OLEG & SONS · DESIGN | BUILD | REMODEL
Another Seattle home, considered from the first entrance to the last detail.
A basement apartment and a backyard cottage ask different things of a Seattle property. Start with the household you want to accommodate, then compare entrances, daylight, yard space, and service connections before choosing the right construction approach.
Seattle ADU / DADU construction · Written project scope confirmed for your property
Share your Seattle address and the way you want the space to work.
REVIEW YOUR SEATTLE PROPERTY
Begin with the part of your Seattle property that can support independent living. Compare a cottage, addition, and existing-space conversion against daylight, resident access, construction access, and the outdoor space you want to keep.
Use Seattle’s ADUniverse resources to explore the property and available plans, then compare a detached cottage with an attached or basement option. We recommend weighing private access, daylight, existing-house disruption, and the yard you want to keep before selecting a footprint.
On an established block, a side passage or alley can matter as much as the building area. Map deliveries, excavation access, the future resident’s entrance, and the relationship between new windows and neighboring homes as part of the initial design discussion.
Seattle’s ADU guidance identifies electrical service coordination and sewer capacity-charge documentation among the considerations. Review the existing electrical service and proposed utility routes alongside the floor plan so the construction scope includes more than the new living space.
Bring the address and existing plans. Confirm the applicable jurisdiction before planning your Seattle project.
BUDGET FOR YOUR SEATTLE PROJECT
Our Seattle ADU / DADU construction rate is $330 per square foot. Confirm the building, site preparation, utilities, finishes, permits and exclusions in your written proposal before comparing project budgets.
800 sq ft × $330
Seattle floor-area illustration at $330 per square foot. Your written proposal confirms inclusions, site work, fees, allowances and taxes.
Review the Seattle scope ↗On a Seattle lot, the approach to the building matters. Review delivery access, electrical service, sewer routing, and the relationship to the main house alongside the new rooms.
| Scope item | What your proposal should clarify |
|---|---|
| Design & engineering | Architect and engineering responsibilities, site documents, and any designer’s plan-license fees. |
| Permits & City fees | Applications, review fees, required permits and who is responsible for each cost. |
| Site preparation | Existing structures, demolition, excavation, access, drainage and any site-specific work. |
| Utility connections | Water, sewer, electrical service, connection routes and any required upgrades. |
| Interiors & selections | Cabinetry, surfaces, flooring, fixtures, appliances and the allowances for your selections. |
| Taxes & changes | Tax treatment, exclusions, payment milestones and how changes are priced and approved. |
The Seattle calculator illustrates floor area × $330. Confirm your property-specific total and the items included in your written agreement.
THE WORK BEHIND THE PROMISE
The Seattle and Redmond remodeling examples provide evidence of completed interior work. Review the visible finishes and layouts as references while developing a separate, property-specific ADU scope.
SEATTLE · COMPLETED REMODELKitchen, dining connection and bathroom details, brought together through cabinetry, tile, storage and lighting.
Explore our Seattle project ↗
REDMOND · COMPLETED REMODELA kitchen, bathrooms, fireplace and interior updates, with preparation and finished spaces documented in the gallery.
Explore the full renovation ↗These are completed remodeling projects, not ADU case studies. Finished photos have lighting enhancements; explore each project for its documented scope.
THE SEATTLE DESIGN COLLECTION
The Seattle ADUniverse reference contains 183 entries, including 31 with plans. Use it to compare layouts, roof forms, and room relationships. Catalog inclusion or a pre-approved plan does not approve your property; the Seattle site, proposed use, and permit requirements still need review.
These 10 designs are listed as pre-approved in Seattle’s gallery. Site-specific permitting and a plan license from the designer are still required.
No designs match these filters. Try another size or search term.
We’ll help you explore access, site conditions, layout and construction for your property.
Seattle’s pre-approved designation is specific to the City’s program. For Bellevue or another nearby city, confirm the applicable local review and approval path. Source: City of Seattle · ADUniverse gallery. Designs and images belong to their respective creators. These are independent architects’ designs, not Oleg & Sons completed projects. Availability, approval and licensing must be confirmed with the City and designer. Catalog checked October 22, 2026.
Seattle design status is separate from approval of your property. Confirm current eligibility, a plan license and the site-specific permit requirements with SDCI.
