Are exterior waterproofing quotes in Barrhaven priced by the foot or by the job?

Exterior waterproofing is priced per linear foot of wall on the published Ontario contractor pages: about $100 to $350, commonly $150 to $250, for excavation, membrane, drainage and new tile. A contractor can still give you one total for the job; what matters is that you can see the wall length behind it.

If a Barrhaven quote gives only a lump sum, ask the contractor to write in the wall length they are pricing, so you can divide it out and compare it with other quotes and with the published range. Deeper foundations and tight access cost more, and whether the drain tile is replaced changes the scope, so ask each quote to say:

• which walls, and how many linear feet
• whether the work is dampproofing or waterproofing, and why
• whether the drain tile is replaced, and where it drains
• what is finished inside, and whether anything inside is affected
• who pulls the building permit

On the Code side, dampproofing is required on a below-grade foundation wall where the finished ground outside is higher than the floor inside (9.13.2.1), and waterproofing is required where hydrostatic pressure occurs (9.13.3.1). The Code gives no number for that, so the quote should name which one it covers. The City of Ottawa lists "Structural foundation repairs and drain tile replacement" as permit work, so if new tile is in the scope, ask who applies for the permit and whether its fee is in the price.

Before signing, ask the contractor to confirm the wall length in writing, so a per-job total and a per-foot quote can be compared on the same footing.