Need more living space? Based in Mountlake Terrace, WA, we build custom room additions and expansions that blend seamlessly with your home across Lynnwood, Edmonds, Shoreline, and Bothell.
A great addition should feel entirely organic, not like an afterthought. G.B.L Construction LLC handles the full structural lifecycle — from architectural planning and foundation pouring to tie-in framing, exterior matching, and high-end interior finishes.
We build single and multi-story additions engineered strictly to local building codes and engineering plans.
Expand your main level footprint with family room extensions, kitchen bump-outs, expansive formal dining rooms, or dedicated home offices.
Double your existing floor space without sacrificing yard area through reinforced structural framing, new staircases, and second-floor roof systems.
Filled with natural light through high-efficiency insulated windows, vaulted tongue-and-groove ceilings, and dedicated heating and cooling.
Self-contained guest living units complete with private entrances, full kitchens, bathrooms, bedrooms, and independent utility controls.
From architectural plans and zoning permits to structural tie-ins and final trim.
We review property lines, zoning setbacks, structural tie-in points, and utility requirements.
We provide comprehensive itemized pricing and assist with architectural blueprints and permit applications.
Excavation, concrete footings, slab or basement foundation, structural timber framing, and roof tie-in.
Matching siding, roofing, insulation, drywall, flooring, electrical, HVAC, and final inspection.
Have questions about adding space to your home? We have answers.
Call Our TeamBuilding out (ground-level addition) is generally more straightforward and allows you to remain in your home during construction. Building up (second story) is ideal when lot size or setback restrictions limit your footprint. We will help evaluate the most cost-effective option for your specific property.
Yes. We take great care to match exterior siding, brick, roof shingles, trim profiles, window styles, and interior floor heights so the addition blends seamlessly inside and out.
Depending on your current HVAC system's capacity, we can either extend your existing ductwork or install dedicated, highly efficient ductless mini-split heat pumps for customized zone climate control.
A typical room addition takes 6 to 12 weeks from groundbreaking to final walkthrough, depending on foundation type, square footage, and weather conditions.
Reach out today to discuss your vision and get a free, detailed written estimate from G.B.L Construction LLC.