When an attached suite is the right call
When the person moving in needs their own front door and their own bathroom, but you want them ten steps from the kitchen, not across the yard. Attached suites give the designer the most freedom — no basement stairs, no garage slab to work around — and they are the easiest to make step-free from the driveway in. The trade-off is that they are new construction: foundation, roof tie-in and an exterior wall opened up, which is why they price above a basement or garage conversion.
What we check at the design visit
- Buildable area. Setbacks, lot coverage and easements for your city — Overland Park, Olathe, Lenexa, Lee's Summit and Kansas City, Missouri each publish their own, and we pull them for your parcel before drawing.
- Foundation and floor level. A crawlspace or slab addition has to meet the existing floor without a step; we look at how the new framing meets the old.
- Roof connection. Where the new roof ties in decides how much of the existing roof gets touched and whether the suite ceiling can vault.
- Which wall opens. The connecting door is the whole design: off a hallway for privacy, off the family room for daily contact. We sketch both.
- Utilities. Bath and laundry drains to the existing stack or a new run, the panel's spare capacity, and whether the suite gets its own HVAC zone or a mini-split.
Is it an addition or an ADU?
Describe the bedroom, bath, cooking facilities and connection to the main house before choosing the permit path. An attached addition and an accessory dwelling unit can involve different use rules; the local reviewer must classify the actual design. Kansas City, Missouri's 2023 ADU ordinance allows attached units with an owner-occupancy requirement; Kansas's 2026 SB 418 created a by-right path for qualifying housing while leaving covenants and HOA rules in place. Confirm the use classification and its requirements with the responsible authority before the permit application. Permits and jurisdiction →
What it costs
Nationally, a full room addition runs $40,000–$200,000 and in-law suites of every type average about $82,750 (Angi, September 21, 2026), at roughly $100–$200 per square foot. A 400–600-square-foot attached suite with a full bath lands in the upper half of that; a kitchenette, a step-free entrance with a covered landing and a separate HVAC zone push it further. We give a fixed written price after the design visit, with every line marked included or excluded. The cost guide →
Built for the next twenty years
Zero-step entrance from the drive, 36-inch doors, a curbless shower with blocking in the walls for grab bars later, lever handles, a bedroom-to-bath route with no turns tighter than a walker needs. None of it reads as "accessible" and all of it matters in year five. Aging-in-place layouts →
Who does the work. Suites are built by our Kansas City installation partner — a licensed residential remodeling and additions contractor, regional NARI award recipient in residential interior remodeling. Those are the partner's credentials; the license, insurance and warranty for your project are written into your proposal before you sign.
Get a quote
Tell us the city, which space you're considering, who will live there and what they need. A photo of the space and a rough sketch help; you don't need drawings. Get a quote →
Not ready to talk yet? Start with the complete Kansas City in-law suite guide — suite types, permits by jurisdiction, costs and the questions to settle before you draw anything.
Sources & further reading
Primary references used for this guide. Confirm current requirements and property-specific applicability with the responsible authority.