The 25-Year Council Tax Gap: Cheapest vs Dearest Outside London 2026

Dorset's council tax bill for 2026-27 is £2,765.02 at Band D — higher than every single London borough, including Kingston upon Thames (£2,609.20), London's own most expensive. Windsor and Maidenhead, meanwhile, charges £1,952.62: the lowest Band D rate of any English authority outside the capital. The gap between the two, held flat at today's rates, adds up to £20,310 over 25 years of ownership. Dorset is also, on Land Registry figures, the far cheaper place to actually buy a home.

Homecost's postcode tool shows the full cost breakdown — mortgage, council tax, stamp duty and energy rating — for any Dorset or Windsor and Maidenhead address. Here is what the underlying data says about the two authorities.

The headline pairing

Sources: HM Land Registry Price Paid Data (2025 sales, categorised A, detached/semi-detached/terraced/flat), gov.uk council tax statistics (2026-27 Band D), HMRC SDLT calculator, EPC register — all fetched 2026-10-14.

Windsor and Maidenhead's median sale price is 58% higher than Dorset's, yet its council tax is 29% lower. Council tax bands are set against 1991 property values in England and have never been revalued (Local Government Finance Act 1992); a council's Band D charge reflects local spending needs and its overall tax base, not what homes are selling for today. Few authority pairs in England make that gap as visible as this one.

Dorset beats every London borough — a genuine outlier

The usual pattern in England's council tax data is that the very cheapest bills cluster in London, because inner boroughs combine a large commercial tax base with high property values. Of the 296 English billing authorities, only seven charge a lower Band D rate than Windsor and Maidenhead's £1,952.62 — and all seven are in Greater London.

Cheapest council tax outside London, 2026-27 Band D. Source: gov.uk council tax statistics.

Dorset sits at the opposite end — and not just relative to other shire counties. At £2,765.02, it is more expensive than every one of the 33 London boroughs, including Kingston upon Thames (£2,609.20) and Croydon (£2,599.91), which usually top London's own expensive end.

Priciest council tax outside London, 2026-27 Band D. Source: gov.uk council tax statistics.

Price and council tax move independently

The Dorset/Windsor and Maidenhead pairing is a sharp example of a pattern that holds across England: house prices and council tax bills are set by different mechanisms and don't track each other. Band D reflects a fixed 1991 valuation band, local authority budgets and the size of the local tax base (see Homecost's cheapest council tax outside London ranking for the fuller national picture); sale prices reflect current demand, location and housing stock. A county with lower-value homes on average, like Dorset, can still carry a high Band D charge if its tax base per head is smaller or its budget pressures — adult social care in particular tends to weigh heavily on county-level budgets — are greater.

Homecost's Windsor and Maidenhead council tax piece covers that borough's own figures in more detail, including the price spread between its priciest postcode (SL5, around Ascot) and its two namesake towns.

What the gap is worth over time

A single year's £812.40 difference between the two Band D bills doesn't look dramatic next to a six-figure deposit or a stamp duty bill. Held at today's rates across a 25-year ownership horizon — a straightforward multiplication, not a forecast of how either council will set future budgets — the two bills diverge by £20,310. That is a smaller gap than the sharpest version of this comparison anywhere in England, Wandsworth vs Dorset over 25 years, where Dorset's Band D bill sits £1,736.81 a year above Wandsworth's — London's own cheapest. But the Windsor and Maidenhead comparison is arguably the more telling one: it has nothing like Wandsworth's exceptional inner-London tax base, yet still charges £812.40 a year less than Dorset.

On the mortgage side, the picture reverses. At a 75% loan-to-value, 25-year repayment mortgage and the Bank of England's quoted 5-year fixed rate of 4.32% (as of 1 April 2026), a buyer at Windsor and Maidenhead's £545,000 median would be repaying roughly £2,230 a month before tax and insurance, against roughly £1,412 a month at Dorset's £345,000 median — a gap of around £818 a month, which dwarfs the £68-a-month council tax saving Dorset buyers give up. The mortgage, not the council tax, remains the dominant cost in both places.

The first-time buyer relief cliff falls differently in each

First-time buyers pay no stamp duty on the first £300,000 of a main residence and a reduced rate up to £500,000; above £500,000, the relief is withdrawn entirely and a first-time buyer pays the same as any other mover. Dorset's £345,000 median sits inside that relief band, so a first-time buyer there saves £5,000 against the standard £7,250 bill, paying £2,250. Windsor and Maidenhead's £545,000 median sits above the £500,000 cliff, so a first-time buyer there gets no relief at all and pays the full £17,250 — identical to a mover. The authority with the cheaper council tax also, in this instance, offers first-time buyers nothing on stamp duty; the one with the more expensive council tax gives them a meaningful discount.

What the data can't show

These are Band D benchmarks and county/unitary-wide medians, not the value of any individual home or what any specific buyer would pay. A property's actual council tax band depends on its 1991 valuation, not its current price, and a parish or town council precept can add a further charge on top of the Band D figure quoted here. Mortgage costs will vary with an individual's deposit, lender and credit profile. Speak to a qualified adviser before acting on anything in this piece.

Try Homecost's tool with a Dorset postcode to see how the true cost breaks down for a specific street, or browse more location-planning guides for other council-tax and true-cost comparisons across England.