Staircase Placement for Second-Story Additions in New West

Staircase placement is one of the most critical design decisions when adding a second story to a small bungalow in New Westminster, because the staircase consumes 35 to 50 square feet of floor space on the first floor and its location affects the layout, flow, and functionality of both levels. In a compact bungalow where every square foot matters, getting the staircase position right — or wrong — shapes the entire project's success.

Contractors and designers working on second-story additions in New Westminster's older bungalow neighbourhoods — Queensborough, Queen's Park, Brow of the Hill, and Sapperton — typically evaluate three primary staircase placement strategies, each with distinct trade-offs.

Strategy 1: Centred within the existing floor plan. The most common approach places the staircase in the centre of the home, typically where a hallway or closet currently exists. This position minimizes the impact on perimeter rooms (bedrooms, living room, kitchen) because it uses interior space that is already transitional rather than functional. In a typical 900 to 1,100 square foot New Westminster bungalow, the hallway between bedrooms often provides a natural corridor for a straight-run or L-shaped staircase. The disadvantage is that a central staircase can split the first floor into two disconnected halves, disrupting the open-concept flow that many homeowners want. Contractors address this by widening doorways, removing non-load-bearing walls adjacent to the staircase, and using open-riser stair designs that allow sightlines through the stairs.

Strategy 2: Located over an existing closet, bathroom, or small room. Many designers look for a sacrificial space on the first floor — a closet, small bathroom, or utility room that can be repurposed as the staircase footprint. This approach preserves the primary living spaces intact. In New Westminster bungalows, the coat closet near the front entry or the linen closet in the hallway often occupies enough floor area for a compact staircase, especially if the opening can extend slightly into an adjacent room. If a first-floor bathroom is relocated or combined with another fixture, its footprint (typically 35 to 45 square feet) aligns well with staircase requirements. The trade-off is that you lose that first-floor amenity and must account for its replacement elsewhere in the plan.

Strategy 3: External stair tower or bump-out. When the existing floor plan is too small or too open to absorb an interior staircase without devastating the first-floor layout, contractors sometimes propose a small bump-out addition specifically to house the staircase. This adds approximately 40 to 60 square feet to the building footprint, keeping the existing first-floor rooms intact while providing a dedicated vertical circulation space. The bump-out approach works well on bungalows with side yards that have enough room to extend beyond the existing wall while maintaining the required side-yard setback. In New Westminster's RS zones, the minimum side-yard setback is typically 1.2 metres, and you need to verify that the bump-out does not push the building past the lot coverage maximum. The added cost for a stair bump-out — foundation, framing, roofing, and cladding for the small addition — is typically $15,000 to $30,000 on top of the staircase construction cost itself.

Regardless of placement strategy, the staircase must meet BC Building Code requirements for residential stairs. The minimum width is 860 mm (approximately 34 inches) clear between finished walls, the maximum riser height is 200 mm (7.9 inches), the minimum tread depth (run) is 255 mm (10 inches) including nosing, and the minimum headroom clearance is 1,950 mm (6 feet 5 inches) measured vertically from the nosing line. These dimensions are non-negotiable and directly determine the minimum floor area the staircase consumes. A straight-run staircase with a standard 8-foot floor-to-floor height requires approximately 10 to 12 feet of horizontal run plus a landing at the top and bottom — resulting in a footprint of roughly 35 to 45 square feet.

In practice, most small bungalows cannot accommodate a straight-run staircase without consuming too much linear floor space. Contractors more commonly use L-shaped stairs with a quarter-turn landing or U-shaped stairs with a half-turn landing to reduce the linear run. An L-shaped staircase fits into a roughly 7 by 7 foot footprint (49 square feet), while a U-shaped staircase fits into approximately 6 by 10 feet (60 square feet). The L-shape is the most popular choice for small bungalow additions because it balances compactness with comfortable proportions.

Winder stairs — where the landing is replaced by wedge-shaped treads that turn the corner — can reduce the footprint further, but they are less comfortable to walk on and can create accessibility issues. The BC Building Code permits winders in residential construction but imposes minimum tread depth requirements at the narrow end, which limits how tight the turn can be.

New Westminster's heritage and character home considerations add another layer. Many bungalows in neighbourhoods like Queen's Park are on the city's heritage register or fall within heritage conservation areas. If you are adding a second storey to a heritage-registered home, the staircase design and its impact on the home's original character become part of the heritage review process. The city may require that the exterior appearance of the staircase bump-out (if applicable) be compatible with the home's original architectural style.

The structural implications of staircase placement are significant. Cutting a staircase opening through the first-floor ceiling and second-floor subfloor requires removing or rerouting floor joists. If the staircase falls perpendicular to the joist direction, a large header beam must be installed to carry the interrupted joists around the opening. Your structural engineer designs these headers and the supporting posts or bearing walls below — this is not a detail that can be figured out on site. If the staircase can be aligned parallel to the joists, the structural modifications are simpler and less expensive.

Budget $8,000 to $25,000 for the staircase itself (structure, treads, risers, railings, and finishing) plus any structural modifications to accommodate the opening. Work with your designer to evaluate all three placement strategies against your specific floor plan before committing to a direction — changing the staircase location after framing has begun is extremely costly and disruptive.

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