What to check before starting a full house renovation

A full house renovation is a big commitment. Before you sign a contract or swing a hammer, there are a few things worth checking. These are the issues that catch homeowners out and add time and money to a project.

Electrical panel capacity

Older UK homes often have old consumer units with rewireable fuses or outdated RCD protection. If you're adding an extension, a heat pump, an EV charger, or modern appliances, you'll likely need a new consumer unit and possibly a supply upgrade. This adds £500-£1,500 and requires coordination with the DNO. Check early.

Plumbing condition

If your home was built before 1970, the supply pipes may be lead — both are a health risk and a legal concern. A renovation is the time to replace them. Have a plumber camera-inspect your drains too. A collapsed drain under the floor can add £5k+ to your project.

Damp and timber

Have a surveyor check for rising damp, penetrating damp, and timber decay before planning any work. In older Cheshire properties, solid brick walls and single-skin extensions are prone to damp. Treating damp properly during renovation is far cheaper than doing it later when walls are plastered.

Asbestos

Homes built before 2000 may have asbestos in artex ceilings, floor tiles, pipe lagging, or garage roofs. Asbestos requires professional removal by a licensed contractor. This is not a DIY situation and it adds cost to demolition. Survey before you plan the strip-out.

SAP calculations and building regs

A full renovation in England requires building regulations approval for structural, electrical, plumbing, and thermal elements. If you're changing the thermal envelope — new windows, insulation, or roof — you'll need SAP calculations to demonstrate compliance. Your builder should handle all of this.

The takeaway

Spend £500 on surveys before you spend £100,000 on a renovation. The surprises you prevent are always more expensive than the surveys that find them.