Multifamily Remodeling contractor —
Seattle & Puget Sound.
Multifamily remodels need predictable unit-turnover speed. We standardize finish packages, pre-stage materials, and run multiple units in parallel so vacancies don't stretch.
Multifamily construction work in the Puget Sound is, first and foremost, a property-operator's problem. Apartment owners, condominium associations, and small property managers are not buying construction — they are buying days of occupancy back, predictable cap-ex draws, fewer tenant complaints, and an envelope that does not leak. Golden State ADU Builders organizes the work around those metrics: how fast a vacant unit turns, how cleanly a phased envelope project moves around residents, how thoroughly each unit is documented before and after work, and how reliably the schedule holds.
Our multifamily scope covers four areas. Unit turns: paint, flooring, fixtures, kitchen and bath refresh between tenants, standardized so vacancies do not stretch. Common-area renovations: lobbies, corridors, fitness rooms, pool decks, leasing offices, and exterior amenity spaces. Envelope and capital projects: roofing, siding, windows, deck rebuilds, balcony resurfacing, and painting on the full building envelope — typically on a 20–30 year cycle and usually driven by an HOA reserve study or a property manager's cap-ex schedule. Tenant-occupied in-unit upgrades: kitchen, bath, and electrical work performed inside occupied units with the notification and access protocols required by Washington landlord-tenant law (RCW 59.18) and, for Seattle properties, by SDCI's Rental Registration & Inspection Ordinance.
What we do not claim to do is high-rise wood-frame or concrete ground-up multifamily construction at scale. That work belongs to specialized multifamily GCs with the bonding and supervision structure those projects require, and we are happy to refer you to one. Where Golden State ADU Builders fits is small multifamily renovation, capital improvement, and value-add construction — typically up to roughly 80 units in a single coordinated package, occupied or vacant — where the property operator needs a single accountable contractor across many small scopes.
Multifamily projects of three units and above fall under the International Building Code (IBC) with Washington amendments, rather than the IRC used for single-family and duplex work. The shift matters: fire-rated wall and floor assemblies, accessibility requirements, exit-path widths, and life-safety systems are all different. We design and execute renovations to the IBC requirements that apply to your specific occupancy classification, and we coordinate with the AHJ on the permit pathway — which in Seattle for multifamily envelope work runs through SDCI's commercial construction permit track, not the SF residential track.
Predictability is the product. Property managers do not need a creative contractor; they need a reliable one. We standardize the things that can be standardized — paint colors across the portfolio, turn-package fixtures, before-and-after photo documentation, weekly written progress reports, and the notification cadence to residents — and we sequence the things that cannot be standardized (envelope by building, phasing around resident usage, weather windows for exterior work) with realistic schedules that hold.
What we build
SCOPE- 01Turn-work standardization
- 02Common-area renovations
- 03In-unit kitchen + bath
- 04Envelope + roof upgrades
- 05Tenant-occupied protocols
- 06Phased delivery
Phased process
PROCESS- 01
Scope walk & cap-ex review
Walk the property with the operator or HOA board, review the reserve study or cap-ex schedule, prioritize scope, and develop a bid package with clear specifications and unit pricing for the work the operator is repeating.
- 02
Permit pathway & code review
Determine which work requires permits (envelope, structural, fire/life-safety, mechanical upgrades) and which is maintenance. Multifamily over 3 units routes through the IBC commercial permit track, not residential. We file the permits as contractor of record.
- 03
Resident & board communication plan
Pre-construction notification, weekly resident updates, posted hours of work, a hotline for issues. For Seattle properties subject to RRIO, we align with the property manager on inspection-readiness during the work.
- 04
Phased execution by building
Envelope and common-area work phased by building so the community remains functional. Unit turns run on a parallel track in any vacant units.
- 05
Standardized unit turn package
Paint, flooring (typically commercial-grade LVT), cabinet and fixture replacement or refresh, appliance swaps, and a standardized punch list per unit. Crews trained to the package so per-unit turn time stays predictable.
- 06
Documentation & photo close-out per unit
Before-and-after photos per unit, GFCI and smoke/CO verification per WA RCW 19.27.530, signed walkthrough with the property manager, and warranty package per work area.
- 07
Capital project close-out
Final building inspections per the AHJ, board walkthrough on HOA projects, owner walkthrough on private ownership, warranty package, and as-built drawings for envelope and structural work.
