Multigenerational living, designed right.
Custom in-law suites and accessory living units for Connecticut families. Whether attached, detached, or basement-based — designed for privacy, independence, and aging-in-place.
Privacy. Independence. Family.
An in-law suite isn't just a guest room. It's a fully-functional living space — with its own bath, kitchenette or full kitchen, and ideally a separate entrance — designed so an aging parent or adult child has independence without leaving the family.
Lagace builds in-law suites that meet Connecticut's 2026 ADU rules and accommodate the realities of multi-generational living: zero-step entries, walk-in showers, wider doorways, and easy-to-clean finishes.
- Attached in-law wings with separate entrance
- Basement conversions with full kitchen and egress
- Detached cottages on the same property
- Aging-in-place features (zero-step, wide doorways, ADA grab bars)
- Code-compliant separate metering when needed
- Septic and water tie-ins handled
Recent Connecticut projects.
Book a free, no-pressure quote.
Pick a time that works for you. Scott or one of our project leads will visit your home, walk the project with you, and follow up with a clear written estimate — usually within 5 business days.
- On-site consultation, no obligation
- Line-itemized written estimate
- Real timelines and a real start date
- CT Licensed & Insured (Reg. #NHC-0016939)
Prefer to call? Reach Scott directly at (860) 933-2700
Common questions.
What's the difference between an in-law suite and an ADU?
An in-law suite is a residential design pattern. An ADU is a legal/zoning classification. Many in-law suites qualify as ADUs under CT 2026 law if they have a separate entrance, kitchen, bath, and sleeping area. We build them to ADU code by default so they can be legally rented or sold separately later.
How much does an in-law suite cost?
Basement-based suites run $80,000-$150,000. Attached additions run $150,000-$280,000. Detached cottages run $200,000-$400,000+ depending on utilities and finish.
Can I include aging-in-place features?
Yes. We routinely build zero-step entries, 36-inch doorways, walk-in showers with grab bars, lever-handle hardware, raised outlets, and lower light switches. These are standard upgrades, not luxury add-ons.
Hartford & Tolland Counties
Based in Andover, CT — building, remodeling, and adding on to homes across central and eastern Connecticut for over two decades.
Ready to plan a space for the family?
Whether it's a kitchen refresh, a major addition, or a brand new home — we'll bring the same craftsmanship to your project that we'd bring to ours.
CALL DIRECT(860) 933-2700
Frequently Asked Questions
How much does an in-law suite addition cost in Connecticut?
In-law suite additions in Connecticut typically cost $120,000–$220,000 depending on size, whether it’s attached or detached, and finish level. We provide a detailed written estimate for every project.
Is an in-law suite the same as an ADU in Connecticut?
Yes — an in-law suite is a common type of ADU (accessory dwelling unit). Connecticut state law (PA 21-29) requires most towns to allow ADUs by right, and Lagace Construction handles all code compliance and permitting.
How long does it take to build an in-law suite?
Attached in-law suite additions typically take 4–7 months including permitting; detached units can take 5–8 months depending on utilities and site work.
Can an in-law suite have its own kitchen and entrance?
Yes — most in-law suites include a full or partial kitchen, bathroom, and a separate entrance, which we design in from the start to meet Connecticut ADU code requirements.
Do I need a permit for an in-law suite addition in CT?
Yes, in-law suite additions require a building permit and, in most towns, ADU-specific zoning compliance. We manage the entire permitting process from application through final inspection.