Demolish or renovate, how to decide
It is the most expensive call in a property project, and it is often made on instinct rather than figures. Here are the criteria contractors look at first, and the signals that you are about to put money into a building that will not return it.
First criterion, the condition of the structure
Everything starts there. A deeply cracked foundation, a sagging frame or joists attacked by water over a large area completely change the equation. Rebuilding a structure is expensive and the result is still an old structure.
Conversely, a sound structure in a badly laid out building is an excellent candidate for heavy renovation. You keep what is expensive and redo everything else.
Second criterion, land value
In sectors where the land is worth more than the building on it, teardown and rebuild often become rational. That is what drives the very active teardown market in Laval, Brossard and parts of Saint-Léonard.
The calculation is easy to set up. If land value plus new build cost stays below the finished property value, rebuilding stands up. Otherwise renovation is the better call.
Third criterion, the scale of code upgrades
An older building often carries electrical work to redo, plumbing to replace, no insulation and no ventilation. Taken separately, each of those looks reasonable. Added together they sometimes approach the cost of new construction.
The classic trap is the cascade effect. You open a wall for the electrical, you discover the insulation, you then have to redo the finishes, and the initial budget is blown before the job is half done.
Fourth criterion, hazardous materials
Asbestos changes the calculation both ways. In renovation, every wall opened can trigger a contained removal phase, with successive stoppages. In demolition, removal happens in a single planned operation.
On a heavily asbestos laden building, phased renovation often ends up more expensive than demolition, precisely because you pay to set up containment several times over.
Fifth criterion, the regulatory framework
In some Montréal boroughs, notably the Plateau and heritage sectors, demolishing an older building is hard to obtain and can be refused. The replacement project has to convince a committee.
In that case the question barely arises. Heavy renovation, or selective demolition with façade retention, becomes the only workable route.
The figure that is almost always missing
In most of the decisions we see, the owner has a detailed renovation estimate and no serious demolition estimate. So they compare a precise figure against an intuition.
Getting a firm demolition quote, with and without foundation removal, costs one free visit and gives you the second term of the comparison. That is often the moment the decision becomes obvious.
Frequently asked questions
Yes, and that is exactly why the quote is free and without obligation. Many of our visits exist to give a firm figure to someone still weighing options. You leave with the real amount, not a rough estimate.
Often yes. We can remove a storey, an extension or the whole rear while the rest stays standing, with shoring. That lets you keep what has value and rebuild what does not.
It is cleaned, cleared of all debris and levelled. Be careful though, in several Montréal boroughs the demolition authorisation is conditional on presenting a replacement project. That point needs checking before you commit.
