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Fixed-price contracts (the quote is the price) · 3D design before demolition · Walk-out & daylight lower levels · Wine rooms, home theaters, golf sims, gyms, in-law suites · MI-code egress & Ada Township permits handled · 4.7★ on Google
Luxury lower-level finishing for Ada Township — from the Grand and Thornapple River estates and Ada Village to the Forest Hills subdivisions. Real permits. Real MI-code egress. Real walk-out grade and floor-leveling work before the drywall goes up.
Book Your Free Discovery CallEvery Ada basement we finish starts with a conversation about whether the concrete floor is level (consistent grade) and whether it's flat (no high or low spots in a 10-foot run). One question. Two very different answers. Real implications for the wide-plank engineered hardwood, large-format tile, and LVP that Ada finishes call for. More walkthroughs on YouTube →
619 36th St SW, Wyoming, MI 49509 · By appointment only — we come to you for in-home consultations. · Open in Google Maps →
Ada has some of the best unfinished square footage in West Michigan — 9-foot pours, daylight windows, walk-out conditions on the river-grade lots, framed mechanicals already tucked to one side, and the budget to finish it as a true second living floor. The shell is there. The foundation is done. The question is which contractor actually treats your lower level like the rest of your house — and protects the six-figure number while doing it.
An estimate is a guess. A fixed-price contract is binding. On a $120K or $180K Ada lower level, that distinction is the single most important protection you have. Once design and scope are locked, the number we put in writing is the number you pay — no allowance games, no surprise change orders. The only way it moves is if you choose to change scope, and that's priced and approved in writing first. See how the process works.
Our in-home consultation in Ada is a working session, not a sales pitch. We measure the basement, sketch a real 3D model in front of you, and hand back a budget range tied to actual scope choices — wine room vs. open bar, theater vs. media nook, egress count, walk-out integration, finish level — before you commit to anything.
Ada's permit pathway is unusual — it routes through Cascade Township, and a basement bedroom on a septic lot can pull in Kent County Health. We pull every permit, coordinate every inspection, and handle every township and county interaction as part of the fixed-price contract. You never step into a municipal office.
Every Thornapple client gets a private project portal with the full schedule, photo updates after each day on-site, change-order history, and a single point of contact. Most basement contractors expect you to chase them. We expect to manage the project so you don't have to.
Ada Township is defined by water and grade. Both the Grand and Thornapple Rivers run through the township, and the sloped, wooded, river-grade lots mean a large share of Ada homes were built with a walk-out or daylight lower level — a floor that opens to grade rather than sitting fully below it. That single fact shapes nearly every Ada basement project: where the egress comes from, where the suite entrance goes, how the patio ties in, and how hard we have to work on grade-level moisture before framing.
Ada is also affluent — it is the corporate home of Amway and Alticor, and the finish expectations on an Ada lower level run well above the broader Grand Rapids market. The lower levels we finish here are wine cellars, dedicated home theaters, golf simulator bays, full gyms with sauna or steam, and bars built to host — not a builder-grade rec room. The materials are real: wide-plank engineered hardwood, large-format tile, stone, and millwork-level trim.
The other Ada reality is permanence. The Forest Hills CDP covers roughly 89% of Ada Township and is the most-populated CDP in Michigan, and Forest Hills Public Schools keeps families in the home for the long haul. When you're staying for the next twenty years, finishing the lower level for how you actually live — entertaining, an aging parent, returning adult kids, a home office wing — almost always beats moving. We confirm your exact jurisdiction and lot conditions during the discovery call.
A walk-out guest suite and a full wine-room-and-theater entertainment level are very different projects. The Thornapple process — discovery, 3D design, fixed price, build, walkthrough — is the same for both. Pick your scope below.
The signature Ada finish — a lower level that opens to grade and reads as a true second living floor. Full-height windows, a level threshold to the rear patio, finished trim matching the main house, and grade-level moisture and threshold detailing handled before framing. The walk-out door often becomes the entrance for a suite.
Acoustic-treated walls and ceilings, tiered seating risers, dedicated AV and lighting circuits, in-wall speaker pre-wire, and the right kind of dark room with the right kind of low lighting. Built in or alongside the broader lower-level finish — a common centerpiece of an Ada entertainment level.
A climate-controlled cellar or a glass-walled wine room built right — proper insulation and vapor control, a dedicated cooling unit, custom racking and display lighting, and a finish that makes it the room people stop in. One of the most-requested Ada luxury scopes, often paired with the bar.