Spec sheet
SPEC- +Standardized paint colors (typically one to two across a property)
- +Commercial-grade LVT or LVP flooring, scratch- and moisture-resistant
- +Mid-range cabinet packages (shaker or slab, white or neutral) selected for repeatability
- +Quartz or laminate counters depending on rental tier
- +Standard fixture and appliance packages, ENERGY STAR where utility rebates apply
- +Fire-rated wall and floor assemblies per IBC where work touches them
- +Code-compliant exit signage, fire alarms, and smoke/CO devices per current code
- +Envelope: rain-screen siding assemblies, roof membrane systems, deck waterproofing, balcony resurfacing per scope
- +ADA-path-of-travel considerations on common-area renovations where required
Cost drivers
COST- Unit count and standardizationPer-unit cost drops meaningfully at scale (50+ units in a single package) because the trade crews stabilize and the finish package is repeated. Smaller turn packages cost more per unit.
- Tenant-occupied vs vacant workVacant turns move 30–50% faster than occupied in-unit work. Occupied work requires more notification, access coordination, and protection labor.
- Common-area renovation scopeLobby, corridor, fitness, leasing-office work can range from a cosmetic refresh to a full reconfiguration; mid-range PNW common-area scope is a meaningful five- to six-figure line item.
- Envelope scope and weather windowRoofing, siding, and exterior painting are weather-dependent in the PNW. Compressed scheduling into spring-fall windows raises labor cost; off-season work raises material-protection cost.
- Phasing requirements (occupied buildings)Phased work is typically 10–20% more than equivalent all-at-once work, but is usually required for occupied buildings and HOAs.
- Insurance-funded vs reserve-funded workInsurance scope (post-storm, water, fire) is bid to insurance pricing systems and follows the adjuster workflow; reserve-funded work is bid to spec on the open market. Different processes, different timelines.
Codes & permits
COMPLIANCE- International Building Code (IBC) — WA adoption
Multifamily buildings of 3+ units fall under the IBC (with Washington amendments) for fire-rated assemblies, exit-path widths, accessibility, and life-safety systems. Adopted statewide by the WA State Building Code Council.
- WA Residential Landlord-Tenant Act — RCW 59.18
Defines the required notice periods, access rules, and habitability standards that govern any work performed inside tenant-occupied units in Washington. Our access and notification protocols follow this statute.
- Seattle RRIO — Rental Registration & Inspection Ordinance
Seattle rental properties must be registered and pass periodic inspections; envelope and unit-turn scopes are typically coordinated with the property manager's RRIO calendar.
- WSEC-C — Energy code for multifamily 4+ stories and certain renovations
Multifamily buildings of 4+ stories and renovations crossing certain thresholds fall under the commercial WSEC pathway. Triggers envelope, mechanical, and lighting upgrades on qualifying scopes.
- RCW 64.34 & 64.38 — Condo and HOA acts
Govern reserve-study, board-authority, and disclosure requirements that frame HOA / condo capital-improvement work. We follow the association's governing documents and bid process.
- Smoke & CO alarms — RCW 19.27.530
Hard-wired interconnected smoke alarms in all sleeping areas and on every floor; CO alarms outside each sleeping area. Verified at every unit turn.
Is multifamily remodeling the right call?
- →You operate an apartment building or small multifamily portfolio and need predictable unit-turn cycle time at standardized cost
- →You manage an HOA or condominium association working through a reserve-study capital improvement plan
- →You are a property manager handling envelope or common-area renewal across a small portfolio and want one accountable contractor
- →You are an owner of a small multifamily property planning a value-add renovation between hold periods
- →You have a post-loss insurance claim (water, storm, fire) on a multifamily property and need a contractor who can document scope and work the adjuster process
- →You need a contractor familiar with Washington landlord-tenant law and Seattle RRIO requirements who will not stumble on tenant-occupied work
Multifamily questions
FAQQ.01
How fast can you turn a vacant unit?
A standard two-bedroom unit turn — paint, flooring, fixtures, light repair — typically completes in 5–10 days with our crews. A kitchen and bath refresh on the same unit adds 3–7 days. Per-unit turn time stabilizes with portfolio scale because the crews repeat the same package; smaller one-off turns take longer per unit.Q.02
Do you work in occupied buildings while tenants are in their units?
