimates (via Census Reporter) · National Park Service, National Register nomination: Mill Hill Historic District, Trenton · Trenton Historical Society, Trenton historic districts · Preservation New Jersey, Princeton Historic Preservation Commission · National Park Service, National Register nomination: Princeton Historic District. Last reviewed November 2026.
- 4.8 ★ on Google106 reviews
- 4.9 ★ on HomeAdvisor143 reviews
Need a roofer in Mercer County?
Free inspection, photos of every problem area and a written price. No pressure either way.