Feasibility before floor plans
Hiring an ADU builder only pays off when feasibility comes first, so we check setbacks, utilities, and access before committing to a floor plan.
A small building with a full set of decisions
ADU Building Services Designed Around Your Property and Lifestyle
RT Signature Homes Design & Build - Kitchen & Bathroom Remodeling provides ADU Building Services that create functional living spaces for family, guests, rental opportunities, and changing household needs.
Call (206) 775-8077Design inspiration imagery · Redmond-based service
Project fit
Design a Detached ADU for Privacy and Independent Living
A detached accessory dwelling unit adds private, self-contained living space on your property, ideal for extended family, guests, a home office, or rental income. RT Signature Homes plans each ADU around your lot, setbacks, and utilities, so the new unit offers independence and privacy while fitting comfortably with your main home.
Typical scope
- Site, setback, access, and feasibility review
- Attached, detached, and conversion design
- Utility, drainage, energy, and structural coordination
- Permitting and jurisdiction-specific documentation
- Compact kitchens, bathrooms, storage, daylight, and privacy
Why choose us
Why Choose Us for Our ADU Building Services
Matched to the property
Attached, detached, and garage-conversion units follow different paths, and we match the approach to what the property can realistically support.
One coordinated team
Because one team handles design through construction, utility connections, structure, and finishes stay coordinated rather than handed off and lost.
Residential services
Choose the scope that best matches your home.
Each service page explains the work, planning considerations, materials, budget factors, and questions that shape a useful first conversation.
deck remodeling contractor
Deck Remodeling
Deck remodeling should rebuild the structure, flashing, and drainage before the surface. RT Signature Homes coordinates framing, decking, railings, and outdoor living features so the finished deck lasts and connects to the home.
Explore deck remodeling
kitchen remodeling contractor
Kitchen Remodeling
RT Signature Homes approaches kitchen remodeling as a balance of circulation, storage, work zones, lighting, materials, and construction reality. Every visible finish depends on decisions behind the walls and inside the cabinets.
Explore kitchen remodeling
bathroom remodeling contractor
Bathroom Remodeling
Bathrooms concentrate plumbing, ventilation, electrical work, tile, cabinetry, glass, and moisture control in a compact footprint. RT Signature Homes plans those systems together so the room performs as well as it looks.
Explore bathroom remodeling
home addition contractor
Home Additions
An addition changes the structure, exterior, utilities, circulation, and relationship between old and new. RT Signature Homes coordinates those decisions as a single design-build scope.
Explore home additionsADU builder
ADU Design & Construction
Accessory dwelling units require careful coordination of zoning, access, utilities, privacy, parking, structure, and compact-space design. RT Signature Homes brings feasibility, permitting, and construction into one process.
Explore adus
custom home builder
Custom Home Building
A custom home is a sequence of thousands of connected decisions. RT Signature Homes organizes feasibility, design, selections, permitting, estimating, construction, and closeout around a single accountable delivery process.
Explore custom homesDesign ideas
Explore ADU Floor Plans That Support Modern Living Needs
The right floor plan makes a compact footprint feel open and livable. Smart ADU layouts balance kitchen, bath, sleeping, and living areas with storage and natural light to support the way people live today.
ADU Design Ideas
These ideas explore compact, efficient floor plans with well-placed kitchens, bathrooms, storage, and daylight that make an ADU comfortable for everyday living.
Explore the gallery
Compact living
Plan an ADU Layout That Maximizes Every Available Square Foot
In a smaller footprint, every square foot has to work, so we plan the relationships between cooking, bathing, sleeping, storage, and living areas with care.
Built-in storage, efficient circulation, and well-placed windows make a compact ADU feel open and deliberate rather than cramped or reduced.
Space conversions
Convert Existing Spaces Into Comfortable Accessory Dwelling Units
An underused garage, basement, or outbuilding can often become a comfortable accessory dwelling unit, reusing existing structure while adding independent living space.
A conversion still requires careful attention to insulation, moisture control, ventilation, electrical, and plumbing, so we assess the existing building before planning the new layout.
