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Custom Home Builder in Mississauga
If you are talking to a custom home builder in Mississauga who still describes your property as R3 or R7, they are reading a by-law that no longer exists. In 2025 the City folded its old detached and semi-detached zones into two new ones, RL and RS, and on many lots that changed what can be built. We start every project there, with the zone, the lot and the numbers attached to both, before anyone spends money on drawings.
Select Design Build is a design-build custom home builder working across Mississauga, from Port Credit and Lorne Park through Mineola, Clarkson, Streetsville and Erin Mills. The same people who read your zoning carry the file through permit and onto the site, which is where most of the delays on a custom home start.
We check your zone, trees and grading, and tell you what the lot allows. No drawings required.
Licensed to Build in Ontario
Anyone who builds a new home in Ontario needs a licence from the Home Construction Regulatory Authority, and starting construction without one is a provincial offence. When the house goes up on land you already own, the builder needs both a builder and a vendor licence, and the home has to be enrolled with Tarion before work begins. You can check any builder yourself in the public Ontario Builder Directory.
What this gives you
A contract home carries a seven year warranty on construction defects, covering up to $400,000 from the date you take possession. If the contract ends before the house is finished, contract homes are also covered for financial loss. None of that applies if the builder is unlicensed or the home was never enrolled.
One exception worth knowing
If you build a home for yourself, on land you own, and manage the construction yourself, you are an owner-builder and no HCRA licence is required. The trade-off is that owner-built homes are not enrolled with Tarion, so the warranty above does not exist. Homeowners are sometimes steered toward this arrangement by builders who cannot get licensed. Ask the question directly before you sign anything.
What Your Mississauga Lot Allows Under the New RL and RS Zones
By-law 0048-2025 collapsed twelve detached dwelling zones and two semi-detached zones into two: RL for Residential Large Lot and RS for Residential Small Lot. The old R and RM sections are marked deleted in the consolidated zoning text. Your zone letter changed, and on many lots so did the envelope you can build inside.
The current numbers for detached houses in both zones:
| Regulation | RL | RS |
|---|---|---|
| Minimum lot area, interior lot | 550 m² | 285 m² |
| Minimum lot frontage, interior lot | 15.0 m | 9.75 m |
| Maximum lot coverage | 35% | 40% |
| Minimum front yard | 7.5 m | 3.5 m |
| Minimum rear yard, interior lot | 7.5 m | 7.0 m |
| Maximum height, sloped roof | 10.7 m | 10.7 m |
| Maximum height, flat roof | 7.5 m | 7.5 m |
| Maximum dwelling depth | 20.0 m | 20.0 m |
| Landscaped soft area, yard with the driveway | 40% of the front yard | 30% of the front yard |
The number that decides your house size
Lots inside an RL infill exception zone carry a separate cap on gross floor area, set at 190 square metres plus 0.20 times the lot area.
On a 700 square metre lot
roughly 3,550 sq ft
before counting anything the by-law excludes
Run that calculation on your own lot before you fall for a floor plan. The same infill rules limit the garage to 2.5 metres in front of the first storey wall, and side yard minimums change at the 18 metre frontage mark.
The 20 metre depth limit catches people on deep, narrow lots in the older neighbourhoods. So does the soft landscaping rule, which quietly caps how wide the driveway can get.
The Approval Path for Mississauga Custom Home Construction
Mississauga custom home construction runs through the City, the Region of Peel, and in many parts of town a conservation authority. Custom home builders in Mississauga who chase these in the wrong order lose weeks to it. Which conservation authority applies depends on your watershed, not the city boundary.
Zoning check: Confirm the current RL or RS designation and any exception zone attached to it.
Demolition permit: Taking down the existing house is a separate permit.
Tree permit and arborist report: The City requires an arborist report for all development and construction projects, so this starts earlier than most people expect.
Conservation authority approval: Mississauga sits across three of them: Toronto and Region Conservation Authority, Credit Valley Conservation and Conservation Halton. The City lists all three in its own variance application package. Properties near the Credit River, Etobicoke Creek or the lakefront are the usual triggers.
Heritage permit, where it applies: Properties inside the Old Port Credit Village or Meadowvale Village heritage conservation districts need heritage approval before exterior work.
Electronic pre-screening: A non-refundable fee paid before the application enters review.
Building permit through ePlans: The main permit, calculated on floor area.
Region of Peel: Water and sanitary servicing and the regional share of development charges are handled by the Region, not the City.
