From Enquiry to Final Account: How a Building Contractor Manages Your Project's Costs

If you have never commissioned a significant building project before, the money side can feel like a black box. You receive a price, work starts, invoices arrive, and at the end there is a final account. What happens in between?

At Crescent Builders we think clients deserve to understand the journey. A clear commercial process protects you, protects us, and keeps the relationship focused on building well rather than arguing about money. Here is how the cost path typically runs on a building project in Edinburgh and the Lothians.

1. Enquiry and early conversation

It starts with a conversation. What are you building, where, and roughly when? Do you have drawings, a planning consent or a building warrant? Is there an architect, engineer or quantity surveyor already involved?

At this stage, we are trying to understand the scope and whether the project is a good fit. If the design is still developing, we may be able to give an early budget view, but that is a guide, not a fixed price.

2. Pricing the work

To give a proper price, we need enough information to understand what is being built. That usually means drawings, specifications and any engineer's details. Some clients provide a bill of quantities or a schedule of works prepared by their own QS. Others ask us to measure from drawings.

Either way, the price is built up from labour, materials, plant, subcontractors, site set-up, supervision, insurances and overheads. Where information is missing, you might see provisional sums, which are allowances for work that cannot yet be fully priced, or exclusions, which are things not included.

Read these carefully. They tell you where the price could move.

3. Clarifying and agreeing the contract

Before work starts, the price, programme, scope, payment terms and how changes will be handled should all be written down. In Scotland, many projects use standard forms from the Scottish Building Contract Committee (SBCC), which adapt JCT contracts for Scots law. Smaller jobs may use simpler written agreements.

Whatever the form, you should know:

• What is included and excluded.
• How and when payments are made.
• How variations will be instructed and priced.
• Whether retention applies, and how it is released.
• What happens if the programme changes.

4. Interim valuations during the build

On most projects, the contractor is paid in stages as work progresses rather than in one lump sum at the end. These stages are often monthly interim valuations. The value of work done to date is assessed, sometimes along with materials delivered to site, and an application for payment is made.

On larger projects, the client's QS or contract administrator checks the valuation and certifies what is due. On smaller projects, the client may review it directly. Our guide to interim valuations explains this stage in more detail.

5. Managing changes

Very few projects finish exactly as drawn. Clients change their minds, hidden conditions are found, or design details evolve. These changes are called variations, and they need to be instructed, priced and agreed.

The golden rule is to agree changes in writing, ideally with the cost and time impact understood before the work is done. That avoids surprises at the end.

6. Practical completion

When the work is substantially finished and the building can be used, the project reaches practical completion. Any minor outstanding items are listed as snags and dealt with. If retention has been held, part of it is often released at this point.

7. The final account

The final account brings everything together: the original contract sum, adjusted for variations, provisional sums replaced with actual costs, and any other agreed adjustments. It is the final, agreed value of the project.

A well-managed project should have very few surprises at final account, because changes have been agreed along the way. If the final account is a shock, something went wrong earlier in the process.

8. Defects period

After practical completion, there is usually a defects period, during which the contractor returns to fix any defects that appear. At the end of it, any remaining retention is released.

Why this matters to you

A clear cost path means you know where your money is going, you can plan your funding, and you can make decisions about changes with full information. It also means the contractor can run the job properly, pay suppliers and subcontractors on time, and keep the site moving.

The short version

Enquiry, pricing, contract, interim valuations, managed variations, practical completion, final account and defects period. If each step is clear and written down, the money side of a building project becomes much less stressful.

The same cost path applies on a home renovation. When the drawings are ready, request an estimate.