Most families who go over budget on a new house did not sign a bad price. They signed a vague one. The number on page one looked firm, but the drawings were thin, the specification said "builder's standard," and nobody had defined what "lock-up" meant. Then the extras started.
Canadians are not alone with this problem. Builders and homeowners in the United States, Germany and Poland face the same risks, and each country has developed its own habits, and in some cases laws, to manage them. Looking at how they do it is a useful way to check your own contract. Here are eight common myths and what actually protects you.
Myth 1: A fixed-price contract means the final bill is fixed
Fact: A fixed-price (stipulated-price) contract fixes the price of the work it describes, and nothing more. In Canada the gaps usually hide in two places. The first is allowances, where cabinets, flooring, lighting or plumbing fixtures are listed as a dollar amount instead of a product. The second is exclusions, such as rock or high groundwater when digging the basement, a long service run on an acreage, winter heating and hoarding for concrete, or engineering for snow loads. Germany handles this by law. Since 2018 a consumer building contract there must include a detailed building description, the Baubeschreibung, and unclear points in it are generally read against the builder. Canada has no general rule like this, so you have to do the work yourself. Ask for a written list of exclusions, make sure the allowances match what you actually plan to choose, and price-check them before you sign.
Myth 2: Cost-plus is a blank cheque
Fact: Cost-plus means you pay the actual costs of labour and materials plus the builder's fee. It is common for custom homes in Canada and the US, especially on difficult sites or when the design is still changing. It only becomes a blank cheque when the contract is silent. Protect yourself with these terms:
- Open books, with copies of supplier and trade invoices.
- A fixed fee rather than a percentage, so the builder earns nothing extra when costs rise.
- A target budget, ideally with a guaranteed maximum price.
- Regular cost-to-complete reports.
Standard forms exist for both models. In Canada the industry's CCDC documents cover stipulated-price and cost-plus contracts, and Americans often work from AIA-style forms. Many residential builders use their own contract, which is fine, but compare it clause by clause with a standard form or have a construction lawyer review it.
Myth 3: A big deposit secures your place in the schedule
Fact: A deposit pays for something you don't have yet. German consumer law limits how far a builder's payment requests can run ahead of the work. Before completion, instalments may not exceed 90% of the price, and the builder must provide 5% security for timely, defect-free completion with the first instalment. Polish homeowners usually pay a modest advance and then pay by stage. In Canada, keep the deposit proportionate and ask what it buys, for example permit drawings or long-lead items such as windows. Also check whether your province's new home warranty program covers deposits under your type of contract. Building on your own lot is sometimes treated differently from buying from a builder.
Myth 4: Monthly payments are simpler than stage payments
Fact: Pay for progress, not for the calendar. Poland has made this a national habit. Buyers talk about stan zerowy (foundations), stan surowy otwarty (walls and roof), stan surowy zamknięty (windows and doors in) and stan deweloperski (ready for finishes), and each one triggers a payment. The Canadian equivalents are foundation and backfill, framing and roof, lock-up, rough-ins and insulation, drywall, substantial completion, and final. Define each stage in writing, ideally linked to a passed municipal inspection. If you have a draw mortgage, match the builder's schedule to your lender's draws. Otherwise you may owe money the bank won't release until its appraiser visits.
Myth 5: Holding back money shows you don't trust the builder
Fact: In most provinces it is the law. Lien legislation in the common-law provinces generally requires the owner to hold back a share of each payment, typically 10%, for a set period after substantial completion. Unpaid subcontractors and suppliers can register a lien against your property, and the holdback protects you from paying twice. On a $700,000 build that is roughly $70,000, so plan your cash flow around it. Quebec uses a different system, so ask your notary. Americans have no uniform holdback and rely instead on conditional and unconditional lien waivers collected from trades with every draw. Asking your builder for proof that trades were paid, such as a statutory declaration, borrows the best of that practice. Germans often keep a separate 5% retention against defects. Poland and Germany both give homeowners about five years of statutory liability for building defects. In Canada, look at your provincial warranty program and the contract's own warranty terms.
Myth 6: Small changes can be agreed on site
Fact: A "small" change agreed by phone becomes a large invoice in month nine. Every change should be a written change order, priced and signed before the work, with its effect on the schedule stated. The contract should also set the markup on changes in advance. German law gives the owner a right to order changes, with rules for adjusting the price. In Canada this depends entirely on your contract. Changes are cheapest on paper. Decide before signing whether you want a finished basement, a basement bathroom rough-in or an extra bedroom downstairs, as in this five-bedroom bungalow, rather than after the framers leave.
Myth 7: Delays are the builder's problem
Fact: Unless the contract says otherwise, delays cost you: rent, storage, interest, and possibly an expired rate hold. Your contract needs four things:
- A start date.
- A completion date or a number of working days.
- A list of excused delays, such as permits, severe weather and your own changes.
- A daily amount the builder pays if they miss the date without an excuse.
In Germany a capped contractual penalty, the Vertragsstrafe, is a normal clause. In Canada, also settle who pays for winter work, and define completion as an occupancy permit, not "mostly done."
Myth 8: The house plan can be finalized after signing
Fact: A contract can only fix the price of what its documents describe, so a complete plan is your best protection against extras. Attach these to the contract:
- The full drawing set: foundation, floor plans, elevations, sections and details.
- A specification covering wall and ceiling R-values, window performance, HRV, heating system and finishes.
- The stage definitions and payment schedule.
- The permit set and any engineering.
Compare two bungalows from our plans with a basement. A four-bedroom design of about 1714 sq ft with a full lower level and a Mountain-style plan that fits five bedrooms into 1607 sq ft each show the basement on paper, so the builder prices it instead of guessing.
The same logic applies when a plan was drawn for a warmer climate. A Cape Cod-inspired two-storey, a farmhouse with three bedrooms and a big open main floor or a compact cottage of about 1700 sq ft without a garage may need a foundation, frost protection and wall assemblies adapted by a local designer to meet your provincial code. Have that adaptation done before you ask for prices. Otherwise "foundation to be confirmed" becomes the biggest extra on your bill. Browse one-storey and two-storey plans with the full drawing set in mind, not just the floor plan.
The short version
Other countries reach the same protections in different ways. Germany writes them into law, Poland into well-known payment stages, and the US into lien waivers. In Canada, most of them depend on what you put in your contract. Before you sign, check that you have:
- A clear pricing model, with exclusions and allowances listed.
- Payments tied to defined stages and your lender's draws.
- The statutory holdback in your cash flow plan.
- Written change orders with an agreed markup.
- Dates, excused delays and a daily penalty.
- A complete house plan and specification attached to the contract.
Rules vary by province and change over time. Have a construction lawyer or notary review the contract, and confirm holdback and warranty rules with your provincial authority before you commit.