Yes. Common-area renovations, envelope work, and in-unit upgrades in occupied units are all routine for us. We follow Washington landlord-tenant law (RCW 59.18) on notification and access, post hours of work, and run a hotline for resident issues. For Seattle properties, we coordinate the work with your RRIO calendar.Q.03
Can you handle HOA or condominium reserve-study capital projects?
Yes. We participate in formal bid processes, deliver detailed scope and unit pricing, and work directly with property managers and association boards on owner communication, phased execution, and close-out. Our work follows the requirements in RCW 64.34 and 64.38 and the association's governing documents.Q.04
Do you build ground-up multifamily?
We build small attached residential (townhomes, cottage clusters, small stacked flats) as part of our Small Residential Development practice at /services/small-residential-development. Larger ground-up multifamily projects — wood-frame mid-rise or concrete podium and above — are outside our current self-perform scope, and we will refer you to a specialized multifamily GC if that is what you need.Q.05
Can you work with our insurance adjuster on a storm or water claim?
Yes. We document damage scope, work to insurance pricing systems (Xactimate) where required, and coordinate with adjusters through the rebuild. Most large PNW multifamily properties carry one or more wind, water, or fallen-tree claims per year.Q.06
What permits are required for unit-turn and renovation work?
Cosmetic in-kind work (paint, flooring, cabinet swap with no plumbing or electrical changes) generally does not require a permit. Plumbing relocation, electrical upgrades, structural openings, fire-alarm modifications, and envelope work do. We make the permit-needed call up front and file as contractor of record where required. For Seattle multifamily, the permit path runs through SDCI's commercial / multifamily track, not residential.Q.07
What size portfolios can you handle?
We have run packages across portfolios up to roughly 200 units in a single coordinated program (envelope renewal, unit turn cycles, common-area work). Larger or geographically distributed portfolios are typically broken into phased packages so the scope stays accountable.
SOURCE_LAYER / Official citations
Where these claims come from
Permit, code, and middle-housing statements on this page are sourced to the official publishers below. Click any title to read the primary document. Dates indicate when each URL was last hand-verified by an editor.
- International Building Code (IBC) Adoption — Washington
Adoption of the IBC (with WA amendments) governs multifamily buildings of 3+ units, including fire-rated assemblies and accessibility.
Washington State Building Code CouncilVerified 2026-06-08 - Washington Residential Landlord-Tenant Act — RCW 59.18
Required notice periods and access rules that govern any work performed in tenant-occupied units.
Washington State LegislatureVerified 2026-06-08 - Rental Registration & Inspection Ordinance (RRIO) — Seattle
Seattle's rental inspection and habitability standards that envelope and unit-turn scopes must satisfy.
Seattle Department of Construction & InspectionsVerified 2026-06-08 - Washington State Energy Code — Commercial / Multifamily 4+ Stories
WSEC-C applies to multifamily structures of 4+ stories and to envelope / mechanical upgrades crossing certain thresholds.
Washington State Building Code CouncilVerified 2026-06-08 - Washington Condominium Act (RCW 64.34) & HOA Act (RCW 64.38)
Reserve-study, board-authority, and disclosure requirements that govern HOA / condo capital improvement work.
Washington State LegislatureVerified 2026-06-08 - Seattle SDCI — Multifamily, Commercial, and Mixed-Use Permits
Permit pathway for capital improvement, envelope, and renovation work on multifamily buildings of 3+ units in Seattle.
Seattle Department of Construction & InspectionsVerified 2026-06-08
This page is informational, not legal advice. Specific land-use, permit, or HB 1110 questions about a particular parcel should be directed to the appropriate AHJ or a Washington-licensed attorney.
Official resources & sources
- Source ↗IBC — International Building Code
- Source ↗WSEC 2021 Residential Energy CodeEnvelope, HVAC, hot-water and air-sealing requirements
- Source ↗WA HB 1110 — Middle housing lawStatewide middle-housing zoning preemption
- Source ↗WA HB 1337 — ADU statewide rulesTwo-ADU baseline, no owner occupancy, parking limits
- Source ↗WA Dept. of Commerce — ADU resources
- Source ↗WA L&I contractor license lookupVerify Golden State ADU Builders Inc · GOLDESA747LZ
- Source ↗Washington State Building Code CouncilStatewide adopted codes (IRC, IBC, WSEC)
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INTERNAL_LINKS / Deep Map