Inspections: Booked in sequence as the build progresses.
If the design does not fit inside the zone limits above, a Committee of Adjustment application is added before the building permit, and it is the step that moves the timeline most.
Permit Fees and Development Charges in Mississauga
Two separate costs get confused constantly. The permit fee pays for the City’s review and inspections. Development charges pay for infrastructure, and on a new house on vacant land they are the larger number by a wide margin.
Building permit fees, effective February 1, 2026 through January 31, 2027:
| Item | 2026 fee |
|---|---|
| Detached, semi-detached, townhouse, duplex | $18.99 per m² |
| Minimum fee, any Part 9 residential project | $244 |
| Electronic pre-screening | $50, non-refundable |
| Demolition of a house | $22.66 per 100 m² demolished |
Decks, fireplaces, unfinished basements and an attached garage carry no extra permit fee when they are built at the same time as the house. The full schedule is on the City’s building permit fee schedule page.
- One house for one house
Tearing down and rebuilding one house
This is where most custom home budgets get development charges wrong. The City’s development charges by-law gives a demolition credit equal to the charge for the same number of dwelling units. Two conditions apply: the new house goes on the same parcel, and its permit is ready to issue within five years of the demolition permit. Replace one house with one house inside that window, and the credit offsets the City charge for that unit. The Region of Peel and the school boards set their own charges, so confirm those separately. The City’s page on development charge credits and exemptions is the place to start.
- Deadline, November 13, 2026
Building on a vacant or severed lot
City reduction on residential development charges
Region of Peel grant in lieu of the regional charge
This is where development charges land in full, and where the current reductions matter. The City has reduced residential development charges by 50 percent, and the Region of Peel offers a grant in lieu equal to 50 percent of the regional charge. Both depend on a building permit for footings and foundations being pulled before November 13, 2026. These programs were written with residential development in mind, so whether a single custom home qualifies has to be confirmed with the City for your specific property. We get that answer in writing before you budget around it.
Published development charge figures vary widely depending on unit type and which charges are counted, so work from the City’s current rate schedule rather than a number quoted in an article.
When Custom Homes in Mississauga Need a Minor Variance
Custom homes in Mississauga end up at the Committee of Adjustment for predictable reasons: gross floor area in an infill zone, overall height, a side yard on a narrow lot, or a garage that sits too far forward. The application asks the Committee to relax one regulation for your property without rezoning it.
Mississauga, 2026, R, RS, RL or RM zone, exempt from HST
the same application in Oakville
The 2026 fee for a minor variance in an R, RS, RL or RM zone is $1,361 per application, exempt from HST. The same application costs $4,303 in Oakville. The Committee applies four tests, and all four have to pass:
The City recommends a zoning review first, and talking the proposal through with staff and with your neighbours before you file. That advice is worth taking. Applications that arrive after a staff conversation come back cleaner, and neighbours who hear about a project from the owner, not from a notice in the mail, are less likely to show up opposed.
Where the numbers allow it, design inside the by-law. A redesign usually costs less than a hearing plus the months it adds.
Trees, Heritage Districts and the Credit River
None of these three appear in the zoning table, and each one can move the footprint of the house. Of the three, trees come up on the most Mississauga lots.
Trees
Mississauga, dead and dying trees included
Toronto’s threshold, for comparison
Mississauga protects every tree on private property measuring 15 centimetres or more in diameter, including dead and dying trees. Toronto’s threshold is 30 centimetres, so a lot that would be clear under Toronto’s rule can carry several protected trees here. A dead tree still needs a permit, though it carries no fee and no arborist report.
For a custom home, four rules shape the site plan:
- The arborist report comes first: the City requires one for all development and construction projects, and it belongs in hand before the permit application.
- Replacement planting scales with size: one replacement tree for every 15 centimetres of diameter removed, so a 45 centimetre tree means three replacements. Japanese maples, cedars and junipers do not count.
- Review takes time: the City allows itself 30 business days to review a complete tree permit application.
- The deposit comes back a year later: if the replacement tree is healthy twelve months after planting, the deposit is refunded once the City inspects it.
A protected tree limits more than removal. Its root zone controls where the excavator can dig, where the bin sits and where materials are stored, so we plot every tree on the survey before the footprint is fixed.
