A renovation budget should cover more than the contractor's headline price. Separating the major cost categories early helps you understand what is committed, what is still an allowance and where changes could affect the final total.
List the main work packages such as demolition, structural alterations, roofing, windows, mechanical and electrical work, plastering, joinery, finishes and external works. A clear scope provides the basis for meaningful contractor pricing.
Allow separately for architects, engineers, quantity surveyors, party-wall advice, planning or building-control fees and specialist surveys where relevant. These costs may sit outside the contractor's quotation.
Create a separate budget for kitchens, sanitaryware, appliances, flooring, decorative lighting, fitted furniture and other products you intend to buy directly. Include delivery and realistic lead times as well as the purchase price.
Some work cannot be accurately priced until the building is opened up or the design is complete. Keep provisional sums and uncertain quantities visible rather than treating them as fixed final amounts.
Confirm whether quotations are inclusive or exclusive of VAT. Keep a contingency appropriate to the condition, design maturity and complexity of the project rather than committing every pound of the budget to the initial contract sum.
Once work begins, record approved variations, client purchases and allowance adjustments against the original budget. A simple live cost plan makes it easier to see the effect of decisions before the project reaches completion.
There is no single percentage that suits every project. The appropriate allowance depends on design completeness, the age and condition of the property, access, structural uncertainty and how many selections remain unresolved.
Your overall affordability assessment should consider VAT where it applies. Always check whether individual quotations and professional fees are presented inclusive or exclusive of VAT so you compare the same basis.
Separating them helps you distinguish the contractor's construction price from products you control directly, while still allowing for installation, delivery, storage and coordination costs.
A practical UK guide to finding suitable builders, checking company information, comparing quotations and choosing who to speak to before appointment.
Read guide →A practical UK checklist for comparing builders, checking company details, insurance, experience, programme, scope, exclusions and payment terms before appointment.
Read guide →Use these practical questions before appointing a UK builder or construction company for an extension, refurbishment, loft conversion or renovation.
Read guide →Describe the work, location, approximate value and timing so relevant construction companies can assess whether the opportunity fits.
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