With over a decade of experience, we design and build ADUs and custom home additions that expand your living space, add value, and blend seamlessly with your home’s style.
Newcastle Custom Home Additions and ADU Building Services
Professional Builder
- Licensed & Insured Local Contractor
- Expertise in Permits & Zoning
- Fixtures, Materials & Labor Included
- Custom Home Addition & ADU, DADU Solutions
- Quality Materials & Sustainable Practices
- Reliable, Experienced Craftsmanship
- Full Design & Project Planning
5 Star Rated Newcastle, WA Construction Company
14
Years of
Experience
+150
Completed
Projects
FREE QUOTE FOR YOUR ADDITION OR ADU
Professional Addition & ADU Contractor
Seattle’s Eastside, WA
Our Comprehensive Addition & ADU Services Include
ADU Builder in Newcastle: With over a decade serving Newcastle homeowners, we bring proven craftsmanship to every Accessory Dwelling Unit project. From solid structural work to precise finishes, our team builds attached and detached ADUs designed for durability, comfort, and lasting value.
Home Additions in Newcastle: We specialize in high-quality home additions that meet practical needs while upholding our standards for fine construction. Whether you need extra bedrooms, a functional home office, or a dedicated in-law suite, our local knowledge and hands-on approach ensure a result you’ll appreciate for years.
- Garage Conversions
- Sunrooms
- In-law Suites
- Guest Suites
- Home Offices
- Basement Conversions
- Second Story Additions
- Kitchen Extensions
- Bathroom Additions
- Detached ADUs
- Attached ADUs
- Energy-Efficient Upgrades
Let's Talk About Your Remodeling Project
Complimentary Estimate and Expert Guidance from experienced Professionals.
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Our ADU and Addition Services
Attached ADUs
Connected to the main house for multi-gen living or rental income. Designed for a seamless tie-in and code compliance.
- Directly attached to home
- Shared Wall Structures
- Integrated Utilities
- Space-Efficient Layouts
Detached ADUs
Stand-alone backyard cottages for guests or rental. Built for privacy, durability, and local zoning compliance.
- Stand-Alone Structures
- Private Entrances
- Independent Utilities
- Flexible Use Options
Home Additions
Increase square footage with custom additions that match your home’s style and boost long-term value.
- New Bedrooms
- Home Offices
- In-Law Suites
- Seamless Integration
Home Extensions
Targeted expansions: kitchen, bathrooms, living, or sunroom planned for comfort, light, and energy efficiency.
- Enlarged Kitchens
- Spacious Living Rooms
- Added Sunrooms
- Seamless Integration
Why Choose BLC Remodeling LLC for Your Newcastle Home Additions and ADUs?
Licensed and Insured Newcastle Contractor
We maintain full licensing and insurance for projects in Newcastle, ensuring compliance with Washington State building regulations and a construction process you can trust.Knowledge of Newcastle’s Residential Development Rules
Newcastle’s combination of established neighborhoods and new developments calls for careful design integration. We work within local zoning guidelines to create additions and ADUs that enhance both curb appeal and functionality.Spaces Built for Daily Living
From home offices to multi-room expansions, we design additions that improve daily comfort and efficiency while complementing the existing structure of your home.Durable Construction for Long-Term Value
Our methods include solid wood framing, precision joinery, and the use of materials suited to the Pacific Northwest’s climate, ensuring your investment lasts for decades.Over a Decade Serving Newcastle Residents
Since 2011, we have built in neighborhoods across Newcastle, delivering projects that respect community character while adding modern comfort and value.
Schedule an Estimate
Achieve Your Dream Home With Our Process
Simplified Newcastle Home Extension Process
1.
Schedule a Consultation
2.
In-Home Assessment
3.
Receive a Detailed Quote
4.
Schedule and Begin Work
Start Your Home Transformation Today
Schedule Your Newcastle ADU or Addition Estimate
Call us anytime, we strive to answer all inquiries within 24 hours.
Estimate Request Form
Frequently asked questions
Adding an addition to your existing home is generally more cost-effective than building a new house. Home additions make use of existing infrastructure and utilities, which can significantly reduce costs. However, the total expense will depend on the size and complexity of the addition, as well as the materials used.
The cheapest type of home addition is typically a single-room extension, such as a sunroom or a small bedroom. These additions require less structural work and fewer materials compared to multi-room additions or second-story expansions. Costs can be further minimized by choosing cost-effective materials and designs.
The timeline for home additions varies depending on the project’s scope and complexity. On average, a small addition like a single room can take 3-4 months, while larger projects, such as adding a second story, can take 6-9 months. Detailed planning and efficient project management are crucial to staying on schedule.
Newcastle’s ADU requirements include:
- Size: No larger than 1,000 sq. ft. or 40% of the principal dwelling’s floor area.
- Parking: One off-street parking space required.
- Compliance: Must follow all applicable construction and zoning regulations.
Visit the Newcastle City Government website for more details.
Service Areas
Other Service Areas
Don’t see your neighborhood listed? No problem! We are eager to hear about your project. Call us today, and let’s discuss how we can help. Proudly serving homeowners throughout Eastside and Greater Seattle!