Cambridge · Home Additions
Home Additions in Cambridge
Cambridge’s Comprehensive Zoning By-law 26-007 changed residential setbacks, height and coverage limits across much of the city in February 2026. A home addition designed to the old By-law 150-85 numbers may no longer fit. Before any sketch, we check your lot’s current zone, then the GRCA and heritage maps.
Additions in Cambridge
What’s different in Cambridge
| Permit office | City of Cambridge Building Services Division (official site, opens in a new tab) |
|---|---|
| Zoning | By-law 26-007 since 3 February 2026. Design to the current zone, not a neighbour’s older addition. |
| Minor variance | Committee of Adjustment hearing with neighbour notice. Two to three months to a final decision. |
| Conservation authority | GRCA permit in floodplain or valley areas along the Speed through Hespeler and Preston, and along the Grand. |
| Floodplain additions | May be limited in size or need the new floor raised above the regulatory flood level. |
| Heritage | Exterior changes in Main Street Galt or the proposed Galt Core district go to heritage staff. |
| Typical stock | 1950s–60s Preston bungalows on block foundations. East Galt stone and brick houses with old rear lean-tos. |
Worth knowing first
Joining a new addition to a Galt stone house
Adding onto a stone house in Galt is its own craft. The new wall meets Galt's thick rubble masonry, which moves differently from a wood frame. We set a Galt addition on its own footings below frost and frame it independently. A flashed movement joint connects it to the stone, so the two can settle at different rates without cracking. Any opening between old and new gets an engineered lintel sized for the masonry above, with lime-mortar repair instead of Portland cement. This junction work adds about $8,000–$20,000 before HST over a frame-house addition. In East Galt, it often replaces an old rear lean-to.
The scope, pricing tiers and 5-step process are the same everywhere we work. See Home Additions ›
Frequently asked questions
Additions in Cambridge: three local questions
Sometimes, after an engineer checks it. Many Preston bungalows from the 1950s and 60s sit on block foundations with footings sized for one floor. On those Preston block foundations the engineer reviews footing size, wall condition and soil, and may specify underpinning or new interior footings. The second storey must also fit your zone’s height limit under By-law 26-007. If the footings need major work, a rear addition can be better value.
About two to three months from a complete application to a final decision, including the appeal period. The Committee holds a public hearing, notifies nearby owners and weighs whether the request is minor and fits the Official Plan and zoning by-law. The building permit can’t issue until the decision is final.
If the lot is in the Grand River Conservation Authority’s regulated area, yes. Much of the land along the Speed River through Hespeler and Preston is floodplain or valley slope. New floor area there is reviewed for flood and erosion risk. A floodplain addition may be limited in size or need its floor raised above the regulatory flood level. The GRCA permit comes before the City permit.
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