Mortgage affordability gets all the attention, but the bills that arrive after completion are what actually shape monthly life in a home — and they vary enormously between two houses at the same price. A draughty EPC-F cottage and a compact EPC-B flat can differ by well over £1,500 a year on energy alone, before council tax bands, water metering and service charges widen the gap.
This guide walks through each running cost with realistic 2026 figures, shows which ones you can read from public data before you offer, and gives the maintenance rule of thumb most buyers only learn after their first big repair.
Energy — the cost the EPC predicts
Energy is the most property-specific bill, and the one public data predicts best. The EPC band summarises how much energy the building needs for heating, hot water and lighting; under the Ofgem price cap a typical dual-fuel household pays in the region of £1,700–£1,800 a year, but that "typical" hides the banding: a well-insulated B/C home can run hundreds of pounds below it, while an F or G home — solid walls, old boiler, single glazing — can run £1,000+ above.
The EPC itself lists the recommended improvements with indicative costs and annual savings, which is effectively a costed retrofit plan for the exact building. A home hovering near a band boundary (a high D, say) is often a few targeted jobs away from a C — worth knowing both for bills and because rental rules and green-mortgage products increasingly key off band C.
Sources: Ofgem — energy price cap · GOV.UK — find an energy certificate
Council tax — set by band and by council
Council tax depends on two things: the property’s band (A–H in England and Scotland, A–I in Wales, set from historic valuations) and what your specific council charges for that band. The average Band D bill in England is around £2,300 a year as of 2026, but identical bands vary by hundreds of pounds between neighbouring authorities, and the step from one band to the next is typically £200–£400 a year.
Band is public and fixed to the property, so it belongs on the pre-offer checklist rather than the post-completion surprise list. Single occupants get 25% off; some improvements can trigger re-banding on sale.
- Check the band, then the actual charge for that band on the local council’s website — the same band is not the same bill everywhere.
- A "cheap" house in a high band can cost more per month than a dearer house in a low band.
Sources: GOV.UK — check a council tax band
Water, insurance and the fixed layer
The remaining recurring bills move less with the building but still add up to a four-figure layer:
- Water and sewerage: averages around £600 a year in England and Wales. Metered homes pay by use — usually cheaper for smaller households; unmetered bills key off the old rateable value.
- Buildings and contents insurance: typically £250–£450 combined, rising sharply where flood risk, subsidence history or non-standard construction applies — one reason to check those risks before you are committed.
- Broadband, TV licence and the routine utilities: £500–£700.
- Leasehold flats add service charges (commonly £1,500–£4,000+ in purpose-built blocks, more with lifts, concierges or major works ahead) and ground rent on older leases — always read the last two years of service-charge accounts.
Sources: Water UK — average bills · ABI — home insurance premium tracker
Maintenance — the one nobody budgets
The industry rule of thumb is to set aside around 1% of the property’s value a year for maintenance and repairs — more for older, larger or non-standard homes, less for a recent flat where the freeholder handles the envelope. It will not be spent evenly: nothing for three years, then a boiler (£2,500–£4,000), a roof repair (£5,000–£12,000 for full replacement) or external decoration arrives at once.
Age band is the strongest predictor. Pre-1919 stock needs specialist materials and trades (lime mortar, sash windows, slate); interwar and post-war homes have their own known failure points; post-2000 homes mostly need routine servicing. This is why the same survey logic — older and odder means more — applies to the running-cost budget too.
Estimate a specific home before you offer
Almost all of the above is readable from public data for a specific address before you ever contact the agent: EPC band, score and floor area (bigger homes cost more to heat per band), council tax band, flood risk for the insurance question, property age band for the maintenance question, and tenure for the service-charge question. Try the calculator below with any EPC and council-tax band combination.
Illustrative only: energy figures are band-typical for an average 3-bed and swing with usage and prices; council tax uses the England Band D average (~£2,392 for 2026/27) scaled by the statutory ninths — your council will differ. Excludes water, broadband, insurance and maintenance.