Understand what is being priced and selected.

A build-up you can discuss

Start with an agreed system and recipe. Identify the required materials and the specific products proposed for them, so everyone can see what the estimate actually includes.

Make the quantity basis visible

Gross or net area, openings, ancillary materials and waste can change a wall estimate. Establish these explicitly; a material quantity does not automatically establish a complete installed cost.

Review a substitution

Assess the proposed replacement against the same requirements. Review its units, dimensions, supporting evidence, price basis and carbon scope before accepting a new evaluation.

Prepare a focused pilot

Bring one construction, its quantity basis and a supplier quotation. Use the walkthrough to establish which parts can be evidenced today and which decisions still need to be made.