Can I model a house plus two suites?

Yes in spirit — set three units and adjust GFA per unit to match your program. The calculator does not enforce local suite definitions.

Does this read my zoning?

No. This is an assumption calculator — you set lot size, costs, and rents. For parcel-backed zoning facts, use Bucky’s free address tools or a project workspace.

Developers, architects, and planning consultants who want a fast “does this typology pencil?” check before committing to a site or detailed study.

Free interactive pencil test

Will my triplex pencil?

Three units on one lot. Tune parking, hard costs, and rents to see the go / marginal / no line.

Triplex pencil test

Illustrative assumptions only — does not read your zoning or parcel record.

Doesn't pencilRental · 3 units

$2,817/mo required

Market rent $2,400/mo · 3 units

All-in $1,521,360 · $507,120/unit

Lot area (sf)5,500 sf

Storeys3

GFA per unit (sf)950 sf

Hard cost ($/sf)$310

Soft costs (% of hard)16%

Land cost ($/sf)$75

Parking stalls3

Parking cost / stall$28,000

Market rent / unit / mo$2,400/mo

Target yield5.5%

OpEx / unit / mo$380/mo

Cost build-up

Hard construction$883,500
Soft costs$141,360
Parking$84,000
Land$412,500
All-in$1,521,360

Save this scenario

Email yourself the verdict, cost build-up, and a link you can reopen — no account required.

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Why we built this

Triplex rules are expanding in many cities. This tool answers the money question before you buy or design.

When a scenario looks promising, take the next step on a real address — zoning, lot dimensions, setbacks, and height limits are free tools on Bucky.

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More typology pencil tests

FAQ

Can I model a house plus two suites?: Yes in spirit — set three units and adjust GFA per unit to match your program. The calculator does not enforce local suite definitions.
Does this read my zoning?: No. This is an assumption calculator — you set lot size, costs, and rents. For parcel-backed zoning facts, use Bucky’s free address tools or a project workspace.
Who is this for?: Developers, architects, and planning consultants who want a fast “does this typology pencil?” check before committing to a site or detailed study.