Basement Finishing
Transform your basement into functional living space with our finishing services.
Price starts at $10,000
BrowseBasement Finishing & Remodeling in Seattle
Planning a basement remodel in Seattle? We build it like living space, not storage. First we check moisture, head height, egress, and structure, then give you a straight line-item scope with dates. Our licensed crew handles framing, rigid foam on exterior walls plus mineral wool for sound, drywall, recessed lighting, outlets and circuits to code (GFCI/AFCI where required), HVAC supply and return, and plumbing for new baths or laundry. We install true waterproofing and drainage, cut and drain egress windows, and can convert to an ADU when zoning allows. Floors get subfloor systems with LVP or tile rated for basements, stairs are brought to code, and low ceilings use slim LEDs to keep headroom. Radon testing and dehumidifier rough-ins available on request. Permits and inspections are handled with the City of Seattle. We protect pathways, control dust with ZipWall and HEPA attachments, and send daily photo updates so there are no surprises. If you need storage, an office, media room, bedroom with legal egress, or a rentable ADU, we plan it around your goals and budget. Serving Ballard, Queen Anne, Fremont, Magnolia, Green Lake, and West Seattle with dry, quiet, code-compliant space that is ready to use.
Seattle basement Remodeling Videos
Watch our recent seattle remodel projects on YouTube Shorts – real jobs, quick overviews, and design ideas from RENOVA Contractors.
Basement Finishing Services in Seattle 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
RENOVA Contractors LLC is a full-scope basement remodel company in Seattle. We specialize in basement finishing, ADU conversions, and full interior buildouts — from concrete to trim. Whether you’re upgrading an old basement, finishing new construction, or converting space into a legal unit, we manage every phase of the job.
We’re a licensed basement remodel contractor in Seattle — everything we do meets current Seattle building code, from insulation and egress to HVAC and plumbing. If the job calls for structural changes, layout rework, or new windows, we bring in a licensed engineer or architect. And for material selection, layout, tile, and finishes — we include free interior design support with every project.
What’s Included:
- 🪚 Framing and layout – Bedrooms, rec rooms, laundry rooms, ADUs, or multi-room setups
- 🌧️ Insulation and moisture barrier – R-21 walls, vapor protection, floor prep
- 🪟 Egress windows – Fully compliant with IRC R310 — includes cutting, drainage, and trim
- 🔧 Plumbing rough-in – Full drain, supply, and vent for bathrooms or basement kitchens
- ⚡ Electrical – Lights, outlets, smoke/CO detectors, new circuits, subpanel work
- 🌬️ HVAC – Duct tie-ins or ductless systems for added zones
- 🧱 Drywall, paint, trim – Moisture-rated board, corner bead, baseboard, and doors
- 🛁 Bathrooms – Waterproof showers, tiled floors, fans, and fixtures
- 🪵 Flooring – LVP, tile, or carpet depending on the room type and slab condition
We’re a Seattle basement remodeling company that handles permits, manages trades, and keeps jobs moving — no handoffs, no missed steps. If you need a reliable basement renovation expert in Seattle, RENOVA Contractors LLC builds it clean, builds it once, and builds it right. ✅🧰📏
Licensed, Bonded, Insured
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Cost to Finish a Basement in Seattle
Basement Finishing
| Service | Cost Range | Average Cost | Labor Cost | Material Cost |
|---|---|---|---|---|
| Framing and Insulation | $5,000 - $15,000 | $10,000 | $7,500 | $2,500 |
| Drywall Installation | $3,000 - $7,000 | $5,000 | $3,500 | $1,500 |
| Flooring Installation | $5,000 - $15,000 | $10,000 | $7,000 | $3,000 |
| Painting | $1,500 - $5,000 | $3,250 | $2,500 | $750 |
| Electrical Work | $2,000 - $10,000 | $6,000 | $4,500 | $1,500 |
| Plumbing Work | $3,000 - $12,000 | $7,500 | $5,500 | $2,000 |
| HVAC Installation | $4,000 - $10,000 | $7,000 | $5,000 | $2,000 |
| Finishing (doors, trim, etc.) | $2,000 - $6,000 | $4,000 | $3,000 | $1,000 |
| Miscellaneous (permits, inspections, etc.) | $1,500 - $5,000 | $3,250 | $2,500 | $750 |
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Home Remodeling Services Photos
MODERN BASEMENT ADU REMODEL 2025
Full basement ADU with new bathroom, kitchen, separate access, recessed lighting, doors, trim, and fresh interior paint.
