Construction Quotation Guide for Small Contractors

Construction jobs combine big numbers, long timelines and unknowns hidden in the ground or behind walls. A careful quotation protects your margin and heads off most arguments.

Base it on a site visit

Measure on site whenever you can. Check access for trucks, storage space, water and power, and neighbours who might be affected. A drawing rarely tells you all of this.

Break it into stages

Rather than one figure, group the work in the order it happens:

• Site preparation and excavation
• Foundation and structure
• Masonry and roofing
• Electrical and plumbing rough-in
• Plastering, flooring and finishing

Showing quantities and rates, such as cubic metres of concrete or square metres of plaster, makes your price easier to check and easier to adjust.

Be clear about what's excluded

Common exclusions are permits and government fees, soil testing, drawings by an engineer, boundary walls, furniture and landscaping. Say who pays for each.

Plan for variations

Hidden problems are normal. Add wording such as: "Rock excavation, unforeseen ground conditions and client-requested changes are charged separately and agreed before work proceeds." Record every change in writing.

Payment stages

Tie payments to visible progress, for example: 20% mobilisation, 30% after foundation, 30% after structure, 20% on handover. Make sure you're never funding too much of the client's project yourself.

Handle material price risk

Long projects are exposed to rising prices. See how to quote when material costs change. Keep your validity period short, or name the materials subject to price changes.

For large contracts, use a formal agreement drafted by a professional. The quotation is a starting point, not a substitute.

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