Rubberized flooring, mirrored wall, dedicated ventilation, sound-rated framing if it sits below a bedroom, and the right outlet count for the equipment you actually use. On higher-end Ada builds we pair the gym with a dry sauna or a steam room and a rinse shower.
Full wet bar with sink, beverage center, ice maker, custom millwork, and lighting that flatters the bottles — or a kitchenette with cooktop, fridge, and prep counter for a suite. We rough in supply, drain, vent, and dedicated circuits per code. The social anchor most Ada lower levels are built around.
A guest bedroom with a private full bath is one of the most common Ada scopes — and a below-grade bedroom requires a real egress window. We handle excavation, the window unit, the well, and the cover, sized to MI Residential Code R310. On a walk-out lot, grade-level access often satisfies egress without a retrofit. Full egress guide here.
Private entry (often through an existing walk-out door), full kitchen or kitchenette, dedicated bedroom with R310-compliant egress, private full bath, separate climate zoning where possible, and acoustic ceiling-floor isolation. Built for parents, returning adult children, or long-term guest hosting. We confirm Ada Township ADU zoning before design.
The whole thing — bar and beverage center, theater or media room, wine room, full bath, guest suite, custom built-ins, and statement lighting, designed to flow as one space. The lower level your friends ask to host the party in, and the everyday floor the whole household ends up on.
Ada Township's permit pathway is its own animal. A basement finish that adds habitable space requires a building permit plus separate electrical, plumbing, and mechanical trade permits — but Ada Township contracts permit issuance and inspections out to Cascade Township. You submit the application and plans to Ada Township Planning and Zoning, the Zoning Administrator signs off on conformity, water and sewer connection fees are paid where applicable, and the application then moves to Cascade Township for issuance and inspection. We pull every permit and schedule every inspection — rough-in, insulation, and final — end-to-end. You never step into a municipal office.
There's also an Ada-specific item that catches homeowners: many larger Ada lots are on private wells and septic systems. A septic system is rated for a set number of bedrooms. If your basement finish adds a bedroom beyond that capacity, it can trigger a Kent County Health Department review — drain-field setbacks, well-location verification, sometimes a system upgrade. We check this in discovery and price it into the fixed contract so it never becomes a mid-build surprise.
Michigan Residential Code R310 (egress) is non-negotiable in any basement bedroom or habitable sleeping space: minimum net clear opening 5.7 sq ft, minimum 20-inch width and 24-inch height, sill no higher than 44 inches above the finished floor, window wells at least 9 sq ft with a 36-inch projection and a ladder if deeper than 44 inches. Most retrofits land around 28" x 44" or larger. On Ada walk-out and daylight lots, grade-level rooms often satisfy egress without any retrofit at all. Deeper detail in our complete basement egress window guide.
Below are honest 2026 ranges for Ada Township lower levels. Pricing depends on square footage, walk-out vs. full basement, egress count, bath count, wine-and-theater ambitions, and finish level. Ada bands run above the broader Grand Rapids market because the finishes do. Every project locks at a fixed-price contract after design. For the deeper breakdown, read our basement remodel cost in Grand Rapids page or run a quick range in the cost estimator.
Insulation, drywall, finish flooring, recessed lighting, and a single egress where required. A defined family room or flex space at an Ada finish level. Half bath optional. Floor leveling and moisture work priced separately based on what the slab needs.
Defined family room and wet bar, dedicated guest bedroom with egress, full bath, custom millwork, upgraded lighting, finished mechanical room. The everyday lower level that earns its keep — the most common starting point for an Ada finish.
Full bar and beverage center, home theater, wine room, full bath, guest suite, custom built-ins, and statement lighting — often with a golf simulator bay or a gym-and-sauna zone. The lower level your friends ask to host the party in.
Private entry (often through a walk-out), full kitchen or kitchenette, dedicated bedroom with code-compliant egress, private full bath, separate living area, zoned climate control. Built for parents, returning adult children, or long-term guest hosting.
Walk-out and daylight lower levels often add $10,000 to $20,000 for grade-level moisture management, exterior door and threshold integration, and patio-side framing. River-corridor and older Ada estates with historical moisture or variable floor flatness sometimes carry a meaningful pre-finish adder — priced into the fixed contract during discovery so it never becomes a surprise change order mid-project. And if your basement bedroom triggers a Kent County Health septic review, that cost is scoped up front, not after demo.
