If you’re a homeowner in Princeton, Hamilton, Lawrence Township, or anywhere in Mercer County and you’re thinking about a new roof, one of the first questions you’ll ask is: how much is this going to cost?
The honest answer is: it depends. But we can give you real numbers based on what we actually install every week here in New Jersey — not national averages that may have nothing to do with your home.
EFER Renovations has been replacing roofs in Mercer County since 2012. This guide reflects our 2026 pricing and what we see in the field.
Average Roof Replacement Cost in Mercer County, NJ (2026)
For a typical single-family home in Mercer County, expect to pay:
| Home Size | Roof Area (approx.) | 3-Tab Asphalt | Architectural Shingle |
|---|---|---|---|
| Small (1,200–1,500 sq ft) | 1,400–1,800 sq ft roof | $7,500–$10,500 | $9,500–$13,500 |
| Medium (1,500–2,200 sq ft) | 1,800–2,600 sq ft roof | $10,000–$14,500 | $13,000–$18,000 |
| Large (2,200–3,000 sq ft) | 2,600–3,500 sq ft roof | $14,000–$19,000 | $17,000–$24,000 |
| Very Large (3,000+ sq ft) | 3,500+ sq ft roof | $19,000–$28,000+ | $23,000–$35,000+ |
Installed costs include tear-off of one existing layer, underlayment, flashing, and cleanup. Multi-layer tear-offs, steep pitches, and complex geometries add cost.
What’s Included in a Full Roof Replacement?
A complete roof replacement from a licensed contractor like EFER Renovations includes:
- Tear-off of existing shingles (one layer standard; additional layers billed separately)
- Deck inspection — rotted or damaged sheathing is replaced
- Ice and water shield — along eaves and valleys per NJ building code
- Synthetic underlayment — the moisture barrier under shingles
- Drip edge — metal flashing along the perimeter
- Shingles — installed to manufacturer specifications
- Flashing — around chimneys, skylights, vents, and walls
- Ridge cap shingles
- Full cleanup and haul-away
- Building permit — required in most Mercer County municipalities
Roofing Material Costs Compared
3-Tab Asphalt Shingles
Installed cost: $4.50–$6.50/sq ft | Lifespan: 15–20 years
Best for: Budget replacements or homes being prepped for sale.
Architectural (Dimensional) Shingles — Most Popular
Installed cost: $6.00–$8.50/sq ft | Lifespan: 25–30 years
Best for: Most Mercer County homeowners. GAF Timberline HDZ and Owens Corning Duration are our most-installed lines. Lifetime limited warranty available through certified contractors like EFER.
Impact-Resistant Shingles (Class 4)
Installed cost: $8.00–$11.00/sq ft | Lifespan: 30+ years
Bonus: May qualify for an insurance premium discount. Best for: Homes with frequent hail exposure.
Metal Roofing (Standing Seam)
Installed cost: $12.00–$20.00/sq ft | Lifespan: 40–70 years
Best for: Long-term investment and low-maintenance homes.
What Drives Your Cost Up (or Down)
Roof Pitch
A steep roof requires more safety equipment and takes longer. Expect to pay 15–30% more than a flat or low-pitched roof of the same area.
Number of Layers Being Removed
NJ code generally allows two shingle layers. If you already have two, both must come off — adding $800–$2,000+ to the job.
Deck Condition
Rotted plywood sections must be replaced. Contractors typically charge $60–$90 per 4×8 sheet installed. We flag these during tear-off and get your approval before proceeding.
Complexity
Every valley, hip, dormer, skylight, and chimney adds labor and material. A simple gabled ranch is cheaper per square than a multi-dormer Colonial.
Permits
Required in virtually every Mercer County municipality. Permit fees range from $150–$600 depending on town. Your contractor should pull the permit — if they’re asking you to pull it, that’s a red flag.
Why NJ Costs More Than National Averages
National average estimates of $8,000–$12,000 don’t apply in New Jersey. Expect 15–25% above those figures because of:
- Higher NJ labor rates
- Mandatory building permits
- Stricter code requirements (ice and water shield coverage, etc.)
- Higher cost of living for crews, equipment, and overhead
Any quote significantly below the ranges in this guide warrants careful scrutiny.
Will Your Insurance Cover It?
If your roof was damaged by wind, hail, falling trees, or ice dams, your homeowner’s insurance may cover some or all of the replacement cost (minus your deductible).
EFER Renovations works directly with insurance companies and adjusters. We provide free damage inspections, help you document all damage, and work with your adjuster to ensure your claim is complete. Learn more about our storm damage and insurance claims process.
Get a Free Estimate from EFER Renovations
EFER Renovations provides free, no-obligation estimates for all roofing and exterior projects in Mercer County and throughout New Jersey. We are a GAF Certified, Owens Corning Preferred, and IKO Preferred contractor with over 13 years of local experience and a 10-Year Workmanship Warranty on every installation.
Call or text: (609) 851-5625
Address: 812 State Rd, Suite #212, Princeton, NJ 08540
Hours: Mon–Fri 8 AM–4 PM