Cost, timing and what to ask
The 8 questions that actually decide roof replacement, answered with estimated ranges.
Note 01What is the most expensive part of replacing a roof?
On a Monroe house, after the squares themselves, it is usually the openings and the deck. One Monroe contractor's published figures put a new skylight at about $900 to $2,200 each against about $200 to $450 to reflash one, chimney flashing at about $350 to $750, and plywood at about $85 to $110 a sheet with 2 to 12 sheets typical. That is why every opening gets its own line on our quotes.
Note 02What is the average cost of a roof replacement in NJ?
For Monroe Township, one local contractor's published 2026 figures put an average 20-square roof at about $10,800 in architectural shingle, and most houses at about $13,000 to $21,000: $11,500 to $16,200 for 1,800 to 2,200 square feet, $14,000 to $19,000 for 2,200 to 2,800, and $18,000 to $25,000 or more past 3,000. Skylights and the chimney move it from there, which is why they are priced separately.
Note 03Do you need a permit to redo a roof in NJ?
Not for a detached one- or two-family house. New Jersey's construction code treats re-roofing, including a complete replacement, as ordinary maintenance there (N.J.A.C. 5:23-2.7). Attached homes, townhomes and condominium buildings are a different case, and framing or decking work can need one. In Monroe the Construction Office is at 1 Municipal Plaza, and the quote says which case your house is; the rule was amended in 2025, so confirm with the office if in doubt.
Note 04Is $30,000 too much for a roof?
In architectural shingle it is above most Monroe houses' estimated range of $13,000 to $21,000, so ask what is in it. Several skylights replaced at an estimated $900 to $2,200 each can account for a lot of the gap. A New Jersey thread about a $42,000 quote on roughly 2,300 square feet drew the reply that around $26,000 or lower was expected for a high-quality shingle. Ask for the openings line by line.
Note 05How much does it cost to repair a roof in New Jersey?
Most roof repairs are estimated at $300 to $3,000, with the average near $900 nationally. Locally, one Monroe contractor publishes chimney flashing at about $350 to $750 and skylight reflashing at about $200 to $450. A cracked pipe boot on a single-story roof sits at the low end; flashing cut into a two-story chimney sits higher.
Note 06What to look for when choosing a roofing contractor?
Someone who measures the roof and looks in the attic before pricing it, names the products in writing, lists the chimney, each skylight and the vents with what is being done to each, and puts the New Jersey HIC registration number on a written contract. Any home improvement contract over $500 has to be in writing, and it carries a three-day right to cancel.
Note 07Should a 20 year old roof replace?
Not on age alone. Asphalt shingle is generally rated at 15 to 30 years, so twenty is when a roof deserves a proper look, not an automatic replacement. If the shingles still hold their granules, the flashings at the chimney and skylights are sound and the attic is dry, a repair may buy years.
Note 08What is the average cost to replace a roof on a 2000 square foot home?
In Monroe, one local contractor's published 2026 figures put a 1,800 to 2,200 square foot house at about $11,500 to $16,200 in architectural shingle. Floor area is only a rough guide: a single-story ranch has far more roof per square foot of floor than a two-story colonial, and two houses of the same size can carry very different numbers of skylights.
Every range on one page
Estimated ranges for Middlesex County, and a written quote once the job is seen.
Roof Replacement - $11,500 - $25,000 (est.)
Architectural shingle, $450 - $650 a square in monroe.
Roof Repair - $300 - $3,000 (est.)
Chimney flashing about $350 - $750 in monroe.
Emergency Roof Repair - $300 - $3,000 for the repair (est.)
Temporary cover quoted on its own first.
Storm Damage Roof Repair - $300 - $3,000 (est.)
A stripped section about $9.20 - $11.62 a sq ft, national.
Flat Roof Repair - $300 - $3,000 (est.)
National repair band; most flat jobs at the low end.
Metal Roofing - $8,000 - $60,000 (est.)
A 20-square roof at $4 - $30 a sq ft, national figures.

Want a figure on it?
The estimated range before we travel, and the figure in writing before any work starts.
