Use an integrated renovation baseline
The calculator multiplies existing home area by light, mid-range, or major/full-renovation level, then adjusts for condition, finish/specification, and structural scope. It offers limited incremental allowances for exceptional roof, electrical, plumbing, HVAC/heating, windows, and foundation/structural work. Those are not complete standalone-project totals.
Build one coordinated project budget
| Workstream | Planning question |
|---|---|
| Rooms and finishes | Which kitchens, bathrooms, flooring, paint, doors/windows and finishes are in the integrated scope? |
| Structure and strip-out | What is known, what needs investigation, and which structural work requires separate design? |
| Systems | Which electrical, plumbing, heating/HVAC, insulation and ventilation scopes are normal versus exceptional? |
| Logistics | How will access, storage, waste, protection, procurement and temporary living be managed? |
| Risk | Which allowances or contingency concepts address hidden conditions and scope changes? |
Use specialist calculators selectively
Kitchen Remodel and Bathroom Remodel are useful deep scopes inside many renovations, which is why they are the only representative related calculators here. Flooring, painting, electrical, plumbing, HVAC, windows, insulation, and demolition retain their specialist guidance; do not mechanically add their full totals to the integrated renovation estimate.
US and UK terms and requirements differ
Use USD, square feet, remodel/renovation terminology and project-specific local permit requirements.
Use GBP, square metres, renovation/refurbishment terminology and project-specific planning, Building Regulations, and building-control checks.
Allow for unknowns without a fake percentage
Existing-condition discoveries, structural issues, hazardous materials, access, procurement, approvals, occupancy, and scope changes can alter a project. A contingency concept should be agreed with the design and contracting team; this guide does not prescribe one universal percentage.
Build a whole-house renovation range
Select the integrated renovation level and only genuine exceptional allowances, then use room specialists to define—not duplicate—the project scope.
Plan with the right calculator
Enter your project details and select the United States or United Kingdom market for Low, Typical, and High planning estimates.
Frequently asked questions
Is the whole-house estimate the sum of all specialist calculators?+
No. It uses an integrated area and renovation-level model to avoid double-counting overlapping labour, overhead, and finishes.
Can people live in the property during renovation?+
Sometimes, but feasibility depends on safety, utilities, access, dust, room sequencing, and household needs. Confirm the project plan rather than assuming occupancy is practical.
Does the calculator include an extension?+
No. It covers existing home area; additions and new-space projects are separate.
Is all-at-once always cheaper?+
No. Coordination may reduce repeated mobilisation, while cash flow, discoveries, occupancy, procurement, and contractor strategy can alter either approach.
Sources & references
- Renovation, Repair and Painting Program · U.S. Environmental Protection Agency
- Energy Saver · U.S. Department of Energy
- Building Regulations · GOV.UK
- Planning Permission · Planning Portal
- Whole House Renovation Cost · Angi
- House Renovation Cost · Checkatrade