Much of Lambertville’s downtown housing is well over a century old and sits inside a historic district, while the low-lying blocks near the river carry drainage problems most of Hunterdon County never deals with. A roofing contractor in Lambertville has to read that difference.
William Penn Roofing & Exteriors has worked here and across the surrounding river towns since 2008, from the downtown core out to West Amwell, Hopewell, and across the bridge into Solebury. We are licensed in New Jersey and Pennsylvania, we know how the permit and historic review process works, and every project carries manufacturer and workmanship warranties.
Most of our work here comes from neighbors passing our name down the street. Read the reviews and judge the pattern yourself: fast answers on active leaks, repair-first assessments, and job sites left clean.
Photos tell you more about a roofer than a warranty page does. Our gallery shows completed tear-offs, repairs, and exterior work across Lambertville and the surrounding river towns, with before and after shots of each job.
Downtown row houses bring party walls, steep pitches, and no margin for error on flashing, while newer township builds face open wind off the river. Our residential roofing services cover both, from a single flashing repair to a full replacement.
We check shingles, flashing, pipe boots, drip edge, underlayment, ventilation, and gutters. You get photo documentation and a written scope, not a verbal guess.
We fix leaks, damaged shingles, and flashing failures. On older homes we repair first when the roof still has life left in it.
Full tear-offs let us correct the decking underneath, which older Lambertville roofs often need. New systems go on with quality underlayment and ice and water shield.
Storms tracking up the Delaware Valley hit every town on the river. Our storm damage repair crews tarp, stabilize, and document for insurance, with the same response north through Stockton.
One note worth knowing up front: some conditions only show up after the old materials come off. If damaged decking, failed flashing, or code corrections surface after tear-off, those findings are reviewed with you before any added work moves forward.
What a roof costs comes down to size, pitch, material, and what we find under the old shingles. Here is how to get a realistic picture before you commit.
Downtown storefronts and mixed-use buildings mostly run low-slope systems that fail quietly until they leak into inventory. Our commercial roofing work covers repair, replacement, restoration, and maintenance across the river towns, including Frenchtown upstream.
Leak detection, membrane patching, seam and flashing repair, and puncture correction to stop interior damage and keep you open.
Full system replacements when repair costs keep stacking up, using materials engineered for long-term weather resistance.
Coatings that improve waterproofing and reflectivity and extend service life. We confirm the roof is a real candidate before recommending it.
The right system depends on your roof design, budget, and what the neighborhood expects. We install across Hunterdon and Mercer counties, from riverfront period homes to newer construction near Princeton.
A practical choice for most pitched residential roofs, with strong value and a wide range of profiles and colors.
Standing seam and metal systems handle wind and heavy rain well, shed snow quickly, and last decades with little maintenance.
Chosen for natural character and premium appearance, cedar suits period homes when it is properly ventilated and maintained.
A high-end option for accents, bays, and porch roofs, valued for longevity and the patina it develops over time.
Slate provides exceptional durability and long service life, making it a strong choice for high-end homes.
TPO is an energy-efficient membrane designed for durable protection on flat and low-slope commercial roofs.
EPDM offers flexible, waterproof protection suited for long-term performance on low-slope systems.
Modified bitumen systems provide dependable, multi-layer protection for commercial flat roofing applications.
Roof work is often the right moment to fix the systems around it, especially on older homes where water has been finding its way in for years.
Undersized or poorly pitched gutters are a common failure point on steep older rooflines. Our gutter installation work protects fascia, siding, and foundations by moving water well away from the house.
Worn or warped siding lets moisture into the wall assembly. Our siding installation services improve protection, insulation, and appearance in one pass.
We handle skylight installation with proper flashing and sealing so the opening does not become the next leak.
Drafts and water intrusion around openings are fixable. Our window and door installation work improves comfort, security, and energy performance.
Cracking stucco hides moisture damage behind it. Our stucco remediation services address the structure underneath, not just the surface.
Plenty of regional roofers will drive out to Lambertville. Far fewer know how the local approval process runs, or how little margin the steep attached rooflines downtown leave on flashing detail. Here is what stands behind the work:
Roofing Lambertville and the river towns since 2008, with 120+ five-star reviews
Licensed in New Jersey (NJ-13VH12052900) and Pennsylvania (PA064886), insured and bonded
GAF, Owens Corning, and CertainTeed certified, which is what keeps your warranty enforceable years later
Local permit and approval experience most volume roofers simply do not have
One accountable project lead from first inspection to final walkthrough, so you are never re-explaining your house
Repair-first recommendations when a roof still has life in it, instead of a default tear-off
Often same-day response on active leaks and storm damage, with insurance claim documentation
Staging planned for tight downtown blocks, with the neighbor's property line protected and magnetic nail sweeps on the way out
If they are visible from the street and your property sits in the district, expect them to go through review with the rest of the exterior work. Rear-facing installations are usually a much easier conversation.
The roof sits above the problem, but drainage does not. On low-lying properties we size gutters for heavy runoff and move discharge points well away from the foundation.
We plan placement before the crew arrives and coordinate with the city when a street-side drop is the only option. On attached homes we protect the neighbor’s property line too.
Slate is often repairable long past the point most people assume, and a matched repair costs far less than a replacement. We will tell you when a slate roof is genuinely finished.
Heat escaping into the attic melts snow that refreezes at the eaves, which is common in older homes with retrofitted insulation. Correcting attic ventilation and adding ice and water shield during a replacement solves most of it.
A roof problem never gets cheaper by waiting. A stain spreading across the ceiling, a drip in the attic, or shingles in the yard after a storm are all worth a look now rather than next spring.
Reach out for a free estimate and we will give you an honest read on what is happening and what your options cost, with no pressure and no scare tactics.
We proudly serve Lambertville and surrounding communities throughout Hunterdon County and nearby Pennsylvania towns with dependable residential and commercial roofing services backed by experienced local crews.