Early cost estimates for UK residential architects
Use Proper Job to explore extension and refurbishment budgets during concept design. A Guide Price provides an early range with scope, assumptions and unknowns visible for the client discussion.
From concept to client discussion
- Enter the work type, approximate area, postcode area, finish and known site constraints. Include alterations to the existing house.
- Review the range, allowances and exclusions against the client’s brief. Flag unresolved structure, drainage and specification.
- Explore changes to scope or finish, keeping the assumptions consistent when comparing options.
- Use a Detailed Estimate when PDF drawings support measurements you can review. Undecided work remains an allowance or item to confirm.
Examples and method
Kitchen extension: range, assumptions and exclusions · Refurbishment: drawing-based Detailed Estimate
Illustrative demos, not architect case studies or verified final costs.
Proper Job uses stored rates and calculation rules, with regional adjustments, project-specific allowances, site setup, risk and margin—not floor area alone. Read the calculation method and limitations.
Where professional judgement remains essential
Use the output as a budget discussion aid, not a tender price or independently verified QS cost plan. Check it against the design, local quotations and project risks. For substantial or complex work, involve an independent residential QS.
More cost drivers do not, by themselves, prove greater accuracy.
Try it on a project
First Guide Price free, then £9.99 inc VAT. Detailed Estimate £29.99 inc VAT.