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Fixed-price contracts (the quote is the price) · 3D design before demolition · Daylight & walk-out lower levels · High-end theaters, gyms, wine rooms & guest suites · MI-code egress & township permits handled · 4.7★ on Google
Real lower-level finishing for Forest Hills — Northern, Central, and Eastern — across Grand Rapids Township, Cascade Township, and Ada Township. The tall daylight basements and walk-out lots here were built for theaters, gyms, wine rooms, and guest suites. We build them to match the rest of your home, on one fixed price.
Book Your Free Discovery CallEvery Forest Hills 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 large-format tile, LVP, and engineered hardwood in a high-end lower level. More walkthroughs on YouTube →
619 36th St SW, Wyoming, MI 49509 · About 20–25 minutes from most Forest Hills homes. By appointment only — we come to you for in-home consultations. · Open in Google Maps →
Forest Hills has some of the best unfinished square footage in Kent County. The newer subdivisions and custom builds came with 9-foot pours, tall daylight windows, walk-out conditions on the ravine and river-grade lots, and mechanicals already tucked to one side. The shell is built for a theater, a gym, a wine room, a guest suite. The real question is which contractor treats your lower level like the rest of your house — and gives you a number you can trust.
An estimate is a guess. A fixed-price contract is binding. Once design and scope are locked, the number we put in writing is the number you pay — no allowance games, no surprise change orders on a six-figure lower level. The only way the number moves is if you choose to change scope, and that's priced and approved in writing before any work happens. See how the process works.
Our in-home consultation in Forest Hills 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 — theater vs. media nook, wine room, wet bar vs. full kitchenette, gym, guest-suite egress, walk-out integration, finish level — before you commit to anything.
Forest Hills is unincorporated, so permits route through Grand Rapids Township, Cascade Township, or Ada Township depending on your address. Every basement bedroom requires a code-compliant egress opening. We verify jurisdiction, pull the building permit plus separate electrical, plumbing, and mechanical permits, and coordinate every inspection as part of the fixed-price contract.
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. A high-end lower level is a long project — you should never have to chase your contractor to find out what happened this week.
Forest Hills is the most populous unincorporated community in Michigan — an affluent, family-anchored area built around one of the state's top-rated school districts. That matters for basements in one specific way: these are homes people stay in for twenty and thirty years. The lower level isn't a flip-and-sell finish. It's an investment in the home you're keeping, which is why theaters, gyms, wine rooms, and guest suites are the norm here rather than the exception.
The housing stock supports it. The newer subdivisions and custom builds came with 9-foot (and taller) basement pours, large daylight windows, and full daylight or walk-out lower levels on the ravine and Grand River-grade lots. That's exactly the shell a high-end finish needs — natural light, ceiling height, and grade-level access. Older boom-era Forest Hills homes (1980s–90s) have 8-foot pours, more variable floor flatness, and occasional pre-modern moisture detailing that we remediate before framing.
The jurisdiction picture is the other Forest Hills reality. Because the community is unincorporated, your permits route through whichever township controls your parcel — Grand Rapids Township (most of Forest Hills Northern and Central), Cascade Township (parts of Central along the East Beltline), or Ada Township (Forest Hills Eastern, toward Ada Village). We confirm jurisdiction during the discovery call so there's never a permit surprise mid-project.
A clean open finish and a full theater-plus-wine-room lower level are very different projects. The Thornapple process — discovery, 3D design, fixed price, build, walkthrough — is the same for both. Pick your scope below.
A full lower level finished as a real second living floor — full-height daylight windows, a level threshold to the patio, defined living and entertaining zones, and finished trim that matches the main floor. The grade-level access is the whole point: it should never feel like a basement.
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 as the centerpiece of the lower level or alongside the broader finish.
Rubberized flooring, a mirrored wall, dedicated ventilation, sound-rated framing where it sits below a bedroom, and the right outlet count for the equipment you actually use. In higher-end Forest Hills builds, often paired with a dry sauna or steam room and a wellness bath.
A climate-controlled, insulated wine room with proper vapor sealing, dedicated cooling, custom racking, and tasting-area lighting. One of the signature Forest Hills lower-level scopes — and one that has to be built right, because temperature and humidity control are not optional.
Full wet bar with sink, beverage center, ice maker, custom millwork, and lighting that flatters the bottles — anchoring a lounge built for hosting. We rough in supply, drain, vent, and dedicated circuits per the controlling township's code.
Private entry (often through an existing walk-out door), full kitchen or kitchenette, dedicated bedroom with code-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.
