Build a Legal ADU in New Jersey — Done Right.
Jazz Construction Group handles everything — permits, design, and construction — so you can unlock rental income or multi-generational living without the headaches.
- Site assessment & zoning compliance review
- Custom architectural design & engineering plans
- Full permit acquisition & municipal coordination
- Turnkey construction with licensed tradespeople
- Final inspection support & certificate of occupancy
- Post-completion warranty & dedicated project manager
Your Property's Hidden Potential,
Fully Realized
An Accessory Dwelling Unit is a second legal residence built on your existing lot. New Jersey law now makes them easier than ever to approve — and Jazz Construction Group makes them effortless to build.
Attached Garage Conversions
Transform unused garage space into a modern, fully permitted dwelling unit without touching your existing home's footprint.
Detached Backyard Cottages
Standalone structures purpose-built for privacy, natural light, and long-term property value appreciation.
Basement & Interior Conversions
Unlock below-grade or interior square footage that already exists — often the fastest path to a legal second unit.
Every ADU Includes
- Licensed architect-stamped drawings
- Structural & MEP engineering
- Electrical, plumbing, HVAC rough-in & finish
- Insulation & energy-code compliance
- Interior finishes to your specifications
- Dedicated project manager from day one
What Sets Us Apart
- In-house permit specialists — no third parties
- 48-hour written feasibility report
- Fixed-price contracts with no hidden change orders
- Average 10% above-market resale premium
- 2-year craftsmanship warranty
- Local bank financing referrals available
New Jersey Homeowners Choose Us
More Than Any Other ADU Builder
More than 500 completed ADUs across 12 NJ counties — with a permit approval rate exceeding 98% and an average project delivery 30% faster than competitors.
Permit Mastery
Our in-house zoning team has navigated every municipality in our service area. We know the rules — and how to work with them efficiently.
Speed Without Sacrifice
Fixed project timelines, proactive communication, and no subcontractor surprises. Your build stays on schedule and on budget.
Real ROI, Not Promises
Our clients generate an average of $2,800/month in rental income. We provide documented comps and rental projections before you commit.
Fixed-Price Guarantee
Your contract price is your final price. No surprise change orders, no material escalation clauses. What we quote, you pay.
Local Code Expertise
Every NJ municipality has unique ADU ordinances. We've learned them all — and we apply that knowledge to get your approval faster.
2-Year Warranty
We stand behind our work. Every Jazz ADU includes a two-year craftsmanship warranty and lifetime structural consultation.
ADU-Legal Municipalities
Across New Jersey
We've completed ADU projects in every county below — and have existing relationships with local planning boards to streamline your approval.
Northern NJ
- Hackensack
- Teaneck
- Ridgewood
- Fort Lee
Metro Area
- Montclair
- Maplewood
- South Orange
- Livingston
Central Corridor
- Westfield
- Summit
- Springfield
- Plainfield
Central NJ
- New Brunswick
- Edison
- Woodbridge
- Highland Park
Shore Region
- Red Bank
- Asbury Park
- Long Branch
- Rumson
Northwest NJ
- Morristown
- Madison
- Chatham
- Denville
Discover Your ADU Potential
in Just 48 Hours
We've engineered a streamlined process that takes you from curiosity to construction permit without bureaucratic delays or confusing back-and-forth.
Submit Your Property
Fill out our 2-minute eligibility form. We review your address, lot size, and zoning immediately.
Get Your ADU Report
Within 48 hours, receive a written feasibility report with ADU options, timelines, and cost ranges.
Review Before You Build
Walk through your report with a specialist. Zero pressure — just full transparency on what's possible.
We Build — You Profit
Jazz handles permits, design, and construction. You collect rental income while we handle every detail.
Is Your Property ADU-Ready?
Complete our 2-minute form and receive a personalized ADU eligibility assessment — at no cost, no obligation.
🔒 Your information is 100% private. No spam, no pressure — ever.
Real Numbers from Real Projects
Figures based on Jazz Construction Group projects completed across New Jersey in the past 24 months. Your numbers will vary based on scope and location.
| ADU Type | Typical Size | Build Cost Range | Avg. Monthly Rent | Est. Payback Period |
|---|---|---|---|---|
| Detached Cottage | 400–800 sq ft | $180,000 – $280,000 | $2,400 – $3,200 | 6–9 years |
| Garage Conversion | 300–600 sq ft | $90,000 – $160,000 | $1,800 – $2,600 | 4–6 years |
| Basement Conversion | 400–900 sq ft | $80,000 – $140,000 | $1,600 – $2,400 | 4–6 years |
| Interior Room ADU | 250–500 sq ft | $60,000 – $110,000 | $1,200 – $1,900 | 3–5 years |
| Above-Garage Suite | 350–700 sq ft | $130,000 – $220,000 | $2,000 – $3,000 | 5–8 years |
All figures are illustrative estimates. Final costs depend on municipality, lot conditions, and finish selections. A free written estimate is provided after your eligibility check.
"Jazz Construction Group turned our unused garage into a beautiful ADU in just under four months. The permit process was invisible to us — they handled absolutely everything. We're now earning $2,600 a month in rent."
"The 48-hour feasibility report was a game-changer. We knew exactly what was possible before committing a single dollar. Absolutely professional from start to finish."
"We wanted a place for my mother-in-law and Jazz delivered a stunning cottage in the backyard. Permits came through faster than we expected and the build quality is exceptional."
"Fixed-price contract meant zero stress. Not a single change order the entire project. The Jazz team communicated weekly with photos and updates. I'd recommend them without hesitation."
Common Questions, Answered Honestly
We believe in full transparency. Here are the questions every homeowner asks before starting their ADU project.