DESIGNED AROUND REAL LIFE
These AI-generated interior concepts explore light, storage, and circulation in a compact residence. They are design ideas to discuss, not photographs of completed ADUs or a promised project specification.
AI design conceptTest a kitchen and lounge arrangement that leaves an easy path from the entrance to the private rooms, with storage concentrated where it helps daily routines.
AI design conceptExplore window positions and wardrobe storage together, then adjust the concept to the actual lot orientation and the privacy relationship with the main house.
AI design conceptConsider the shower, vanity, door swing, and towel storage as one layout. The final dimensions and accessible features depend on the agreed design and applicable requirements.
AI-generated design concepts for inspiration. Layouts and finishes are developed for your property; these are not completed-project photographs.
START WITH YOUR PROPERTY
Choose the construction approach after comparing the existing home with the available site. Each option changes privacy, utility routes, and how much the main household experiences construction.
Tell us about your propertyExplore a cottage with its own entrance and a clear outdoor relationship to the main house. Resolve side-yard or alley access before treating a preferred plan as the right fit.
Consider an addition or connected unit where independence matters but a shared building makes sense. Coordinate the entrance, sound separation, and the main home’s remaining circulation.
Compare a basement, garage, or interior conversion with new construction. Existing conditions, daylight, ceiling space, and required upgrades determine whether reuse offers a practical route.
FROM YOUR SEATTLE ADDRESS TO HANDOVER
The sequence starts with the property and ends with an understood, usable residence. Timing depends on design decisions, review requirements, existing conditions, and the construction scope.
Gather records, identify the proposed living arrangement, and compare attached and detached options against access and the existing house.
Develop the layout, entrances, windows, outdoor space, and utility routes together. Use catalog references as a starting point for site-specific choices.
Prepare the appropriate Seattle permit submissions and supporting information. Address review comments before committing to work that requires approval.
Coordinate site preparation, services, structure, and interior work against the approved documents, with selections and changes recorded as construction progresses.
Complete the required inspections and agreed closeout items, review the residence’s systems, and provide the project information needed for everyday use.
The design team, reviewing authority, site conditions and material lead times shape your Seattle sequence. We refine milestones as the documents and permit path become clear, then confirm the construction schedule in the agreement.
BEFORE YOU BEGIN
Seattle has its own ADU terminology, tools, and permit pathways. These answers explain useful starting points; your parcel and proposed work determine the final requirements.
Ask us your questionAn AADU is within or attached to the main home; a DADU is a separate building on the same property. A basement conversion, addition, and backyard cottage therefore begin with different existing-building and site questions.
No. ADUniverse offers pre-approved plans and a property exploration tool, but the proposed project still needs the appropriate permits and review of site conditions. A plan selection should follow a property review, not replace it.
Seattle provides an establish-use construction permit route for an existing ADU. The work needed depends on the unit’s condition and applicable standards, so start with records and an assessment before assuming the space is already compliant.
Seattle’s historic neighborhood records show how streetcar-era development shaped some narrow lots and pedestrian entrances. On those properties, we recommend resolving resident access, construction access, and outdoor privacy early; the best location is specific to the parcel.
For Seattle and Bellevue, our published ADU / DADU construction rate is $330 per square foot. For your Seattle property, the written proposal confirms the included work, site conditions, utility work, allowances, exclusions, fees and taxes. Floor-area arithmetic alone is not a total-project quote.
Oleg & Sons Bellevue Home Remodeling provides a 2-Year Workmanship Warranty. For your Seattle project, we review the agreed construction responsibilities, final walkthrough and applicable warranty terms in the project documentation.
YOUR PROPERTY. YOUR PRIORITIES.
Share the address, the space you are considering, and who the new home should serve. Available plans and property records help make the first discussion more useful.
(425) 275-7945Owner operated since 2013
Washington contractor OLEGSSP754Q6 · 2-Year Workmanship Warranty
Review your project details, then choose a consultation time. Your notes will carry into the booking.
800 sq. ft. × $330 per sq. ft.
Floor-area illustration only. Your written proposal confirms the work, site costs, allowances, fees, and taxes.
Your address and project notes will be carried into our consultation calendar. Confirm your details there to complete the booking.