Our Sandy Hill duplex has a shared chimney between units — who pays for the tuckpointing repairs?

The responsibility for shared chimney repairs in a duplex depends on your property deed, condominium declaration (if applicable), and local bylaws — but the short answer is that you'll likely need to split the cost with your neighbour, and the specific terms should be clearly outlined in your property documents.

In most duplex situations, a shared chimney is considered a "common element" that both units depend on, similar to a shared roof or foundation wall. This typically means both owners are jointly responsible for maintaining it and splitting the cost of necessary repairs. However, some deeds specify that one unit owns the chimney exclusively while the other has an easement or right to use it — in those cases, the owning unit bears full responsibility. The only way to know for certain is to review your deed, property survey, or any condo documents if your duplex is registered as a condominium.

The practical approach is to have a WETT-certified chimney inspector examine the chimney and provide a detailed report on the extent of tuckpointing needed. Tuckpointing costs in Ottawa typically run $500 to $2,500 depending on the height of the chimney, the number of mortar joints that need repointing, and whether the work includes chimney crown or cap repair. Once you have a clear scope of work and price, contact your neighbour with a copy of the inspection report and discuss cost-sharing. In Sandy Hill, many duplexes built in the early 20th century have masonry chimneys that are particularly vulnerable to Ottawa's freeze-thaw cycle, so this is a conversation worth having sooner rather than later — a small tuckpointing job today prevents a catastrophic chimney rebuild in five years.

If your neighbour refuses to cooperate or disputes the cost-sharing arrangement, you may need to consult your property deed or contact a real estate lawyer to clarify the legal responsibility. Some municipalities also have bylaws requiring property owners to maintain chimneys to prevent hazards — the City of Ottawa could potentially require repairs regardless of who pays.

One critical point: before scheduling any tuckpointing work, ensure the contractor is also inspecting the chimney crown (the concrete or mortar cap at the top). The crown is often the root cause of moisture infiltration that damages mortar joints. Repointing the sides of the chimney without fixing a cracked crown is like painting over mold — you are addressing the symptom, not the disease. A complete assessment costs $250 to $450 for a Level 1 WETT inspection and will clarify exactly what needs to be done.

You can browse fireplace and chimney contractors through the Ottawa Construction Network directory to find WETT-certified inspectors and masons experienced with shared chimney situations in Sandy Hill heritage properties.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

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