On the right lot, a duplex is the best-kept secret in Vancouver housing math: roughly a third more construction cost, roughly two-thirds more completed value — and two families housed instead of one.
The core math
The duplex premium comes from what's shared: one lot, one excavation, one roof, one crane day. Two kitchens and two electrical services cost real money, but far less than a second lot would.
Strata-titling: the step that unlocks value
One permit stream, one construction contract, one schedule — a duplex is barely harder to build than a large single home.
A surveyor and lawyer divide the finished building into two titled homes — typically a low-five-figure cost.
Each half stands alone: sell one and keep one, house family in one, or hold both as rentals with separate titles.
Who a duplex suits
- Owner + mortgage helper: live in one half, and the other half's sale or rent carries most of the build cost.
- Two families building together: shared land cost, separate titles, a legal party-wall agreement — we structure these regularly.
- Downsizing owners: replace the old house with two smaller homes — keep one, fund retirement with the other.
We'll run the cost-and-value math for your address — free, before you spend anything on design.
✱ Representative planning figures for Metro Vancouver, mid-2026 — assembled from municipal permitting schedules, the BC Energy Step Code framework and Armacan project records. Every lot and scope is different: treat these as orientation, not a quote, and confirm against your property in a free consultation.
