RD4 zoning in Delta: what can you build?
Infill Duplex Residential
On a standard lot with a rear lane, RD4 allows up to 4 units on a 66 × 122 ft lot (duplex with two secondary suites). These figures come from running BuildHere’s engine on each lot size with the Delta rules for this zone.
Most units by lot size
| Lot (with lane) | Most units | Building form | Max floor area |
|---|---|---|---|
| 33 × 122 ft4,026 sq ft | None outright | – | – |
| 50 × 122 ft6,100 sq ft | None outright | – | – |
| 66 × 122 ft8,052 sq ft | Up to 4 units | Duplex with two secondary suites | 3,416 sq ft |
Building options on a 66 × 122 ft lot
| Option | Status | Units | Max floor area |
|---|---|---|---|
| Duplex | Allowed | 2 | 3,416 sq ft |
| Duplex with two secondary suites | Allowed | 4 | 3,416 sq ft |
Size limits for duplex with two secondary suites on a 66 × 122 ft lot
| Max floor area (FSR 0.42) | 3,416 sq ft | DELTA RD4 s.12.40.4(a)(i) |
|---|---|---|
| Max height | 31.2 ft, about 2.5 storeys | DELTA RD4 s.12.40.x |
| Site coverage | 45% of site | DELTA RD4 s.12.40.x |
| Front setback | 21.3 ft | DELTA RD4 s.12.40.x |
| Side setback | 4.9 ft | DELTA RD4 s.12.40.x |
| Rear setback | 24.6 ft | DELTA RD4 s.12.40.x |
| Rough building footprint | up to 3,627 sq ft | Estimate, not a design |
| Parking stalls required | 4 stalls (minimum) | DELTA s.8.4.2 |
Your lot will differ.
Frontage, depth, lane access, corner lots and frequent-transit areas all change the answer. Search your address for a report on the real lot in Delta.
Common questions
How many units can I build in RD4 zoning in Delta?
With a rear lane and outside a frequent-transit area, RD4 allows up to 4 units on a 66 × 122 ft lot (duplex with two secondary suites). Smaller lots fall short of the zone's minimums. Your own lot's frontage, depth and location change the result.
What is FSR?
Floor space ratio (FSR) is a building’s total floor area divided by the lot area. An FSR of 1.0 on a 4,026 sq ft lot allows about 4,026 sq ft of floor area across all storeys. Some bylaws, such as Burnaby’s R1, set no FSR at all; there BuildHere shows an effective FSR worked out from the height, setback and lot coverage limits.
Where do these RD4 rules come from?
From Delta Zoning Bylaw No. 7600, 2017, consolidated for reference purposes (April 21, 2026, through Bylaw 8552): s.6.1.2(g)-(h) dwelling units per lot, s.6.1.8 accessory dwelling units, s.8.2 and 8.4.2 parking, Part 11 (RS zones) and Part 12 (RD zones), Consolidated for reference purposes only, April 21, 2026 consolidation (rules approved 2026-10-20). Preliminary screening only. Verify with the Corporation of Delta.
Other Delta zones
RS1RS2RS3RS4RS4ARS5RS6RS7RD1RD3RD2RSCRSFRH40RT40RT50RT62RT76TH-2RA20RA112RA120RA6RA180R