Skip to main content Skip to content Room additions, second stories, primary suites, and bump-outs designed to match your home. Woodland Construction Group builds additions across Lake Oswego, one accountable team from first sketch to final walkthrough.
Adding on to your home in Lake Oswego, Oregon? A home addition expands your footprint with a new room, a second story, a primary suite, or a bump-out, and ties the new space into the home’s structure, systems, and finishes.
Because an addition touches foundation, framing, roofing, and code, and because Lake Oswego runs its own permit and review process, the contractor you choose controls the outcome. The right partner protects your budget, holds your schedule, and builds an addition that reads as original.
Woodland Construction Group designs and builds additions across Lake Oswego under one contract, so design, permitting, and construction never get handed off.
Home additions in Lake Oswego commonly run $90,000 to $400,000+ in 2026, depending on size, foundation work, and whether it is a single-story addition or a second story.
Additions add bedrooms, suites, and living space when moving up within Lake Oswego is expensive, with a detached-home median near $1.1 million and limited inventory. Adding on keeps families on their lot, in their neighborhood, and inside the top-ranked Lake Oswego School District.
Construction & design experience in the metro
Homes transformed across Lake Oswego and the metro
Across Google, Houzz & Yelp reviews
Craftsmanship warranty on every project
In supply-constrained Lake Oswego, with a detached-home median around $1.1 million and the state’s #1-ranked school district, buying a larger house often means more money, a smaller lot, or a different neighborhood. Adding on keeps families on the lot they chose, near George Rogers Park, the lakefront, and downtown’s “A” Avenue, while gaining the space they actually need.
The addition pictured here is a real Woodland Construction Group project built in Lake Oswego. A good addition reads as part of the original house: we match rooflines, siding, window styles, and proportions so it never looks bolted on, and we carry interior finishes through so the new space flows with the old.
Pair the lifestyle gain with added livable square footage that supports home value, and an addition delivers both an immediate upgrade and a long-term return. See how it scales on our whole-home renovation page.
Woodland Construction Group – 18 Years Experience – Serving Lake Oswego, Oregon
Our team of licensed contractors designs and builds room additions, second stories, and primary suites across Lake Oswego, matching new construction to the existing home and managing the full City of Lake Oswego permit and review process.
A well-matched addition lets you keep your Lake Oswego lot, neighborhood, and top-ranked schools while gaining the bedrooms, suite, or living space your family needs, without the cost and limited inventory of moving up.
Six types of addition show up in almost every Lake Oswego project we build. Each one is engineered to match the existing home and fit how the space will actually get used.
New bedrooms, offices, family rooms, and dining spaces tied cleanly into the existing structure, foundation, and roofline so the home gains square footage without losing its character.
Adding a level on top of a single-story Lake Oswego home, starting with a structural and foundation assessment to confirm the existing house can carry the new floor.
A private owner’s retreat with bedroom, spa bath, and walk-in closet, added where many older Lake Oswego floor plans never had one, sized and finished to feel original.
Pushing out an exterior wall to open up a kitchen or living area, opening compartmentalized mid-century and ranch plans into the connected spaces families want.
Light-filled additions that connect the home to its yard and views, built for Lake Oswego’s wooded lots and rainy climate with proper glazing and ventilation.
Matching foundations, framing, siding, rooflines, and proportions to the existing home so the addition ties in structurally and reads as part of the original house.
How We Work
One team, one contract, from the first measurement to the final walkthrough, with no handoffs between designer, builder, and trades: design and 3D layouts, material selection, permitting and inspections, careful demolition, licensed construction, and a final walkthrough, all backed by our 1-year craftsmanship warranty.
See our full design-build processA look at how we add square footage that reads as original across Lake Oswego and the metro.
Walk through every line that shapes the number, from foundation and framing to siding, roofing, and second-story structural work, with a calculator built on real project data.
Engaging with Woodland for our home extension was a great decision. They were attentive to our vision, offered valuable insights, and completed the project on time. Their commitment to quality and craftsmanship is truly impressive.
A huge thank you to Woodland Construction Group for the beautiful job they did on our home extension. High-quality craftsmanship throughout.
Woodland Construction Group is an expert in their field. We are very satisfied with their work.
Timelines, cost, the City of Lake Oswego permit process, and what to expect in 2026. If your question is not here, call us. We would rather answer it directly.
A typical Lake Oswego room addition takes 4 to 7 months from design through final walkthrough. Larger projects like second-story additions or primary suites run 7 to 12 months. Design and the City of Lake Oswego permit and review process account for a meaningful share of that time, especially when Pre-Application Conference, Development Review, or Sensitive Lands review apply. We set a detailed timeline during design and hold to it through construction.
In Lake Oswego, home additions commonly run $90,000 to $400,000 or more in 2026, depending on size, foundation work, and whether it is single-story or a second story. A modest bump-out sits at the lower end, while a full second story or primary-suite addition with matched siding and rooflines sits higher. Site factors like steep slopes, tree-protection requirements, and Sensitive Lands review can also affect the budget. You receive an itemized estimate during design.
Additions in Lake Oswego go through the City of Lake Oswego Planning and Building department, not the City of Portland. Most major additions require a Pre-Application Conference and Development Review, followed by building permits and plan review. Lots near creeks, Tryon Creek, wetlands, or steep wooded slopes may need Sensitive Lands review before grading or demolition. Lake Oswego’s tree-protection ordinance means any tree 6 inches or larger in diameter needs a removal permit, and some removals require a replacement tree. Woodland Construction Group manages all of it.
Often, yes. A second-story addition starts with a structural and foundation assessment to confirm the existing footings, framing, and load paths can carry the new floor, or what reinforcement is needed. Many Lake Oswego homes from the 1950s through 1970s were not built for a second level, so we evaluate the structure first and design the addition to match the home’s rooflines and proportions. We confirm feasibility before you commit to the full project.
Yes. A good addition reads as original, not bolted on. We match rooflines, siding, window styles, trim, and proportions to the existing home, and we carry interior finishes through so the new space flows with the old. Whether your home is Mid-Century Modern, ranch, Tudor Revival, or Craftsman, the goal is an addition that looks like it was always there.
They can. Lake Oswego zoning sets setbacks and maximum lot coverage that define where and how large an addition can be, which is one reason a Pre-Application Conference matters early. The city’s tree-protection ordinance also affects site plans: trees 6 inches or larger in diameter need a removal permit, and some require a replacement tree. We assess zoning, setbacks, coverage, and trees during design so the addition is feasible before drawings are finalized.
For many families, yes. With a detached-home median around $1.1 million and a supply-constrained market, moving up within Lake Oswego is expensive and inventory is limited. Adding on keeps you on your lot, in your neighborhood, and inside the top-ranked Lake Oswego School District while gaining the bedrooms, suite, or living space you need. A well-matched addition also adds livable square footage that supports home value.
Family-owned and based in Northwest Portland, we design and build home additions across Lake Oswego and the nearby communities.
Keep Exploring
Book a free in-home consultation. We will assess the structure, talk through layout and budget, walk the Lake Oswego permit path, and give you an itemized estimate, with no pressure and no handoffs.
