What Is an Infill Lot in Ottawa and Can You Build on It?

You've spotted a vacant lot in an established Ottawa neighbourhood, or you're sitting on a large property that might be worth severing. Before you get too far ahead, you need to understand what Ottawa considers "infill" development and what the rules say about building on these lots.

What Is an Infill Lot?

An infill lot is a vacant or underutilized parcel of land located within an already-developed area, as opposed to a greenfield lot on the city's suburban fringe. Infill lots are typically created in one of two ways:

• Lot severance (consent) – A large lot is split into two or more smaller lots, creating a new buildable parcel beside the original home
• Demolition infill – An older structure is torn down and replaced with a new building (or multiple buildings) on the same lot

In Ottawa, infill development is explicitly encouraged by the 2020 Official Plan, which prioritizes intensification in established neighbourhoods over sprawl into undeveloped land.

Can You Build on an Infill Lot in Ottawa?

Generally yes, but whether a specific infill lot is buildable depends on several factors.

Zoning

Your infill lot must be zoned for the type of building you want to construct. Under Ottawa's new Zoning By-law, most infill in established residential areas falls under the N1, N2, N3, or N4 zone. If your lot was formerly zoned R1, R2, or R3, it now falls under the equivalent N zone, which is generally more permissive.

Minimum Lot Size

Ottawa's Zoning By-law sets minimum lot widths and areas for each zone and housing type. An infill lot created through severance must meet these minimums, or require a minor variance from the Committee of Adjustment. See: Ottawa Minimum Lot Size Requirements by Zone.

Neighbourhood Compatibility

Ottawa has rules to ensure new infill housing is compatible with its surroundings. These govern building height, front-yard setbacks, and lot coverage. See: How Close Can You Build? Ottawa Property Line Setbacks.

Lot Severance Approval

If you're creating the infill lot through severance, you need consent approval from the City of Ottawa's Committee of Adjustment. The Committee considers the size, shape, and configuration of both the new lot and the retained lot, as well as the Official Plan policies for the area.

What Can You Build on an Ottawa Infill Lot?

What you can build depends on your zone, but Ottawa's new Zoning By-law is considerably more permissive for infill than the old R-zone system was. Common infill project types include:

• Single detached homes – Permitted in all N zones
• Duplexes and semis – Common in N1 and N2 zones
• Triplexes and fourplexes – Possible in many N2, N3, and N4 zones, often as-of-right under the new by-law
• Townhouses – Typically permitted in N3 and N4 zones
• Low-rise apartments – N4 zones permit small apartment buildings

Common Challenges with Ottawa Infill Development

• Tight lots – Often narrower than minimums, requiring variances. See: How to Apply for a Zoning Variance in Ottawa
• Grade changes – Established neighbourhoods often have uneven grades that affect foundation design and drainage
• Tree protection – Ottawa's tree protection rules may restrict grading and excavation near significant trees. See: Ottawa Green Space and Tree Protection Rules for Builders
• Servicing – Confirming water, sewer, and electrical capacity exists for the new build
• Neighbour objections – Infill projects often attract comments from adjacent property owners during the approval process

Frequently Asked Questions

What is considered an infill lot in Ottawa?

An infill lot is a vacant or underused parcel within an established neighbourhood, typically created through a lot severance or by demolishing an existing structure. Ottawa's Official Plan encourages infill as a way to add housing in built-up areas without expanding the urban boundary.

Do I need a variance to build on an infill lot in Ottawa?

Not always. If your lot meets the minimum size and setback requirements for its zone, you can build as-of-right. But many infill lots, particularly those created through severance, are narrower than the standard minimum, requiring a minor variance.

How do I sever a lot in Ottawa?

Lot severance requires a consent application to the City of Ottawa's Committee of Adjustment. If approved, conditions typically include submitting final survey plans and paying development charges.

Can I build a multiplex on an infill lot in Ottawa?

Possibly. Under Ottawa's new Zoning By-law, many infill lots in N1, N2, and N3 zones can accommodate two, three, or four units as-of-right, provided the lot meets minimum size requirements and setback rules.

How long does infill development approval take in Ottawa?

A straightforward infill build on a properly zoned lot primarily requires a building permit, typically 4–8 weeks for residential projects. If a severance or variance is required, add several months for the Committee of Adjustment process.