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Add Space Without Leaving Your Property

Home addition services in Kennewick, Washington and surrounding areas for room expansions, second-story builds, and structural extensions.

When your household outgrows the square footage you have in Kennewick, Pasco, Richland, or a surrounding area, moving to a larger home is one option. Adding onto your current house is another. Home additions let you stay on your property while gaining the extra bedrooms, office space, or living area you need. You see the new structure rise alongside the existing roofline, then watch it get tied into your home with matching siding, windows, and interior finishes.


Magnitude Construction handles room additions, second-story expansions, and structural extensions that expand living space without requiring relocation. The work includes foundation, framing, utilities, and interior finishes, all designed to integrate seamlessly with your existing architecture. This service is ideal for growing households or families whose needs have shifted since they first moved in. Every addition requires navigating zoning and setback requirements, which vary depending on lot size and neighborhood rules in Kennewick and neighboring communities.


If you are considering an addition to your home, contact us to review your property and discuss how much space can realistically be added within local regulations.

What Happens During Foundation and Framing Stages

In Kennewick, an addition starts with excavation and foundation work that matches the depth and reinforcement of your existing home. You will see concrete poured and cured, then framing that extends your roofline and ties into the current structure at load-bearing points. Utilities are routed through walls before insulation and drywall go up, so electrical, plumbing, and HVAC reach the new space without visible conduit running along ceilings.


Once the addition is finished, the new room looks and feels like it was always part of the house. Flooring transitions are flush, trim matches existing profiles, and paint colors flow naturally between old and new spaces. Seamless integration with existing architecture means guests cannot tell where the original structure ends and the addition begins.


The service covers all structural work, exterior finishes, and interior buildout. It does not include furniture, window treatments, or landscaping repairs around the perimeter. The goal is to deliver a fully functional space that expands your home without forcing you to relocate or settle for a layout that no longer works.

Here Are the Questions Homeowners Usually Start With

Before committing to an addition, most people want to know how zoning affects what they can build, how long the project takes, and whether the new space will match the rest of the house.

What are setback requirements and how do they affect my addition?
Setbacks are the minimum distances your structure must maintain from property lines, and they vary by zone in Kennewick. If your lot is narrow or your home is already close to a boundary, those rules limit how far you can extend.
How do you match the new roofline to the existing house?
You tie the new framing into existing rafters or trusses at engineered connection points, then extend the same pitch and overhang. Roofing and siding are selected to match color and texture so the addition blends in.
What is the typical timeline for building a room addition?
Most single-room additions take two to four months from excavation to final inspection. Second-story builds take longer because they require structural reinforcement below and more complex framing above.
Why would I choose an addition instead of finishing a basement?
An addition gives you above-grade space with natural light and full ceiling height, which basements cannot always provide. It also avoids moisture and egress issues that come with below-grade living areas.
What happens to utilities during the addition?
You will see electrical panels upgraded if needed, plumbing lines extended from existing supply and drain points, and HVAC ducts or splits added to serve the new space. All work is inspected before walls are closed up.

Magnitude Construction manages every part of the addition process, from site prep and foundation work through final trim and paint. If your Kennewick home needs more space and your lot allows it, reach out to discuss how an addition can fit your property and your household.