A tandem garage layout parks two vehicles nose‑to‑tail in a single bay, trading extra depth for a narrower footprint. It suits narrow urban lots or homes where side‑yard setbacks limit width, and it can tuck alongside a house without dominating the façade. The biggest trade‑off is the “shuffle”: the inner vehicle is blocked by the outer one. If you only need weather cover for a second car, a simple carport garage may solve it without the depth.
Plan 36–40 ft of inside depth for two everyday vehicles plus walking space. Typical lengths: compact 14–15 ft, sedan 15–16 ft, SUV 17–19 ft, full‑size pickup 19–22 ft. Allow 24–26 ft for two compacts bumper‑to‑bumper, then add 3–4 ft total for safe passage between bumpers and at the door ends, and 2–3 ft for storage at the back wall if desired. Interior width of 12 ft is workable; 14–16 ft is comfortable for door swing and shelving (aim for 30–36 in clear beside the car). Door height of 7–8 ft is common; choose 8–9 ft if you run roof boxes or lifted SUVs. Many buyers add a rear overhead door to create a drive‑through and reduce shuffling. Depths like 40–48 ft also leave room for a bench or bikes behind the second car; see long layouts such as a 24×48 C-Channel Prefab Garage Kit when you need parking plus a small shop. Zoning on lot coverage, setbacks, and driveway length varies by municipality in Canada—confirm local rules before sizing.
Most tandems use a single front door (9–10 ft wide). Adding a second, aligned rear door creates a pass‑through to a lane or yard, easing winter snow build‑up and the blocking issue. A wider 10 ft door reduces mirror scrapes on narrow approaches. If you want side storage, keep at least 36 in clear beside a parked car. For smoother daily use, include a side man door near the inner stall. Structural bracing, fire separation to the house, and driveway slope/grade will be dictated by local code—your permit office or installer can advise. Ready to compare kits? For shopping, head to our 2 car garage kit category.
Building Kits From 30×30 Garages to 200×400 Hubs
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A tandem garage layout pushes cars two-deep instead of side-by-side, which concentrates loads along a long, narrow footprint and makes access planning critical. On narrow urban lots where side-yard setbacks limit width, this is often the only workable way to house two vehicles while keeping walking room and storage along one wall.
Most builds use a slab-on-grade with thickened edges (monolithic slab) or perimeter strip footings plus a slab. The long run means careful control-joint placement to limit cracking, and a slight floor slope to the door for drainage. Design frost protection to your local frost depth; provincial codes and municipal standards vary. Where grades change or soils are poor, a grade beam on piers may be recommended. Plan door thresholds (front, and optional rear pass-through) so the slab elevations align with driveway grades.
Depth for two vehicles plus comfortable circulation typically lands around 36–40 ft, depending on vehicle lengths, storage, and a workbench. Decide up front:
– Vehicle sizes and target interior clearances
– Door plan (single overhead at the street, plus an optional rear door to cut down shuffling)
– Wall height, roof pitch, and siding to match the house
– Windows, man-door placement, and electrical/heating rough-ins
– Driveway alignment and turning room on your lot
If you’re comparing packages, start at our detached garage kit category: detached garage kit. For broader planning and budget context, CMHC offers consumer guides worth checking: CMHC home buying resources.
Permit thresholds (size, height, setbacks, and lot coverage) are set by your municipality and can differ within a province. Most detached garages are “accessory buildings” requiring a permit, drawings, and inspections; some small structures are exempt, but the size limits vary by city or town. Start here for an overview and links to local rules: garage permit requirements in Canada.
Structural sizing follows the National Building Code of Canada, with provincial amendments and municipal climatic data. Long roofs need trusses or rafters sized for local ground snow load, plus attention to drifting where the garage sits near taller walls. Big door openings require adequate headers, hold-downs, and shear wall bracing for wind. In exposed coastal or prairie sites, uplift resistance at the roof-to-wall and wall-to-foundation connections is critical.
A single front overhead door is most common; adding a rear overhead door creates a drive-through and solves the daily shuffle. Include a side man-door near the street end for quick access and safety.
Underestimating depth and door strategy—ending up with two long vehicles and no clearance for shelving or safe walking, plus constant blocking. Measure your vehicles, add buffer space, and decide on a rear pass-through before you price.
Ready to price it right for your site? Enter your postal code to get matched with a vetted local builder and receive a local quote that reflects your soil, climate loads, and municipal rules.
A tandem garage layout is ideal for narrow lots, as it allows two vehicles to be parked in a single, deep bay without requiring a wide footprint. This can help to maximize space and maintain the aesthetic of your home’s façade, especially in urban areas with strict side-yard setbacks.
Yes, building a tandem garage typically requires a permit, as it is considered an accessory building. Permit requirements, including size, height, and setbacks, vary by municipality, so it’s important to consult your local authority to ensure compliance with local regulations.
The design of a tandem garage must adhere to the National Building Code of Canada, which includes considerations for snow and wind loads. Local climatic data and provincial amendments play a role, so it’s crucial to refer to your municipality’s guidelines or consult with an engineer to ensure proper structural support.
Most tandem garages use a slab-on-grade foundation with thickened edges or perimeter strip footings. The long layout necessitates careful placement of control joints to minimize cracking, and the floor should be slightly sloped towards the door for effective drainage. Local frost depth and soil conditions will influence the foundation design, so consult local standards.
