Free House Rewiring Cost Calculator
Estimate the cost of rewiring your home based on property size, bedrooms, floors, and location. Includes Part P certification costs.
House Rewiring Cost Calculator results
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This rewiring cost calculator gives homeowners and landlords a realistic estimate for a full or partial house rewire in the UK. Enter your property size, number of bedrooms, floors, and postcode to see estimates based on what electricians actually charge in your area. Rewiring is one of the most disruptive and expensive electrical jobs: use this tool to budget accurately before getting quotes.
How to use the House Rewiring Cost Calculator
- Enter your property's total internal floor area in square metres.
- Set the number of bedrooms and floors.
- Toggle whether the property will be occupied during the work. This affects duration and cost.
- Enter your postcode. We use real local electrician day rates to adjust the estimate for your area.
- Review the estimated cost range and timeline. Always get at least three quotes.
How the House Rewiring Cost Calculator works
A rewire is a regional price estimate, not a fixed formula. The dominant cost is labour over several days, which tracks floor area, so the honest way to sketch it by hand is a rate per square metre with adjustments for the things that add days.
- 85 m² 3-bed semi, national rates: 85 × £35–£50 = £2,975–£4,250 base.
- Two floors (×1.10) and occupied during work (×1.20): × 1.32 ≈ £3,930–£5,610.
- Add ~£300 for Part P certification → roughly £4,200–£5,900, in line with Checkatrade's £4,000–£6,000 benchmark for a 3-bed semi (2026).
This is a cost breakdown, not an engineering formula. The per-m² rate is calibrated to real UK electrician pricing. It assumes a standard property; access problems, solid walls, or a new consumer unit and earthing upgrades can push the real quote higher. Always get at least three quotes.
Typical UK benchmarks
- UK Average Rewire (3-bed)
- £4,000-£6,000 for a 3-bed semi (Checkatrade House Rewiring Cost guide, 2026)
- London Premium
- London and the South East run higher; ask for local written quotes rather than applying a national uplift
- Part P Certification
- £200-£400 typical local-authority building notice fee for notifiable domestic electrical work (Checkatrade: How to Get a Part P Electrical Certificate, 2026)
Frequently asked questions
How much does it cost to rewire a house in the UK?
According to Checkatrade's 2026 cost guide, a full rewire for a 3-bed semi typically costs £4,000-£6,000, with smaller flats costing less and larger detached houses more. London and the South East run higher, though the size of that gap varies too much by property and borough to state as a single percentage. These costs include first fix (cables), second fix (sockets/switches), a new consumer unit, and Part P certification.
How long does a full rewire take?
A typical 3-bed house takes 5-8 working days. Larger properties or occupied homes may take 7-12 days. The work is done in two phases: first fix (running cables through walls/floors/ceilings) and second fix (fitting sockets, switches, and light fittings). There is usually a gap between phases for plastering.
Do I need to move out during a rewire?
It is not essential but strongly recommended. During a rewire, the electricity is off for extended periods, floorboards are lifted, and there is significant dust. If you stay, the electrician must work room-by-room which takes longer and costs more. Budget an extra 15-25% for an occupied rewire.
What is Part P and do I need it?
Part P of the Building Regulations covers electrical safety in dwellings. Any notifiable electrical work (including a full rewire, new circuits, or consumer unit replacement) must be either done by a registered electrician (NICEIC, NAPIT, etc.) who self-certifies, or inspected by Building Control. The certificate is needed when selling the property.
How do I know if my house needs rewiring?
Signs include: old round-pin sockets, fabric-covered cables, a fuse box with rewirable fuses (no MCBs or RCDs), frequent blown fuses or tripped breakers, burning smells, or an EICR with C1/C2 codes. Houses wired before 1980 should be inspected. Properties over 40 years old almost certainly need rewiring.
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