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
5,500 sf
3
950 sf
$310
16%
$75
3
$28,000
$2,400/mo
5.5%
$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.
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.
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.