Concrete slabs are poured to industry-flat tolerance, not finish-flat. That's enough for the structural floor — not enough for the wide-plank engineered hardwood, large-format tile, and LVP an Ada finish calls for, which need a tighter flatness spec. Most Ada basements need either self-leveling underlayment in targeted spots or full-floor leveling before the finish flooring goes down. The conversation about whether your floor is level (consistent grade across the room) vs. flat (no high or low spots in a 10-foot run) is the conversation in the video at the top of this page — and it matters more at this finish level, not less.
Moisture management happens before we frame. We inspect the existing slab and foundation walls for efflorescence, hairline cracks, and any history of seepage; verify the perimeter drain; confirm the sub-slab vapor barrier (newer Ada builds have it — some older estates do not); and design the wall assembly correctly. Closed-cell spray foam directly against foundation walls is the preferred approach on most Ada basements. Where spray isn't right, we use rigid foam board with a proper framing standoff. We never frame tight to a foundation wall with kraft-faced batt insulation — that's a moisture trap and a long-term mold problem under expensive finishes.
For walk-out and daylight lower levels on the river-grade lots, we pay extra attention to exterior grade, door-threshold detailing, and patio-side flashing. A walk-out door at the same grade as the finished interior floor looks great. A walk-out door with a 4-inch sill step you didn't ask for — because the contractor didn't think about it — does not. We design that detail before the threshold gets ordered.
Five phases, no surprises. Every one is documented in your project portal so you always know where you are.
Want more detail on any phase? Read the full design-build remodeling process — or jump straight to booking a discovery call.
Real Thornapple lower-level builds from Ada and nearby West Michigan homes. Descriptive names — no client names, no street addresses.
A full luxury lower-level build for an Ada-area home — custom bar with beverage center, media room with tiered seating, dedicated guest bedroom with code-compliant egress, full bath, and custom millwork throughout. The room the whole household ends up in.
Indoor golf simulator bay, lounge seating with custom built-ins, full bar with beverage center, and a primary-style bath. A lower level built around how the family actually relaxes — designed in 3D before any framing went up.
A river-grade walk-out finished as a second living floor — kitchenette, dedicated bedroom with R310-compliant egress, full bath, lounge area, and a level threshold from the interior floor to the rear patio. Extra grade-level moisture management priced into the fixed contract before framing.
“Communication and work completed was high quality.”
— Verified Google review (4.7★ average across 19 reviews)
From our Wyoming office at 619 36th St SW, we cover Ada Township and the neighboring communities. From a walk-out basement on a river-grade Ada lot to a Forest Hills in-law suite to a Cascade entertainment level, the same fixed-price, design-protected process runs every project.
The real questions Ada homeowners ask before booking a basement finish — not the generic ones the other guys recycle.
Ada basement finishing typically runs from about $55,000 for a clean open finish (drywall, flooring, lighting, single egress, no bath) up to $200,000+ for a full luxury lower level with a wine room, home theater, wet bar, full bath, and guest suite. Most Ada projects land in the $90,000 to $160,000 range because the finish expectations are higher here than in the broader Grand Rapids market. In-law suite and apartment conversions with full kitchens usually start around $150,000. Walk-out and daylight lower levels often add $10,000 to $20,000 for grade-level moisture management and threshold integration. Every project locks at a fixed-price contract once design and scope are finalized. Full breakdown on our basement remodel cost page.
Yes. Ada Township requires a building permit for any basement finishing project that adds habitable space, plus separate trade permits for electrical, plumbing, and mechanical work. The pathway is unusual: Ada Township contracts permit issuance and inspections out to Cascade Township. You submit the application and plans to the Ada Township Planning and Zoning Department; after the Zoning Administrator signs off and any water and sewer connection fees are paid, the application moves to Cascade Township for issuance and inspection. Thornapple pulls every permit and schedules every inspection — rough-in, insulation, and final — end-to-end as part of the fixed-price contract. You never have to coordinate with either township.
Michigan Residential Code (R310) requires an emergency egress opening in every basement bedroom and any basement used as habitable sleeping space. The minimum net clear opening is 5.7 square feet, with a minimum opening width of 20 inches and a minimum opening height of 24 inches. Sill height cannot exceed 44 inches above the finished floor. Window wells (where the opening is below grade) must provide at least 9 square feet of floor area with at least a 36-inch projection from the foundation wall, and a permanent ladder or steps if the well is more than 44 inches deep. Most code-compliant retrofits land at roughly 28" x 44" or larger. On Ada walk-out and daylight lots, rooms with grade-level access often already satisfy egress without a retrofit. Deeper detail in our complete egress window guide.