Garage conversions
Converting a Garage Into Living Space or an ADU
An underused garage can often become comfortable living space, from a home office or guest room to a fully independent accessory dwelling unit. The right path depends on your goals and what the structure and lot can support.
It is worth knowing the distinction: converting a garage into extra living space for your own household is different from a conversion that creates a separate, self-contained ADU with its own entrance, kitchen, and bathroom. A garage conversion does not automatically qualify as an ADU — that depends on zoning, utilities, parking, and local code.
Either way, we assess insulation, ventilation, moisture, ceiling height, utilities, and the applicable permits before design, so the converted space is comfortable, code-ready, and genuinely usable year-round.
How the work moves
A process that keeps decisions ahead of construction.
Discovery and site assessment
We clarify goals, review existing conditions, identify constraints, and determine what needs deeper investigation before a scope is written.
Design and pre-construction
Layout, materials, trade requirements, permits, allowances, schedule factors, and decision deadlines are coordinated into one buildable plan.
Construction and completion
The work is sequenced, protected, inspected, communicated, and closed out with a final walkthrough and documented completion items.
Budget and schedule orientation
Scope the variables before suggesting a number.
Useful early guidance identifies what changes the investment and timeline. A responsible project range follows an assessment of the property, scope, finish expectations, and delivery constraints.
Common factors
- Existing structural and mechanical conditions
- Project size, layout changes, and finish level
- Permit, engineering, and design requirements
- Material availability and product lead times
- Site access, protection, and project sequencing
Local coverage
Find remodeling services for your community.
Explore local planning and all ten residential service lines across 30 communities around Redmond.
- Redmond remodeling services
- Bellevue remodeling services
- Kirkland remodeling services
- Sammamish remodeling services
- Woodinville remodeling services
- Issaquah remodeling services
- Bothell remodeling services
- Newcastle remodeling services
- Mercer Island remodeling services
- Renton remodeling services
- Seattle remodeling services
- Shoreline remodeling services
- Lake Forest Park remodeling services
- Kenmore remodeling services
- Lynnwood remodeling services
- Mountlake Terrace remodeling services
- Brier remodeling services
- Mill Creek remodeling services
- Everett remodeling services
- Snohomish remodeling services
- Duvall remodeling services
- Carnation remodeling services
- Fall City remodeling services
- Snoqualmie remodeling services
- North Bend remodeling services
- Medina remodeling services
- Clyde Hill remodeling services
- Hunts Point remodeling services
- Yarrow Point remodeling services
- Beaux Arts Village remodeling services
Questions homeowners ask
ADU Design & Construction FAQs
What can an accessory dwelling unit be used for?
An accessory dwelling unit can provide independent living space for extended family, adult children, guests, or tenants. Depending on the design and applicable regulations, it may include a bedroom, bathroom, kitchen, and separate entrance to support everyday living.
Can an ADU be built in my backyard without affecting my existing outdoor space?
An ADU may fit into part of a backyard, but the available building area depends on property dimensions, setbacks, access, utility connections, and local regulations. Planning the footprint carefully can help balance the new living space with the outdoor areas you want to retain.
What is the difference between a detached ADU and a garage conversion?
A detached ADU is a separate residential structure, while a garage conversion adapts an existing garage into living space. A conversion may use some existing structural elements, but insulation, moisture control, electrical systems, plumbing, and other upgrades may be necessary.
Does an ADU need its own kitchen and bathroom?
The required facilities depend on the intended use and applicable local regulations. A self-contained ADU commonly includes a kitchen or kitchenette, bathroom, sleeping area, and living space. These features should be considered early because plumbing and utility requirements affect the design and construction plan.
What should be evaluated before starting an ADU construction project?
Begin by reviewing property dimensions, zoning rules, setbacks, access, utility capacity, drainage, and potential foundation requirements. Establishing the intended use and approximate size also helps guide the floor plan, budget, permitting process, and selection of suitable construction features.
Start a practical conversation
Find out what the property can support.
Share the address, intended use, and what you already know about the lot or existing structure.