Undeclared Work in Renovation: What the Homeowner Actually Risks

A contractor gives you two prices. With an invoice: $23,000. Without an invoice, paid in cash: $20,000. The gap is real, it corresponds roughly to the taxes, and in the moment it looks like obvious savings.

What the second price does not tell you is everything that disappears along with the invoice. And the contractor is not the only one taking a risk. You are too.

Here is what you actually risk, in the order it tends to hit.

Paying cash is not the problem

First distinction, because it matters and it is often misunderstood. Paying a contractor in cash is not illegal. Plenty of fully compliant transactions are settled in cash, with an invoice and taxes.

What creates risk is not the payment method. It is the absence of a paper trail: no written contract, no invoice, no GST and QST numbers, nothing that establishes who did what, when, and for how much.

A contractor who accepts a bank transfer but refuses to issue an invoice poses exactly the same problem as a cash payment with no receipt. The question is never "how do I pay", it is "what remains as proof".

If the work is bad, you have nothing

This is the most common risk by a wide margin.

Without a written contract you have almost nothing to stand on. No description of the agreed work, no reference price, no schedule, no warranty. If the result does not match what was discussed verbally, your word is worth theirs.

It gets worse. A contractor working off the books generally has no liability insurance applicable to that job, or cannot invoke it without exposing the arrangement. So even when the damage is obvious, there is no insurer to turn to. You end up suing an individual and hoping they have assets worth seizing.

And a claim for hidden defects becomes very hard to pursue when you can document neither who performed the work nor when.

If someone gets hurt at your place

This one almost nobody sees coming.

When an undeclared worker is injured on your job site, they are not protected the way a declared employee would be. The compensation regime that should normally step in does not apply the same way, and the injured person can turn to you, the property owner, for medical costs and lost income.

One serious fall on a staircase or a roof, and it becomes a personal lawsuit landing in your lap, with no insurer to defend you.

Your home insurance can deny the claim

Home insurance policies contain conditions about work performed on the property. A loss whose cause traces back to non-compliant work, or work done without a permit when one was required, opens the door to a denied or reduced claim.

The classic scenario: water damage or a fire where the investigation reveals a non-compliant installation. At that point the missing invoice works against you twice. You cannot demonstrate the work was done properly, and you cannot identify anyone the insurer could pursue.

At resale, you pay for it

In Quebec, a seller must declare the work performed on the property. Renovations with no invoice, no permit, or whose date and nature you cannot prove create three problems when selling:

• The seller's declaration becomes hard to fill out honestly, and an inaccurate declaration can follow you after the sale.
• The pre-purchase inspection may reveal a non-compliant installation, which turns into a price reduction or a withdrawn offer.
• If a problem surfaces for the buyer, you are the recourse, because there is nobody else to turn to.

Work that was done well but cannot be documented loses part of its value at the exact moment you try to cash it in.

No grants, no tax credits

Renovation assistance programs all require the same thing: detailed invoices, issued by an identifiable business, with its tax numbers. Rénoclimat, LogisVert, tax credits, municipal grant programs. Without a compliant invoice, the file is refused.

So the tax savings up front can cost you financial assistance worth considerably more.

The real math

On a $20,000 job, the gap between the two prices lands around $3,000. That is what goes on the scale.

On the other side: redoing badly executed work often costs more than the original job, because you have to demolish before rebuilding. A civil dispute runs into thousands of dollars and months of effort. A denied water damage claim easily exceeds $15,000. A lost grant can be worth several thousand.

The discount is certain and immediate. The risk is uncertain but far larger. That is a bet, not savings.

How to stay on the right side

Nothing complicated, and it comes down to five points:

• A written contract describing the work, materials, price, schedule, and exclusions.
• An invoice carrying the legal business name and its GST and QST numbers.
• The licence, when the work requires one. You can verify an RBQ licence in two minutes, and our guide explains how to read an RBQ licence properly, because an active licence does not necessarily cover the work you are asking for.
• The liability insurance certificate, current, with the coverage amount.
• The municipal permit when required. It also protects your seller's declaration years down the road.

For trades where a non-compliant installation carries serious consequences, it is worth starting from a pool of identifiable businesses. Our directories of electricians in Montreal and plumbers in Montreal gather qualified companies, and the general contractors page covers projects spanning several trades.

Frequently Asked Questions

Is it illegal for me to pay a contractor in cash?

No. Paying cash is legal. What is problematic is the absence of an invoice and the contractor not declaring the income. As the client, your exposure is not primarily tax related, it is civil: without a contract or invoice, you lose your recourse in case of defective work, damage, or an accident.

How do I know whether my contractor declares their income?

You do not have to investigate. Simply ask for an invoice with the legal business name and its GST and QST numbers, plus a written contract. A compliant business provides them without hesitation. A refusal, an excuse, or insistence on cash with no receipt gives you your answer.

Will my home insurance really deny a claim?

It depends on the policy and the circumstances. An insurer examines the cause of the loss. If it traces back to non-compliant work or work done without a required permit, the claim can be denied or reduced. It is not automatic, but it is a real and documented risk. Reread your policy conditions on work and alterations to the property.

What if work was already done off the books at my place?

Have the compliance assessed by a professional, especially for electrical, plumbing, and anything structural. If the work required a permit, ask your municipality about possible regularization. Document whatever you can reconstruct; it will help when filling out your seller's declaration.

Does the discount really match the taxes?

Often the announced discount exceeds the value of the taxes, which means other costs vanished too: liability insurance, contributions, sometimes the warranty. A price gap well above 15 percent between a quote with an invoice and one without is a sign that protection was removed along with the paperwork.