Separate house construction from total investment
Start by listing the result you want to finance. Land acquisition, professional work, the building contract, pool, external works, connections and owner purchases are different budget headings. Some may be in one quotation and others in separate appointments. Make a single overview so that the sum of several contracts is not confused with the price of the house alone.
For each heading, record the current amount, the information behind it and its status: initial allowance, supplier quotation or agreed contract item. Use the same treatment for applicable taxes and administrative charges. Ask your advisers to confirm the treatment relevant to your circumstances rather than assuming that every advertised figure uses the same basis.
Ask what a square-metre rate actually measures
Before comparing rates, establish which area is measured. Enclosed accommodation, covered terraces, open terraces, garages and basements may be counted differently. Two prices can therefore describe different quantities as well as different specifications. Ask for the area schedule and the exact works covered by the rate.
Next look at exclusions. Excavation, difficult access, retaining walls, utility routes, kitchen equipment or landscaping can affect the total without increasing the quoted house area. This site does not publish an unverified universal rate. Request current project pricing based on your location, drawings and specification, and use any early rate only as a labelled assumption.
Make site-related allowances visible
The plot influences the scope before the first room is built. Access for machinery, existing structures, ground information, levels and the position of services all need investigation. Ask what evidence supports the allowances for preparation and foundations, and which items remain subject to further information. An unresolved condition should appear as an open budget question.
When comparing land, consider the likely work needed to create your intended house and outdoor spaces. A cheaper purchase may require a different construction solution. Your professional team can help identify what needs investigating; do not use the price of a neighbouring build as confirmation that the same assumptions apply.
Compare the same information and scope
Give contractors the same drawing revisions, product schedule and list of external works. Request explanations for exclusions, provisional sums, owner-supplied materials and the validity period of each offer. Put unresolved differences in a comparison table rather than choosing purely on the final total.
Look closely at fixtures and finishes: glazing, doors, cabinetry, sanitaryware, kitchen appliances and pool equipment. Ask whether installation, delivery and associated work are included. Where you intend to buy an item separately, confirm the responsibility for dimensions, delivery timing, storage and fitting. A low purchase price can still create coordination costs if the surrounding work is undefined.
Track changes against a current forecast
Agree how requested changes will be priced, approved and reflected in the programme before work proceeds. Keep the original scope, approved variations and remaining allowances visible. Update the forecast when you change a material or add a feature; several small upgrades can materially affect the total when combined.
Discuss a project-specific contingency with your team and keep it separate from optional spending. Review the reserve as information improves. For a meaningful first budget discussion, send the location, approximate floor area, available drawings and expectations for the pool and garden. If information is incomplete, the next useful step may be defining the scope rather than obtaining a single total.
A budget worksheet for your first review
Use these columns in a shared spreadsheet. Keep the date and source beside every figure, and update the forecast when an allowance becomes a confirmed item.
| Budget heading | Record before comparing | Still to confirm |
|---|---|---|
| Professional preparation | Appointment scope and quoted fees | Reports, surveys and technical coordination |
| Site and foundations | Ground information and included works | Open assumptions and provisional items |
| House construction | Drawing revisions and specification | Selections, exclusions and area basis |
| Pool and external works | Dimensions, equipment and surfaces | Levels, boundaries, planting and connections |
| Separate purchases | Supplier, delivery and installation scope | Who coordinates dimensions and fitting |
| Reserve and charges | Basis agreed with your advisers | Project-specific treatment and unresolved risk |
Related questions: Plots & feasibility · Comparing quotes · The process