Home Additions in Mississauga
From second storeys on 1950s bungalows in Applewood and Clarkson to large rear additions in Lorne Park and Mineola, we design and build Mississauga home additions and manage every City of Mississauga approval.
Why Mississauga Additions Need a Different Approach
Much of south Mississauga was built in the decade after the war. Applewood began in 1955, Clarkson's Park Royal opened in 1958, and Lorne Park and Mineola grew on large, wooded lots once the QEW arrived. Those bungalows and side-splits on wide lots are some of the best candidates in the GTA for an addition: a second storey, a rear family room and kitchen, or both.
The zoning is what decides how big. Mississauga's RL zone allows 35% lot coverage, a 10.7 m height with a sloped roof and a dwelling depth of up to 20 m, but many established neighbourhoods carry infill exception zones that cap gross floor area at 190 m² plus 20% of the lot area and require wider combined side yards on lots 18 m or wider. We check your lot's exact zone before design starts, because it sets the size of the addition.
The process is simpler than it used to be. Mississauga no longer requires site plan approval for houses, so most additions go straight to a building permit, with a minor variance only if the design breaks a zoning rule. Lots near the Credit River, the creek valleys or the lakeshore may also need a conservation authority permit. We manage Mississauga projects from our Oakville office.
- Licensed & insured contractors
- Transparent, itemized pricing
- Permits & approvals handled for you
- On-time delivery, every project
Home Additions We Build in Mississauga
Every kind of Mississauga addition and extension, from a few extra feet to a whole new floor.
Second-Storey Additions
A full new floor on an Applewood, Clarkson or Lakeview bungalow, with structural review of the existing house.
Rear Extensions
New family rooms and larger kitchens across the back of the house, opening the main floor to the yard.
Large-Lot Additions
Bigger additions on Lorne Park and Mineola lots, designed within the infill floor area limits.
Side-Split Additions
Adding a level or extending the upper floor of the split-level homes common across south Mississauga.
In-Law Additions
Main-floor bedroom suites and accessible spaces for parents moving in.
Bump-Outs
A few extra feet for a kitchen, primary bedroom or mudroom, with the same zoning check and permit.
What Makes an Addition in Mississauga Different
These are the things that actually decide what you can build in Mississauga, how long approvals take and what it costs.
Infill Floor Area Caps
Infill exception zones cap gross floor area at 190 m² plus 20% of the lot area. We design to the limit, not past it.
No Site Plan for Houses
Mississauga exempts residential development of 10 units or fewer from site plan control, which shortens the path for additions.
Minor Variance Fee
If the design needs a variance, Mississauga's 2026 fee for a residential application is $1,361.
Permit Fees
The 2026 building permit fee for a residential addition is $13.96 per square metre, so a 40 m² addition is about $560.
Heritage Districts
Meadowvale Village, Old Port Credit Village and Streetsville are heritage conservation districts with their own approval step.
Valleys and the Lakeshore
Credit Valley Conservation regulates most of the city's valleys. Lots near them do not get the provincial 90% setback relief.
What a Home Addition Costs in Mississauga
Across the GTA, a small bump-out typically costs $30,000 to $70,000, a single-storey rear or side addition $80,000 to $200,000, and a second-storey addition $150,000 to $400,000 or more. Per square foot, most single-storey additions land between $300 and $500, and second storeys between $350 and $550, because the existing structure has to carry the new floor and a staircase is added.
In Mississauga, lot size and zoning shape the project as much as finishes. A second storey on an Applewood bungalow and a large rear addition in Lorne Park can cost similar amounts but deliver very different space, so we price options side by side. Budget separately for the survey, drawings, engineering, any variance and a 10 to 15% contingency in an older house.
Mississauga Neighbourhoods We Serve
We build additions right across Mississauga, from the lakeshore to the north end of the city.
Our Simple 5-Step Process
From the first site visit to the final inspection, we make adding space to your Mississauga home clear and stress-free.
Reach Out
Call us or fill out our quick form to tell us how much space you need.
Free Consultation
We visit your home, review your lot and zoning, and talk through design, budget and approvals.
Detailed Estimate
You receive a transparent, itemized estimate within 2 to 3 business days.
Review & Refine
We walk through the proposal together until you are fully confident.
Sign & Start
We lock in your start date and handle scheduling, permits and coordination.
Recent Additions and New Living Space
A look at additions, extensions and new living space we have built across Toronto and the GTA.
Mississauga Home Addition FAQs
How much does a home addition cost in Mississauga?
How long does a home addition take in Mississauga?
How big can my addition be in Mississauga?
Do I need site plan approval for an addition in Mississauga?
How much is a minor variance in Mississauga?
Which office serves Mississauga?
Ready to Add Space to Your Mississauga Home?
Book a free consultation. We will check what your lot allows, tell you which approvals your design needs and give you an itemized estimate.
Serving Mississauga from our Oakville office — 1040 Speere Rd, Oakville, ON L6L 2X4 · All Mississauga renovation services