Heritage districts
Mississauga has two heritage conservation districts: Old Port Credit Village and Meadowvale Village. Proposals in either one are reviewed first by a local advisory subcommittee and then by the City’s Heritage Advisory Committee, and the City publishes submission deadlines tied to each meeting. A heritage impact assessment, where one is required, has to follow the City’s terms of reference. Build this into the schedule from the start. Missing a deadline by a week can cost a month.
The Credit River and conservation review
Properties along the Credit River valley, Etobicoke Creek and the lakefront usually need conservation authority approval before a permit can be issued. Grading and drainage get closer review on these lots, and the engineering work that goes with it belongs in the budget from the first estimate.
Two Paths to a Building Permit in Mississauga
Every Mississauga custom home follows one of two routes, and the zoning table decides which.
Inside the zone limits
The sequence is drawings, tree permit and arborist report, conservation or heritage approval where the property needs it, permit submission through ePlans, review and revisions, then construction.
- Drawings
- Tree permit and arborist report
- Conservation or heritage approval, where needed
- Permit submission through ePlans
- Review and revisions
- Construction
Outside the zone limits
A Committee of Adjustment application is added ahead of the building permit, along with the circulation, hearing and decision that come with it.
- Committee of Adjustment application
- Circulation
- Hearing
- Decision
- Then the building permit path
That question gets answered on the first site visit, not after the drawings. Finding a problem on paper means moving a wall; finding it at the Committee means waiting for the next hearing.
Any review time quoted online is a snapshot. A complete submission moves faster than an incomplete one, and the City can give you its current turnaround directly.
Building Across Mississauga’s Neighbourhoods
Two lots a few kilometres apart can face completely different approval paths. The pattern by area:
Port Credit
The Old Port Credit Village heritage district covers the area between Lakeshore Road West, Mississauga Road South, the Credit River and the lake. Lakefront lots add conservation review.
Meadowvale Village
A heritage conservation district along Second Line West and Old Derry Road, bounded to the west by the Credit River.
Lorne Park and Mineola
Older, larger lots where mature trees are common and the tree plan often shapes the footprint.
Clarkson
Established streets with mature canopy; tree permits and arborist reports are routine here.
Streetsville
Lots close to the Credit River valley can trigger conservation authority review.
Erin Mills and Churchill Meadows
Newer subdivisions where tree and heritage issues are less common, and lot size drives the zoning questions instead.
We also build in Cooksville, Erindale, Sheridan, Applewood, Lakeview, Meadowvale and Malton.
Frequently Asked Questions
What zone is my Mississauga property in now?
By-law 0048-2025 replaced the old detached and semi-detached zones with two: RL (Residential Large Lot) and RS (Residential Small Lot). If your property was R3, R7 or similar, it now sits in RL or RS, often with an exception zone attached. Send us the address and we confirm the current designation against the consolidated zoning text before anything is drawn.
How large a house can I build on an infill lot?
Lots inside an RL infill exception zone carry a cap on gross floor area of 190 square metres plus 0.20 times the lot area. On a 700 square metre lot that is roughly 330 square metres, about 3,550 square feet, before anything the by-law excludes. Lot coverage, the 20 metre depth limit and the 10.7 metre height limit apply on top of it.
Do I need a permit to remove a dead tree?
Yes. Mississauga protects every tree on private property measuring 15 centimetres or more in diameter, and dead and dying trees are included. A dead tree still needs a permit, though it carries no fee and no arborist report. The City allows itself 30 business days to review a complete tree permit application.
Will I pay development charges on a teardown and rebuild?
The City’s development charges by-law gives a demolition credit equal to the charge for the same number of dwelling units, provided the new house goes on the same parcel and its permit is ready to issue within five years of the demolition permit. Replace one house with one house inside that window and the credit offsets the City charge for that unit. The Region of Peel and the school boards set their own charges, so confirm those separately.
How much does a minor variance cost in Mississauga?
The 2026 fee for a minor variance in an R, RS, RL or RM zone is $1,361 per application, exempt from HST. The same application costs $4,303 in Oakville. That is the application fee only; drawings, notices and the time the hearing adds to the schedule sit on top of it.
Which conservation authority will review my lot?
It depends on your watershed, not the city boundary. Mississauga sits across three: Toronto and Region Conservation Authority, Credit Valley Conservation and Conservation Halton. Properties near the Credit River, Etobicoke Creek or the lakefront are the usual triggers, and we confirm which one applies at the first site visit.
Send us the address. We check the zone, the trees and the grading, and tell you what the lot can carry before anything is drawn.
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