Basement Finishing
Transform your basement into functional living space with our finishing services.
Price starts at $10,000
BrowseBasement Remodeling and Finishing in Mercer Island, WA
If you’re searching for basement remodel Mercer Island, you want straight answers. We build dry, quiet, code-clean basements—not “makeovers.” Mercer Island homes have slopes, rock, and tight access; we plan around it. Bedrooms get legal egress. Offices get proper lighting and data. Basement bars get the plumbing and ventilation they need. We pull permits, coordinate inspections, and keep trades in sequence so the schedule doesn’t wander. RENOVA Contractors LLC is local; we spec materials you can actually source on the Eastside and we don’t promise unicorn lead times. Walk us through your space—we’ll tell you what pencils out and what doesn’t.
Basement Finishing Services in Mercer Island by RENOVA
Basement Flooring
Choose from a variety of flooring options to enhance your basement's comfort and style.
Price starts at $5,000
Basement Remodel
Revamp your basement for improved functionality and aesthetics with our remodeling services.
Price starts at $12,000
Basement Entertainment Center
Create the ultimate entertainment space in your basement with our customized solutions.
Price starts at $8,000
Basement Bathroom
Add convenience and value to your basement with a professionally installed bathroom.
Price starts at $6,000
Basement Waterproofing
Protect your basement from moisture and water damage with our waterproofing solutions.
Price starts at $5,500
Basement Insulation
Ensure year-round comfort and energy efficiency in your basement with proper insulation.
Price starts at $4,500
Basement Bar
Create a stylish and functional bar space in your basement for entertaining guests.
Price starts at $7,000
Basement Windows
Brighten up your basement and improve ventilation with new windows.
Price starts at $3,500
We handle design-through-finals for finished basement Mercer Island projects:
Design-build layouts – media rooms, guest suites, day-light basement options, storage walls, small gyms.
Moisture control – site drainage checks, slab/rim sealing, vapor control, insulation that won’t trap moisture (basement moisture control Mercer Island).
Sound & comfort – resilient channels, mineral-wool batts, quiet bath fans, supply/return air balance.
Electrical & data – dedicated circuits for AV, task lighting layers, outlet spacing to code, office drops.
Plumbing – baths, laundries, wet bars; ejector pumps where grades demand it.
Finishes – LVP/porcelain in wet zones, engineered wood where readings allow, tiled baths, built-ins, stair upgrades.
Basement waterproofing – crack injection, sump packages, dimple mats, exterior tie-ins when required.
Future ADU planning – rough-ins, separate entry, ventilation allowances (basement design-build).
Local code notes that we follow without drama: Mercer Island enforces the 2021 code cycle (effective Mar 15, 2024). Bedroom additions require IRC R310 emergency escape/rescue openings; we size the clear-openings and well details accordingly. If an exterior well or perimeter drain is part of the scope, we schedule around the Island’s wet-season limits (Oct 1–Apr 1) or pursue the waiver if the site qualifies. Electrical permits are through WA L&I; whoever performs the electrical (our licensed sub) pulls their own permit. All that paperwork is included in your turnover packet.
Licensed, Bonded, Insured
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Cost to Finish a Basement in Mercer Island
Basement Finishing
| Service | Cost Range | Average Cost | Labor Cost | Material Cost |
|---|---|---|---|---|
| Framing and Insulation | $6,500 - $19,500 | $13,000 | $9,750 | $3,250 |
| Drywall Installation | $3,900 - $9,100 | $6,500 | $4,550 | $1,950 |
| Flooring Installation | $6,500 - $19,500 | $13,000 | $9,100 | $3,900 |
| Painting | $1,950 - $6,500 | $4,225 | $3,250 | $975 |
| Electrical Work | $2,600 - $13,000 | $7,800 | $5,850 | $1,950 |
| Plumbing Work | $3,900 - $15,600 | $9,750 | $7,150 | $2,600 |
| HVAC Installation | $5,200 - $13,000 | $9,100 | $6,500 | $2,600 |
| Finishing (doors, trim, etc.) | $2,600 - $7,800 | $5,200 | $3,900 | $1,300 |
| Miscellaneous (permits, inspections, etc.) | $1,950 - $6,500 | $4,225 | $3,250 | $975 |
Home Remodeling Services Photos
RECENT BASEMENT REMODELS
We’ve turned 3 basements into cozy and useful spots this year. Whether it's a game room, office, or extra bedroom, see how basements can be transformed!
Area:
basement
Timeline:
3 to 6 weeks
RECENT BASEMENT REMODELS
We’ve turned 3 basements into cozy and useful spots this year. Whether it's a game room, office, or extra bedroom, see how basements can be transformed!
Area:
basement
Timeline:
3 to 6 weeks
Remodel ROI Calculator 2025
basement
$30,000 - $200,000
$70,000
NaN%
kitchen
$25,000 - $150,000
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How we work
Call & walkthrough – measure, photos, headroom, structure, water paths, panel capacity.
Scope & budget – options with allowances. If egress or a lift pump is likely, it’s on page one.
Design – layout, lighting layers, AV/data, bath details; coordinate soffits for ducts/beams.
Permits – building/mechanical with the City; electrical via L&I. We line up inspections early so roughs don’t sit.
Water first – fix exterior grades/drains or add interior control, then vapor/insulation assemblies (no trapping moisture).
Rough-ins – framing, MEP, sound control. Pre-cover check so nothing gets buried wrong.
Inspections – we’re on site; corrections handled the same week when possible.
Finishes – drywall, floors, millwork, paint; fixtures go in late to avoid damage.
Finals & handoff – permit finals, photo set, and a simple “what’s behind the walls” map for future work.
Materials Basement remodelers in Mercer Island use
We stick with parts that hold up and are easy to source nearby:
- Plumbing / lighting: Ferguson Bath, Kitchen & Lighting – Bellevue (fixtures, valves, ventilation)
- Lumber, doors, trim: Dunn Lumber – Bellevue
- Flooring & tile showroom: Contract Furnishings Mart – Redmond (LVP, tile, quartz; fast turns)
- Surfaces: MSI Surfaces – Seattle/Kent distribution & showroom (quartz, porcelain, LVT)
- Tile distributor: Statements Tile – Seattle/Tukwila
- Waterproofing: Schluter membranes/drains; Dricore where subfloor decoupling makes sense
- Acoustics/insulation: Rockwool; resilient channel with caulked seams overhead
We pick SKUs with realistic lead times and local warranty support — you’ll see them in your spec packet before we order.
FAQ
What’s a realistic basement remodel budget around here?
If I add a bedroom, do I need an egress window—and how big?
Can we dig for an egress well or exterior drain in winter?
What’s the right wall build for a dry, finished basement—do I need interior poly?
Basement bath or bar—sump pump or sewage ejector?
Will an egress window under a deck/porch pass?
Who pulls the electrical permit—me or the contractor?
Contact Us
- 206-255-2708sales@renova.contractors
- 221 1st ave w, #247, Seattle, WA 98119
- Monday – Sunday 9:00AM – 9:00PM
