What Port Moody homeowners should plan for before adding a water heater to a laneway house.
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Quick answer
A Port Moody laneway house at the rear of the lot needs its own gas water heater sized to a compact one- or two-bedroom footprint, with gas piped from the front meter across the yard. A tankless unit is a common choice here since it keeps the small mechanical space free for storage, but the deciding factor is usually the length and routing of the gas line run, not the appliance itself.
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Because a laneway house sits at the rear of the property, often near or over the garage, gas typically has to be run the full length of the yard from the front meter. That run needs to avoid existing landscaping, fences, and any other buried utilities, so it's worth having a licensed gas fitter walk the route before excavation starts.
Most laneway houses have a single bathroom and a modest kitchen, so fixture demand is on the lower end compared with a full house. A smaller tank or a compact tankless unit generally covers the load without needing the larger capacity sized for a full-size home.
| Unit Type | Fit for Laneway House | Note |
|---|---|---|
| Compact tank | Adequate for one-bath demand | Uses closet floor space |
| Tankless | Common choice | Wall-mounted, frees floor space |
| Larger tank | Usually unnecessary | Oversizing rarely helps in this footprint |
Laneway house mechanical closets are usually tucked beside the entry or under a stair, so a wall-mounted tankless unit keeps that space usable for storage. Vent termination has to clear the main house if it's close by, and clear any fence or property-line setback at the rear of the lot as well.
Laneway housing is a newer addition to Port Moody's housing options, generally built on established single-family lots in the city's older neighbourhoods rather than the newer hillside subdivisions. The gas line run and unit sizing are reviewed through the City of Port Moody's laneway or secondary dwelling permit process alongside the rest of the build.
Water supply for a laneway house is the same soft, low-scale reservoir water used across the region, so no special water-quality allowance is needed when choosing between tank and tankless.
Given the modest fixture load and relatively simple mechanical setup, a laneway house water heater that's failed is usually straightforward to replace like-for-like using the existing gas line and vent location, which keeps the job efficient without disturbing the rest of the small dwelling.
Some Port Moody laneway houses are designed with a future second bathroom in mind, even if only one is finished initially. If that's the plan, it's worth sizing the water heater and the gas line for the eventual fixture count now, since retrofitting a larger line later means digging up a yard that's already landscaped around the laneway house.
A quick conversation with your gas fitter about future plans for the space, before the trench is closed, is a small step that avoids a much larger job down the road.
Safety note
If you ever smell gas, hear hissing near a gas line, or suspect a venting or carbon-monoxide problem, leave the home right away and call FortisBC at 1-800-663-9911 from somewhere safe before doing anything else. All gas piping, venting, and combustion-safety work must be carried out by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870 and boiler licence LBP0046450.
It's typically run from the front gas meter across the yard to the laneway house, a route a licensed gas fitter should walk in advance to avoid landscaping and buried utilities.
Usually, yes -- most laneway houses have one bathroom and a modest kitchen, so a compact tank or tankless unit covers typical demand.
Yes, it's reviewed through the City of Port Moody's laneway or secondary dwelling permit process along with the rest of the build.
No -- the laneway house is sized on its own fixture count, independent of what's installed in the main house.
As a ballpark, not a quote, a tankless install runs $3,500 to $7,500, with the gas line run sometimes adding to the total depending on distance from the meter.
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