How Much Does a Garden Suite or Laneway Suite Cost in Toronto? (2026 Guide)

The most detailed public figures for Toronto garden suites come from the City's own monitoring work: building permits filed from 2022 to April 2025 declared an average estimated construction cost of about $260,000 and a median of $180,000. Where a project lands is decided by servicing distance, fire access, trees and finish level — the breakdown below walks through each.

Key takeaways

What the public data says

Toronto building permits filed from 2022 to April 2025 declared an average estimated construction cost of about $260,000 and a median of $180,000, according to the Garden Suites Zoning By-law Review and Monitoring Report prepared by Gladki Planning Associates for the City of Toronto (May 2025, Attachment 4 to PH23.1). Industry experts interviewed for that work put typical costs at $200–$300 per square foot (Attachment 5).

That is market data, not Modular X pricing, and permit estimates may be under-reported. Every figure, with its source and caveats: garden suite cost in Ontario.

Size and cost in the permit data

The same report puts the average garden suite on those permits at about 82 m² of gross floor area, with a median of 68 m². The City's consultants caution that permit estimates may not reflect actual construction budgets, and some permit records include work on the main house.

In the City's stakeholder interviews, two-storey garden suites cost more overall than single-storey designs, and challenging rear-yard access increases overall project expenses (Attachment 5). The Modular X approach is to establish a hard budget after a feasibility review and lock the module price before construction starts.

Toronto-specific cost items

• Development charges and parkland. Toronto's By-law 845-2025 says development charges are not imposed on a second, third or fourth residential unit, and its parkland dedication exemption covers one unit ancillary to the house, which includes laneway and garden suites, within the by-law's conditions.
• Building permit fee: $18.56 per m² of floor area, plus $56.33 per new residential unit (City rates effective 1 January 2026). For a 65 m² (~700 sq ft) suite, the area fee works out to about $1,206. Check the City's building permit fees page for the current schedule.
• Soft costs. Engineering, arborist reports, surveys, grading and drainage plans, utility connection permits. The total depends on the lot and project scope; a catalogue plan does not remove site-specific professional work.

Related: garden suites in Toronto, laneway suites in Toronto, garden suites in Etobicoke, and our Toronto laneway and garden suite permits guide (2026). Start with the lot check.

The fire access line item most owners miss

Toronto's fire-access rules trigger significant equipment costs based on the door-to-street distance:

• Suites where the door is less than 45 m from the street — no special fire-suppression equipment beyond code minimums.
• Suites where the door is between 45 m and 90 m from the street — residential sprinkler system, exterior strobe, and interconnected smoke/CO alarms are all required.
• Suites where the door is more than 90 m from the street — typically not permitted; feasibility check first.

This is the single most commonly missed line item in owner-run cost estimates. A quick measure from the front lot line to the proposed suite door tells you which bucket you fall into.

Made-in-Toronto pre-approved plans

Toronto's Made-in-Toronto program offers pre-approved studio and two-bedroom designs for both garden and laneway configurations. See the City's official pre-approved garden and laneway suite plans.

An unchanged catalogue design may reduce some design and review work, but savings and timing depend on the project. Toronto states that modifications, including HVAC or plumbing changes, remove pre-approved status. Factory adaptations therefore need designer and municipal review before relying on that status.

See our pre-approved plans catalogue for the studio, one-bed, and two-bed floor plans we deliver end-to-end.

What a builder's number may not include

Published figures and builder quotes rarely spell out what is included. Quotes commonly exclude:

• HST — quoted separately, and the rebate treatment depends on whether the suite is for rental or family use
• Landscaping, fencing, decking and hardscaping beyond what the permit requires
• Appliances and furnishings
• Upgrades above standard finishes — millwork, tile, fixtures and flooring move the number quickly
• Tree removal or arborist-required protection measures, which are lot-specific
• Hydro service upgrades where the existing panel cannot carry a second dwelling
• Survey and legal costs, including any title work a development charge deferral requires

Ask any builder which of these are inside their number before comparing two quotes. The gap between an inclusive and an exclusive quote is routinely larger than the gap between two builders.

Frequently asked questions

Working with a builder? See our laneway suite builder in Toronto and garden suite builder in Toronto pages, and start with the lot check.

Disclaimer: Figures cited are market estimates provided for information only and are not a quote. Municipal rules, fees, and programs change — always verify current requirements with your local authority. Modular X provides exact pricing only after a site-specific feasibility review.