A guest or kids' bedroom in the lower level requires a real egress window. We handle excavation, the window unit, the well, and the cover — sized to MI Residential Code R310 (5.7 sq ft minimum net clear opening, 20" wide, 24" tall, 44" max sill). Many newer Forest Hills homes already have daylight openings that satisfy code. Full egress guide here.
Adding a full bath (or upgrading a builder rough-in into something usable). Below-grade plumbing, ejector-pump considerations, ventilation, waterproofing, and finish-level tile design. Often pairs with our Forest Hills bathroom remodel service for higher-finish builds.
Below are honest 2026 ranges for Forest Hills lower levels. Pricing depends on square footage, daylight vs. walk-out, egress count, bath count, kitchen ambitions, and finish level. Forest Hills numbers index above the metro median because the housing stock pushes scope toward theaters, wine rooms, and guest suites. 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, quality flooring, recessed lighting, and a single egress (or an existing daylight opening). Great for a secondary living room, kids' space, or workout area. Half bath optional. Floor leveling and moisture work priced separately.
Defined family lounge 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 — and the most common starting point in Forest Hills.
Acoustic home theater, full wet bar with beverage center, climate-controlled wine room, home gym, guest bedroom, full bath, custom built-ins, statement lighting. The lower level your friends ask to host the party in — built to match the rest of a Forest Hills home.
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.
Daylight and walk-out lower levels on the ravine and Grand River-grade lots often add $8,000 to $18,000 for grade-level moisture management, exterior threshold integration, and patio-side framing. Older Forest Hills homes with 8-foot pours and pre-modern moisture detailing sometimes add a meaningful pre-finish adder — priced into the fixed contract during discovery so it never becomes a surprise change order mid-project.
Forest Hills is an unincorporated community, so there's no single "Forest Hills building department" — permits route through whichever township controls your address. Forest Hills Northern is mostly Grand Rapids Township (with a small slice near Cannonsburg in Cannon Township). Forest Hills Central is primarily Grand Rapids Township or Cascade Township. Forest Hills Eastern often falls inside Ada Township toward Ada Village. One detail worth knowing: Ada Township contracts with Cascade Township for permit issuance and inspections — so an Ada-jurisdiction basement finish is reviewed by Ada Township Planning & Zoning, then issued and inspected through Cascade Township. We verify the right jurisdiction for your address, pull the building permit plus separate electrical, plumbing, and mechanical permits, and coordinate every inspection — rough-in, insulation, and final. You never step into a municipal office.
Michigan Residential Code R310 (egress) is non-negotiable in any basement bedroom or habitable sleeping space. The minimum net clear opening is 5.7 sq ft, with a minimum 20-inch opening width and 24-inch opening height. Sill height tops out at 44 inches above the finished floor. Window wells (where the opening is below grade) must provide at least 9 sq ft of floor area with a minimum 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 end up around 28" x 44" or larger. We handle excavation, the window unit, the well, and the cover.
The good news for Forest Hills: many newer homes here already have large daylight or walk-out openings that satisfy code in those rooms, so an egress retrofit isn't always required. We confirm what your specific scope needs during the discovery call and price it into the fixed contract before you sign. Deeper detail in our complete basement egress window guide.
Concrete slabs are poured to industry-flat tolerance, not finish-flat. That's enough for the structural floor — not enough for large-format tile, LVP, or engineered hardwood, which need a tighter flatness spec, and which a high-end Forest Hills lower level will almost always use. Most Forest Hills 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.
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 Forest Hills builds have it — some older homes do not); and design the wall assembly correctly. Closed-cell spray foam directly against foundation walls is the preferred approach on most Forest Hills 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. A wine room raises the bar further, with dedicated vapor sealing and cooling.
For daylight and walk-out lower levels on the ravine and Grand 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 change you didn't ask for — because the contractor didn't think about it — does not. We design that detail before the threshold gets ordered.
Real Thornapple lower-level builds from Forest Hills and the surrounding communities. Descriptive names — no client names, no street addresses.
A full high-end lower level for a Forest Hills-area home — an acoustically treated home theater with tiered seating, a custom wet bar with beverage center, a dedicated guest bedroom with code-compliant egress, a full bath, and custom millwork throughout. The room the whole household ends up in.
An indoor golf simulator bay, a climate-controlled wine room with custom racking, lounge seating with built-ins, a 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.
An Ada Township walk-out finished as a second living floor — kitchenette, dedicated bedroom with R310-compliant egress, full bath, a home gym, 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 Forest Hills and the neighboring communities. From a walk-out guest suite in Ada to a theater-and-wine-room lower level in Cascade Township to an East Grand Rapids family-room finish, the same fixed-price, design-protected process runs every project. This page is part of our broader basement finishing practice.