Area:
basement
Timeline:
2 months
BASEMENT REMODEL WITH KITCHENETTE 2025
Light finished basement in Magnolia, with faux beams, custom blinds, kitchenette (bar), AC unit upgrade and new waterproof flooring
Area:
basement
Timeline:
9 weeks
Remodel ROI Calculator 2025
basement
$30,000 - $200,000
$70,000
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kitchen
$25,000 - $150,000
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How we work
RENOVA Contractors LLC takes a hands-on, full-scope approach to basement remodeling in Seattle. We start with a walkthrough to measure the space, check structural elements, and discuss layout options. If the project involves egress, structural work, or ADU planning, we coordinate with licensed engineers or architects early.
From there, we build a clear line-by-line estimate and submit all required permits to the City of Seattle. Materials are ordered up front, and we manage every trade — framing, electrical, plumbing, HVAC, insulation, drywall, flooring, and finish work — in sequence. You’ll work with the same crew start to finish, with no rotating subs or missed steps.
Our team walks every inspection, keeps the jobsite clean, and finishes with a full walkthrough and labor warranty. We don’t cut corners — we build it once, build it clean, and build it to code. ✅
Materials to Use For your Basement
We don’t use cheap stock or bottom-shelf materials. Every basement we remodel in Seattle is built with code-compliant products that are rated for moisture, structure, and long-term durability.
Structure & Framing 🪚
- Framing lumber – Kiln-dried SPF or Douglas Fir from Dunn Lumber or Parr
- Pressure-treated wood – Used for all below-grade framing where required (IRC R317.1)
- Subfloor systems – DRIcore, Barricade, or custom ¾" plywood over vapor sheet
- Wall anchors & fasteners – Rated per IBC/IRC Table R602.3(1) and Seattle seismic (Zone D2)
Insulation & Vapor Control 🌧️
- Wall insulation – R-21 fiberglass batts (WA Energy Code Section R402.1.2)
- Floor insulation – R-10 rigid foam over slab where required for ADUs or storage
- Vapor barrier – 6-mil poly or StegoWrap, taped and sealed under flooring
- Air sealing – Great Stuff Pro foam or Tremco Acoustical Sealant for all penetrations
Plumbing, Electrical, HVAC ⚙️
- Plumbing – PEX (Uponor), ABS/PVC drains, sloped and vented to UPC code
- Electrical – 2020 NEC-compliant wiring, GFCI protection, tamper-resistant outlets
- HVAC – Ducts sealed with UL 181 tape or ductless mini-splits (Mitsubishi, Daikin) sized per load
Drywall, Trim, Finishes 🧱
- Drywall – ½" mold-resistant board on walls, ⅝" Type X where required
- Tile – Statements, United Tile, or Daltile — installed over Schluter KERDI or Wedi board
- Flooring – COREtec or Shaw LVP, CFM carpet, or tile rated for slab installation
FAQ
Can we make changes post-contract-signing?
How long does a basement remodel take?
Do you handle the permits and approvals?
Are your services insured?
What type of materials do you use?
Can you install a bathroom in my basement?
What is the cost of a basement remodel?
How do you ensure the basement remains dry?
Contact Us
- 206-255-2708sales@renova.contractors
- 221 1st ave w, #247, Seattle, WA 98119
- Monday – Sunday 9:00AM – 9:00PM
