Home Additions & Decks in Northern NJ
Family rooms, primary suites, second stories, and decks — designed and built under one contract.
★★★★☆ 4.7 Google Rating
Building Since 1999
Licensed & Insured
5 Counties Served
Home Addition Cost in New Jersey
In New Jersey, home additions typically run $200 to $400 per square foot. Most projects fall between $150,000 and $400,000 total. Second story additions run higher per square foot because of structural work. The final price depends on size, materials, and scope — a free estimate gives you exact pricing for your home.
Local note: costs run higher in Morris and Essex counties and more moderate in Sussex and Warren. Additions are custom by nature, so the only number that matters is the one priced for your house.
Need more space? As a home additions contractor in Morris County, NJ, AGR Builders designs and builds additions across Morris, Sussex, Warren, Passaic, and Essex counties. Family rooms, primary suites, in-law suites, second stories, bump-outs, and finished space over garages — we handle the architecture coordination, permits, foundation, framing, roofing tie-in, and every finish trade under one contract.
An addition is the biggest residential project most homeowners ever take on, and it’s the one where general contracting matters most. Foundation, framing, roofing, electrical, plumbing, HVAC, insulation, drywall — miss one handoff and the job stalls for weeks. We run the whole sequence, and our framing crews are our own trusted people, so the structure goes up right and on schedule.
Types of Home Additions We Build
- Family room and great room additions
- Primary bedroom suites with baths
- In-law and au pair suites
- Second story additions
- Kitchen expansions and bump-outs
- Mudrooms and entry additions
- Finished space over garages
- Home offices
Every addition starts with a site visit and an honest conversation about what’s feasible: zoning setbacks, lot coverage, and whether building up or out makes more sense for your home and budget. We’ll tell you if an addition isn’t the right answer — sometimes reconfiguring existing space costs half as much.
Our Process
- Free consultation — we look at your space and listen
- Design & detailed written estimate — line items, not guesswork
- Permits pulled and inspections scheduled with your town
- Build — our own crews, one point of contact
- Final walkthrough — we don’t leave until it’s right
Decks
Our crews also build decks — pressure-treated wood and composite, from simple platforms to multi-level outdoor living spaces with railings, lighting, and stairs. Most decks fall between $15 and $35 per square foot installed, with typical projects running $8,000 to $16,000 depending on size and materials. Many of our addition clients add a deck off the new space while we’re already on site, which saves on mobilization and keeps the design cohesive.
Our Addition & Deck Work
[ Replace with your real jobsite photos — Gallery block below. Before/after pairs are gold. ]
Why Choose AGR Builders
- Our own crews do the work — no day-labor strangers in your home
- Based in Flanders, NJ — we’re local, not a national franchise
- We pull permits and schedule inspections with your town
- Free, detailed written estimates — line items, not guesswork
- Financing available with low monthly payments
- One point of contact from first visit to final walkthrough
Financing: Low Monthly Payments
Additions are major investments, and financing makes them reachable without draining savings. AGR Builders offers customer financing through a partner company, with low monthly payments.
For a project this size, knowing the monthly payment upfront changes the conversation. Ask us to run the numbers with your estimate.
Proudly Serving Northern New Jersey
We build home additions and room additions throughout Morris County, Sussex County, Warren County, Passaic County, and Essex County.
Common Questions
How much does a home addition cost in New Jersey?
Most home addition projects fall between $150,000 and $400,000, or roughly $200 to $400 per square foot. Second stories run higher. Final price depends on size, materials, and scope — call for a free estimate.
How long does a home addition take?
Most additions take three to six months from groundbreaking to completion, depending on size and complexity. Permitting adds time upfront — we handle that process for you.
Do I need an architect for a home addition in NJ?
Most towns require sealed drawings for additions. We coordinate with architects and engineers and fold their work into the project — you don’t have to manage that separately.
Is it cheaper to build up or out?
Building out is usually cheaper per square foot; building up avoids losing yard and works on tight lots. We’ll walk your property and give you a straight recommendation.
Can you build a deck at the same time as my addition?
Yes — and it’s smart to do it together. Our deck builders in Morris County work alongside the addition crew, which saves you a separate mobilization and keeps everything designed as one project.
Will an addition disrupt my whole house?
We seal off the construction zone, maintain a separate entrance for crews when possible, and keep you informed weekly. It’s construction — there will be noise — but we run a tight, respectful site.
What Our Customers Say
[ Your real Google review here ]
[ Your real Google review here ]
[ Your real Google review here ]
Ready to Add Space to Your Home?
Free estimates. No pressure. Just honest numbers.