Yes — walk-out and daylight lower levels are the defining Ada basement condition. Ada Township is bisected by both the Grand and Thornapple Rivers, and the sloped, wooded, river-grade lots mean a large share of homes were built with a lower level that opens to grade. A walk-out changes the scope in three meaningful ways: the existing walk-out door becomes a primary entrance (especially for a guest or in-law suite), egress requirements relax in the rooms with grade-level access, and grade-level moisture and threshold detailing become more important. We design walk-outs to read as a true second living floor — full-height windows, a level threshold to the patio, and finish and trim that match the rest of the home.
Yes. In-law suite and apartment conversions are one of the most-requested Ada scopes, especially in homes with walk-out lower levels and among Forest Hills families staying in the home long-term. We design private-entry layouts (often through the existing walk-out door), full kitchens or kitchenettes, dedicated bedrooms with R310-compliant egress, private full baths, separate climate zoning where possible, and acoustic treatment for ceiling-floor isolation. Ada Township permits accessory dwelling units under specific zoning conditions — size, setback, separate entrance, and occupancy rules — so we confirm what is allowed on your specific lot with Ada Township Planning and Zoning before design begins.
It can — and this is the single biggest Ada-specific item to plan for. Many Ada properties, particularly larger lots along the rivers and in less-dense sub-areas, are on private wells and septic systems. Septic systems are rated for a specific number of bedrooms. If your basement finish adds a bedroom that pushes the home beyond the system's rated capacity, it can trigger a Kent County Health Department review — drain-field setback verification, well-location confirmation, or in some cases a septic upgrade. We check this during the discovery phase so it is priced into the fixed contract and scheduled into the timeline, not discovered mid-build. On a walk-out lot we can often design grade-level sleeping space that satisfies your needs while we confirm the septic picture.
Yes — those are exactly the scopes Ada lower levels are built for. We build climate-controlled wine cellars and glass-walled wine rooms with proper insulation, vapor control, and racking; dedicated home theaters with acoustic treatment, tiered seating risers, AV pre-wire, and the right low lighting; indoor golf simulator bays with the ceiling height, hitting-strip framing, and dedicated circuits a launch monitor needs; and full home gyms with rubberized flooring, mirrored walls, dedicated ventilation, and optional sauna or steam. Most Ada luxury lower levels combine several of these around a central bar and lounge. We model the whole thing in 3D before any framing goes up.
Most Ada basement finishing projects run 10 to 16 weeks from demolition to final walkthrough. Clean open finishes (drywall, flooring, lighting, no bath) finish on the faster end. Full luxury lower levels with a wine room, theater, bar, and full bath — and in-law suites with full kitchens — typically run 14 to 20 weeks because of the finish level and the trade coordination involved. Walk-out lower levels usually add about a week for the exterior threshold and grade work. Design and the Ada Township permit pathway add roughly 4 to 8 weeks up front. Every milestone — demo, framing, rough-in, inspections, drywall, flooring, finish — is mapped in your fixed-price contract and tracked in your project portal.
Our full basement finishing page — scope, process, what's included, and FAQs.
Real West Michigan basement costs broken down by scope, size, and finish level.
The deeper cost breakdown — what drives the number and where the money goes.
Our Cascade Township lower-level page — the township that issues Ada's permits.
Run a quick range for your specific basement scope before booking the discovery call.
Kitchen remodels, bathrooms, additions, and whole-home renovations for Ada homeowners.
Basement finishing is one piece of our design-build remodeling in Grand Rapids practice — design, build, and budget under one roof. Lower-level work often pairs with a ground-floor addition or a basement bath build.
When the lower level isn't enough square footage — bump-outs, master suites, second stories, and full-wing additions on the same Ada permit pathway.
Fixed-price bathroom remodels — primary baths, guest baths, accessibility, and the full basement bath builds that pair with a lower-level finish.
When every level needs attention, you need a partner who coordinates every trade, timeline, and detail.
It starts with a free discovery call — a quick conversation to talk through your project, get honest answers, and see if we're the right fit. No commitment. No pressure. Just clarity.
Book Your Free Discovery CallOr call us at (616) 404-3400
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