Cost guide · Seattle & King County

Basement finishing Seattle cost

Seattle MasterFix project ranges for Seattle and King County, WA, shown next to cited public market benchmarks. Every job is priced as one written project estimate for the agreed scope after a free on-site visit.

Washington-registered contractor · No. SEATTMP744NL
5415 6th Ave NW, Seattle, WA 98107
Seattle and King County, WA

MasterFix ranges

Our project planning bands

Typical Seattle MasterFix project ranges, final price after free on-site estimate

Band	MasterFix	Notes
Starting at	$33,600/project	Entry scopes
Typical	$51,100/project	Most common mid scopes
High planning	$89,700/project	Complex or premium scopes

Moisture and egress work can push above typical.

Public Seattle market ranges

Public 2025–26 estimates from cited sources — shown for comparison, not as a MasterFix quote. Sources are linked below. Washington sales tax may apply on a signed contract.

Band	Market	What it represents
Low	$45,000/project	Smaller finish planning band (below CvV Seattle basement remodel)
Typical	$68,358/project	Cost vs. Value 2025 Seattle Basement Remodel
High	$120,000/project	Guest-suite / higher-finish planning band

CvV Seattle basement remodel $68,358. Angi Seattle basement renovation guide lists about $13,400–$38,900 for many renovation scopes (often lighter than a full finish).

How we work

Full general contracting, Ballard-based

Yes — full general contracting for basement finishing / remodels.

Seattle MasterFix Precision Craftsmanship (Seattle MasterFix Precision Craftsmanship) is a Washington-registered contractor #SEATTMP744NL, based at 5415 6th Ave NW, Seattle, WA 98107. Service area: Seattle and King County, WA. Related pages: /services/drywall/ · /services/paint/ · /services/laminate/ · /services/tile/.

FAQ

Common questions

What does Seattle MasterFix typically charge for basement finishing Seattle cost?

Typical Seattle MasterFix project ranges, final price after free on-site estimate: starting about $33,600, typical about $51,100, high planning band about $89,700. Public Seattle market midpoint used for comparison is about $68,358. Moisture and egress work can push above typical. Final price is after a free on-site estimate.

How much does basement finishing cost in Seattle?

Cost vs. Value 2025 lists a Seattle basement remodel at about $68,358 typical job cost with ~68% estimated cost recouped. Waterproofing, ceiling height, and egress can move the number a lot.

Do I need a permit to finish a Seattle basement?

Adding habitable space, new bedrooms, or changing egress usually needs an SDCI construction permit plus electrical/plumbing as applicable. Confirm with SDCI.

What trades does MasterFix handle in basements?

Seattle MasterFix provides full general contracting for basement finishing and remodels in Seattle & King County, including coordination of structure, waterproofing partners as needed, drywall, paint, flooring, and tile.

Photos

Photo slots for this guide

Placeholder slots for project photos. No images are claimed here until real job photos are added.

Photo slotdrywall finish
Photo slotlaminate/LVP floor
Photo slotpaint
Photo slotegress window if any

Sources

Where the planning numbers come from

Open sources used for the ranges on this page. Always verify current figures before you budget.

Estimates are non-binding until a written contract is signed. Compare two or three written bids on the same scope, and verify any contractor on WA L&I before you sign.

Want a number for your property?

Call (206) 550-4576 or send an estimate request. We will walk the scope and write a project quote — never an hourly guess.

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