Redmond ADUs — Multigenerational Homes, Rental Income, Future-Proof
Redmond updated its ADU regulations in 2023 to make accessory dwelling units much easier to build — and more Redmond homeowners are now adding them. An ADU in Redmond can be a multigenerational housing solution (aging parents, adult kids), a rental income stream ($1,800–$3,500/month for a well-designed unit), or a work-from-home office with amenities that doesn't count as "home business" for tax purposes.
We're based in Redmond. We've been through the City of Redmond ADU permit process enough times to know which plan-reviewers are strict about setbacks, which are strict about utility connections, and which streamline items usually get flagged. That matters because an ADU permit in Redmond typically takes 10–20 weeks depending on scope — and the homeowners who pick the right contractor get into construction closer to 10 weeks, not 20.
Purple Heart Pros handles the full ADU lifecycle: feasibility study, design coordination, structural engineering, Redmond permits, site prep, foundation, framing, rough-ins, finish, utility hookups, and final inspection.
What Redmond ADUs Typically Cost
ADU costs in Redmond depend heavily on whether it's detached (DADU, usually new construction from the ground up) or attached (AADU, often a basement or garage conversion):
Attached ADU — basement conversion (400–700 sq ft): $120K–$220K · Attached ADU — garage conversion (300–500 sq ft): $90K–$180K · Detached ADU — small DADU (400–650 sq ft): $220K–$360K · Detached ADU — larger DADU (650–1,000 sq ft): $320K–$500K+
Detached ADUs cost more because they're full new construction: new foundation, framing, roof, utility service extensions, and typically full kitchen + bathroom. We itemize permits, engineering, utility hookups, and materials separately.
Our Redmond ADUs Process
- Free in-home consultation. We meet you at the property, walk the scope, and ask the questions that shape a real estimate.
- Written line-item estimate. No "approximately" and no allowances without ranges. You see exactly what each trade, material, and line costs.
- Scope + fixed-price contract. Change orders are documented, priced, and signed before any extra work proceeds.
- Permits & inspections. We pull Redmond permits directly and coordinate all city inspections through project completion.
- Construction. Weekly progress updates, jobsite kept clean, respectful of neighbors and HOAs.
- Punch list & walk-through. We fix every item flagged during final walk-through before you sign off.
- Warranty. Written craftsmanship warranty on all labor; manufacturer warranties on materials pass directly through to you.
Redmond Permits, Codes & Local Specifics
Redmond's ADU regulations (updated 2023) have made many things easier, but the permit process is still detailed. City of Redmond Planning & Community Development reviews:
- Building Permit for the ADU structure (typical review: 10–20 weeks).
- Electrical, Plumbing, Mechanical permits separately.
- Site Plan Review for DADUs — confirming setbacks, lot coverage, height limits.
- Utility Service Connection Permits (water, sewer, electrical) — often the longest-lead-time item.
Key Redmond ADU rules (2026):
- One ADU per lot (either attached or detached, not both in most zones).
- Max size: typically 1,000 sq ft for a DADU, or up to 40% of the primary residence for an AADU.
- Height limit: 18 feet for a single-story DADU, 25 feet for two-story (with setback adjustments).
- Setbacks: 5 feet side and rear for DADUs in most residential zones.
- Parking: 1 additional off-street parking space required (waived in some transit-accessible zones).
- Owner occupancy: Redmond removed the owner-occupancy requirement in 2023 — you can rent the ADU and the main house.
If your Redmond home is in an HOA (Education Hill, Novelty Hill, Redmond Ridge, Overlake Park, Trilogy, Redmond Farms), HOA architectural review is also required — many HOAs have specific ADU design guidelines.
Why Redmond Homeowners Choose Purple Heart Pros
- Veteran-owned & operated. The discipline, accountability, and follow-through of military service, applied to every project.
- Licensed & insured in Washington State. WA L&I licensed general contractor, bonded, and fully insured — we share proof on request.
- Local to East King County. Based in Redmond, we know Redmond's permit nuances, HOA norms, and supply houses.
- Transparent pricing. Written line-item estimates, no surprise change orders, no pressure.
- Same-day response. We reply to every request within business hours. You'll talk to a real person, not an assistant.