How to Choose the Best ADU Builder in Maine & New Hampshire (2026)

What to ask an ADU builder in Maine or New Hampshire

Use this checklist on the first call. A real builder can answer it without a design retainer.

1. Do they publish real prices?

We publish 10 turn-key models $155,000–$408,000. The Bean (384 sq ft) starts at $155,000. The Ossipee (1,049 sq ft + 2-car garage) starts at $408,000. A builder who will not show a starting price before you hand over your email is managing a negotiation, not quoting a product.

The 10 published models

• The Bean — 384 sq ft — $155,000
• The Wakefield — 525 sq ft — $227,000
• The Newfield — 600 sq ft — $206,000
• The Summit — 654 sq ft — $247,000
• The Bentley — 750 sq ft + attached garage — $293,000
• The Shapleigh — 800 sq ft — $265,000
• The Spruce — 882 sq ft — $305,000
• The Washington — 896 sq ft — $321,000
• Ella's Retreat — 981 sq ft — $338,000
• The Ossipee — 1,049 sq ft + 2-car garage — $408,000

See the model pages or use instant pricing.

2. Do they self-perform dirt work?

Langone owns the excavation fleet. Site work and the ADU sit under one prime. Specialty trades (plumbing, electrical) are contracted under that prime.

3. Who pulls permits and who is DEP certified?

We pull permits. Dylan Langone is Maine DEP Erosion Control Certified. Setbacks, septic, and shoreland still apply after LD 2003, LD 1829, LD 2173, and NH HB 577.

4. Can you tour a job or see real site photos?

Ask. We publish job photos of excavation, foundation, and septic — not a stock white house on a slope.

Book a free consult or call (978) 987-0089.