RS4 zoning in Delta: what can you build?
Single Detached Residential 4
On a standard lot with a rear lane, RS4 allows up to 4 units on a 33 × 122 ft lot (house with secondary suite and two detached units); up to 4 units on a 50 × 122 ft lot (house with secondary suite and two detached units); up to 4 units on a 66 × 122 ft lot (house with secondary suite and two detached units). 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 | Up to 4 units | House with secondary suite and two detached units (garden suite and coach house) | 2,352 sq ft |
| 50 × 122 ft6,100 sq ft | Up to 4 units | House with secondary suite and two detached units (garden suite and coach house) | 2,871 sq ft |
| 66 × 122 ft8,052 sq ft | Up to 4 units | House with secondary suite and two detached units (garden suite and coach house) | 3,358 sq ft |
Building options on a 33 × 122 ft lot
| Option | Status | Units | Max floor area |
|---|---|---|---|
| Single detached house | Allowed | 1 | 2,352 sq ft |
| House with secondary suite | Allowed | 2 | 2,352 sq ft |
| House with secondary suite and a garden suite or coach house | Allowed | 3 | 2,352 sq ft |
| House with secondary suite and two detached units (garden suite and coach house) | Allowed | 4 | 2,352 sq ft |
Size limits for house with secondary suite and two detached units on a 33 × 122 ft lot
| Max floor area (FSR 0.58) | 2,352 sq ft | DELTA RS4 s.11.40.4(a) |
|---|---|---|
| Max height | 31.2 ft, about 2.5 storeys | DELTA RS4 s.11.40.x |
| Site coverage | 45% of site | DELTA RS4 s.11.40.x |
| Front setback | 21.3 ft | DELTA RS4 s.11.40.x |
| Side setback | 4.9 ft | DELTA RS4 s.11.40.x |
| Rear setback | 29.5 ft | DELTA RS4 s.11.40.x |
| Rough building footprint | up to 1,647 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 RS4 zoning in Delta?
With a rear lane and outside a frequent-transit area, RS4 allows up to 4 units on a 33 × 122 ft lot (house with secondary suite and two detached units); up to 4 units on a 50 × 122 ft lot (house with secondary suite and two detached units); up to 4 units on a 66 × 122 ft lot (house with secondary suite and two detached units). 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 RS4 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
RS1RS2RS3RS4ARS5RS6RS7RD1RD3RD2RD4RSCRSFRH40RT40RT50RT62RT76TH-2RA20RA112RA120RA6RA180R