Structure & envelope

Foundation & waterproofing

The category where the diagnosis matters more than the repair. Most wet basements are surface water problems solved by grading and downspouts; some are not. Paying for excavation when you needed a downspout extension is the most common expensive mistake in this trade.

Also called: Basement waterproofing · Weeping tile · Crack injection

Scope

What the work is—and what it isn’t.

Most disputes begin with an exclusion nobody read. Confirm both columns against any quote you receive before comparing prices.

Normally included

Diagnosis of the water path
Interior or exterior remediation as appropriate
Crack injection, where the crack is the problem
Weeping tile, membrane and drainage layer on exterior work
Sump pit, pump and discharge
Backwater valve, where sewer backup is the issue
Restoration of grading, walkways and landscaping disturbed by excavation

Normally excluded

Structural repair of a failing wall
Mould remediation of affected finishes
Interior finishing

What moves the price

Why two quotes for the same room differ.

These are the decisions and conditions that actually drive cost on this trade. Understand them and a wide spread between quotes usually explains itself.

01
Whether the fix is exterior excavation, interior drainage, or simply grading and downspouts. These differ by an order of magnitude.
02
Depth of the foundation and access for equipment. A tight side yard changes the method.
03
Length of wall treated.
04
Whether interior finishes must be removed and rebuilt.
05
Municipal backwater valve requirements and any available subsidy.
06
Restoration afterwards — decks, walkways and mature planting are real costs.

Cost ranges

What it costs in Halton.

Cost ranges for this trade have not been published yet.

Rather than repeat a national average that means nothing in Halton, this table stays empty until the figures are ones I have priced myself. The cost drivers above are the part that matters most anyway—they explain why the numbers vary.

If you want a real number for your property, that is what the walkthrough is for.

Book a free walkthrough →

Before you sign

What the quote must contain.

If any of these is missing, ask for it in writing before you compare prices. A quote that cannot answer these questions is not a quote—it is an estimate wearing a suit.

A written diagnosis explaining where the water is coming from and why
The specific method, and why it was chosen over the alternatives
Whether downspouts, grading and window wells were assessed first
Warranty — transferable or not, and what voids it
Restoration of disturbed ground included or excluded
Permit requirements for a backwater valve

Walk away

Red flags on this trade.

None of these are matters of taste. Each one has a specific consequence, and each is visible before you commit any money.

A quote for excavation with no diagnosis
Free inspection that always concludes with the most expensive solution
Pressure to sign the same day
A 'lifetime warranty' with no written terms or transferability
No discussion of gutters, grading or window wells

Before the final payment

Watch the house during the first real rain
Sump pump tested, with a discharge that carries water away from the foundation
Backfill settled and re-graded away from the wall
Warranty document in hand, in the company's registered name

Agree a written deficiency list before releasing the last payment. It is the only leverage that survives the end of a job.

If you are selling

What this does to a sale.

Disclose it, with the paperwork. A documented, warrantied waterproofing repair is a far smaller negotiating point than a stain a buyer's inspector finds and you cannot explain.

Ready to hire

I’ll give you one or two names, not a directory.

Contractors on the bench supply current WSIB, liability insurance and licence documentation, and I have walked their finished work. No referral fee is accepted from any of them.

Request an introduction See the vetting standard →

Also worth reading

Reading a quote & protecting yourself→All trades and specialties→Free renovation walkthrough→

A straightforward first conversation

Thinking about foundation & waterproofing?

Tell me where you are in the process. We’ll discuss the property, the market, and the questions that matter most to you.

Book a consultation