When a growing family loves their Kamloops neighbourhood but has outgrown their house, the choice usually comes down to one question: move, or build up? For many homeowners on established lots in areas like Sahali, Aberdeen, or Brocklehurst, adding a second storey or a ground-floor addition keeps you in the community you know while giving you the space you actually need. It is one of the more involved projects we take on, and it pays to understand what you are signing up for before you start.
Building Up vs. Building Out
There are two main ways to add square footage to an existing home, and each suits a different lot.
Adding a second storey stacks new living space on top of your existing footprint. It is the go-to option when your lot is tight, when you want to preserve yard space, or when zoning setbacks leave you no room to expand outward. The trade-off is complexity: your existing foundation and main-floor walls have to be assessed to confirm they can carry the new load, and the roof has to come off, which means the house is exposed during a critical stretch of the build.
Building out — a ground-floor addition or bump-out — extends the footprint horizontally. It avoids the structural gymnastics of a second storey and keeps the household on one level, which matters for accessibility. The trade-off is that you give up yard, you need room within your setbacks, and you add new foundation and roofing rather than reusing what is already there.
Neither is universally cheaper. The right answer depends on your lot, your zoning, and what your existing structure can support.
What It Costs in 2026
Additions are priced by the square foot, and in the Kamloops market in 2026 you should budget realistically:
- Ground-floor addition: roughly $275 to $450 per square foot, depending on finishes and whether it includes a kitchen or bathroom.
- Second-storey addition: roughly $325 to $525 per square foot, reflecting the extra structural work, temporary weather protection, and the disruption of opening up the existing roof.
- Bump-outs and bonus rooms over a garage: often fall between these ranges.
A modest 400-square-foot main-floor addition might land around $110,000 to $180,000, while a full second storey adding 800 to 1,000 square feet can run $300,000 or more once you account for structural upgrades, a new staircase, HVAC extension, and finishing. Rooms with plumbing — bathrooms and kitchens — carry the highest per-foot cost. Your existing home's condition matters too: an older Kamloops home may need electrical panel upgrades, foundation reinforcement, or updated framing connections to meet current code, and those show up in the budget.
Permits and Code in Kamloops
Any addition needs a building permit from the City of Kamloops. The application will call for a site plan, structural drawings, and — for a second storey especially — engineered drawings stamped by a structural engineer, because you are changing how loads travel down through the building.
A few things Kamloops homeowners should plan for:
- Zoning compliance. Your lot has setback requirements, a maximum height, and a floor area or lot coverage limit under the City's zoning bylaw. A second storey has to stay under the height cap; a ground-floor addition has to respect side and rear setbacks. If your plans exceed what the zone allows, you may need a variance, which adds time.
- Structural assessment. For a second storey, expect the City and your engineer to require confirmation that the existing foundation and walls can carry the added load. Some homes need foundation underpinning or reinforced framing.
- BC Building Code and Step Code. New additions are built to the current BC Building Code. Depending on the scope, the addition portion may need to meet BC Energy Step Code requirements for insulation and air sealing — a good thing long-term, since a well-sealed addition is cheaper to heat and cool through Kamloops' cold winters and hot summers.
- Geotechnical considerations. On sloped or hillside lots, which are common around Kamloops, a geotechnical report is sometimes required before a permit is issued.
Permit timelines vary with the season and the complexity of the project, so build review time into your schedule rather than assuming you can break ground the week you apply.
Why Timing Your Start Matters
An addition opens up your home to the weather in a way most renovations do not. A second storey, in particular, means removing the existing roof and living with temporary protection until the new structure is framed, sheathed, and re-roofed. You do not want that stretch happening in December.
Late summer and early fall are a smart window to start in Kamloops. Beginning the enclosure work now means the structure can be framed and made weathertight before the first snow, with interior finishing carrying on through the colder months when the building is sealed. Starting a major addition in late fall risks weather delays right when your home is most exposed. If you are thinking about a 2026 or spring 2027 addition, the design and permit stage is worth beginning now so construction can start in the right season.
Living Through the Build
An addition is a bigger disruption than a contained basement or bathroom renovation. Depending on the scope, you may be able to stay in the home — walling off the work zone and maintaining a functioning kitchen and bathroom — or you may want to arrange to live elsewhere during the noisiest, most exposed phases, especially with a full second storey. A clear conversation with your contractor at the planning stage about staging, dust control, and which parts of the house stay usable will save a lot of stress once the work is underway.
Getting It Right the First Time
The homes that turn out best are the ones where the structural realities, the zoning limits, and the family's actual needs are all worked out on paper before the first wall comes down. That upfront planning is where an experienced local builder earns their keep — spotting the foundation that needs reinforcing, the setback that forces a design change, or the smarter layout that adds usable space without adding cost.
Hodder Construction has been building and expanding homes across Kamloops for more than 40 years, and we know how these projects behave in our climate, our terrain, and our permitting process. If you are weighing whether to build up or build out, [request a free estimate](https://www.hodder.ca/estimate) and we will help you understand what your home and your lot can support — and what it will realistically cost.