The real questions Forest Hills homeowners ask before booking a basement finish — not the generic ones the other guys recycle.
Forest Hills basement finishing typically runs from about $50,000 for a clean open finish (drywall, flooring, lighting, single egress, no bath) up to $175,000+ for a full high-end lower level with a theater, wet bar, wine room, gym, guest suite, and multiple baths. Most Forest Hills projects land in the $90,000 to $150,000 range because the housing stock pushes scope toward theaters, wine rooms, and guest suites rather than a simple finish. Guest and in-law suite conversions with a full kitchen usually start around $130,000. Daylight and walk-out lower levels often add $8,000 to $18,000 for grade-level moisture management. Every project locks at a fixed-price contract once design and scope are finalized. Full breakdown on our basement remodel cost page.
Forest Hills is an unincorporated community, so permitting jurisdiction depends on your specific address. Most Forest Hills Northern properties fall under Grand Rapids Township (with a small slice near Cannonsburg in Cannon Township). Forest Hills Central is mostly Grand Rapids Township or Cascade Township. Forest Hills Eastern often falls inside Ada Township as you move east toward Ada Village. One important detail: Ada Township contracts with Cascade Township for building permit issuance and inspections, so an Ada-jurisdiction basement finish is reviewed by Ada Township Planning & Zoning and then issued and inspected through Cascade Township. We verify the correct jurisdiction for your address, pull every permit, and coordinate every inspection as part of the fixed-price contract.
Yes. Any basement finishing project that adds habitable space requires a building permit from the township that controls your address — Grand Rapids Township, Cascade Township, or Ada Township — plus separate trade permits for electrical, plumbing, and mechanical work. Thornapple pulls every permit and schedules every inspection (rough-in, insulation, and final) directly with the controlling building department as part of the fixed-price contract. You never have to coordinate with a township office.
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 sq ft, 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 sq ft of floor area with at least a 36-inch projection from the foundation wall, plus 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. Many newer Forest Hills homes already have large daylight or walk-out openings that satisfy code in those rooms. Full guide: basement egress window requirements.
Yes — these are some of the most-requested Forest Hills lower-level scopes, because the newer homes here have the 9-foot pours and tall daylight windows that make high-end finishes work. We build acoustically treated home theaters with tiered seating and dedicated AV circuits, home gyms with rubberized flooring and sound-rated framing (often paired with a sauna or steam room), climate-controlled wine rooms and tasting cellars with dedicated cooling and vapor sealing, and full wet bars with sink, beverage center, and custom millwork. All designed in 3D before any framing goes up, and all priced into one fixed contract.
Yes. Guest and in-law suite conversions are a frequent Forest Hills scope, especially in homes with daylight or walk-out lower levels. 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 ceiling-floor isolation. We confirm zoning and accessory dwelling unit rules with the controlling township — Grand Rapids Township, Cascade Township, or Ada Township — before design begins. More on our basement apartment conversion guide.
Yes — daylight and walk-out lower levels are common in the newer Forest Hills subdivisions and on the ravine and river-grade lots near the Grand River. A walk-out changes the scope in three meaningful ways: the existing walk-out door becomes a primary entrance (especially for a guest suite), egress requirements relax in the rooms with grade-level access, and grade-level moisture management becomes more important. We design walk-outs to read as a real ground-floor living space rather than a finished basement — full-height windows, a level threshold to the patio, and finished trim that matches the rest of the home.
Most Forest Hills basement finishing projects run 10 to 16 weeks from demolition to final walkthrough. A simpler open finish (drywall, flooring, lighting, no bath) finishes on the faster end. Full high-end lower levels with a theater, wine room, wet bar, gym, and multiple baths — and guest suites with full kitchens — typically run 14 to 20 weeks because of custom millwork and longer material lead times. Daylight and walk-out lower levels usually add a week for the exterior threshold and grade work. Every milestone is mapped in your contract and tracked in your project portal.
Our full basement finishing service page — scope, process, what's included, FAQs.
Real Grand Rapids-area basement remodel costs broken down by scope and finish level.
What drives basement finishing cost in West Michigan — scope, finish level, egress, baths, and bars.
Our Forest Hills bathroom service line — primary suites, basement baths, and aging-in-place builds.
MI Residential Code R310 requirements, sizing, installation, and what a compliant egress retrofit costs.
Kitchen remodels, bathroom renovations, additions, and whole-home projects across Forest Hills.
It starts with a free discovery call — a quick phone conversation to discuss 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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