How to Quote for Building Jobs Without Losing Money

Building jobs are some of the hardest to price because they involve so many variables. Here is a structured approach to quoting that protects your margins.

Break the job into phases

Do not try to price a whole project in your head. Break it down: groundworks and foundations, structural work, first fix (plumbing, electrics, plastering), second fix, and finishing. Price each phase separately using your known rates and material costs.

Measure everything

Take accurate measurements on site. Calculate material quantities properly rather than estimating. A 10% error on materials for a large extension can cost you thousands. Use a takeoff sheet or app to keep things organised.

Get material prices in writing

Call your merchants and get written quotes for materials before you finalise your price. Material costs can change quickly, especially for timber, steel, and concrete. Lock in prices where possible or add a material price variation clause to your quote.

Factor in subcontractors

If you are bringing in a spark, plumber, or plasterer, get their quotes before you finalise yours. Do not guess what they will charge. Add a small management margin on top of their price (5-10%) since you are coordinating and taking responsibility.

Allow for contingency

On renovation and extension work, unexpected issues are almost guaranteed. Old foundations that need underpinning, hidden asbestos, drainage problems, bad weather delays. Add 10-15% contingency to your total. Customers understand this if you explain it upfront.

Payment terms matter

For larger jobs, set up stage payments tied to milestones. For example: 10% deposit on acceptance, 25% on completion of foundations, 25% on reaching plate level, 25% on first fix completion, 15% on handover. This keeps your cash flow healthy and protects the customer too.

Present your quote professionally

Type it up properly with your business name, address, and contact details. Include a summary, a detailed breakdown, a timeline, your terms and conditions, and an expiry date (quotes are typically valid for 30 days). A professional quote beats a scribbled note every time.