A Flat Market and Held Rates: The Case for Improving in 2026
If you've been waiting for the housing market to "do something" before deciding whether to extend your home or trade up to a bigger one, this month is a useful reality check. Rates are holding, prices are barely moving, and "despite a run of eye-catching headlines" the rules for extending your home haven't actually changed. Here's what the latest figures mean for a Milton Keynes homeowner weighing up their next move.
The market in plain terms
The Bank of England held its base rate at 3.75% on 30 July 2026, the second hold in a row after June. The next decision lands on 17 September. Inflation is still running above the Bank's 2% target (CPI was 2.6% in June), and the Bank's own projection has it edging up toward the end of the year, so a quick return to cheaper borrowing isn't on the table right now.
House prices, meanwhile, have gone quiet. Nationwide's July index put annual growth at 1.8%, down from 2.2% the month before and the slowest pace in roughly 20 months, with the average UK home essentially flat month-on-month at around £277,500. Locally, the picture is the same story of patience: average asking prices in Milton Keynes sat near £379,000 in June, while Land Registry sold prices came in closer to £325,000. That gap between what sellers hope for and what buyers actually pay is the signature of a slower, choosier market.
For a homeowner, the takeaway isn't drama, it's calm. Prices aren't running away from you, and they aren't collapsing either. Which means the decision comes down to costs and how you actually want to live, not to timing a market swing.
The planning reality
You may have seen headlines this year promising "bigger extensions" and "new permitted development rules for 2026." Read them carefully, because the picture is more boring and more reassuring than the headlines suggest: the permitted development rules for house extensions have not changed. Proposals to expand them (for example, deeper rear extensions for terraced homes) have been floated in consultations and a private member's bill, but none of that has become law. When it comes to extending, the rules today are the same rules that applied last year.
The one permitted-development change that did come into force this year (on 27 August 2026) relates to solar panel installation "not extensions" so it doesn't affect a rear, side or wrap-around project.
In practice, that means the familiar baseline still applies: a single-storey rear extension is generally permitted up to 3m for a terraced or semi-detached house and 4m for a detached one, with larger 6m and 8m projects possible under the prior-approval "Neighbour Consultation Scheme." If your project fits inside permitted development, the smart step is a Lawful Development Certificate, the council's formal confirmation that your work is lawful under permitted development. It isn't planning permission, and it's separate from Building Regulations, but it's the document that gives you certainty on paper and makes life much easier when you come to sell.
What it means for you
Put the two halves together and a pattern emerges. Moving in a flat market is expensive: estate agent fees, legal costs, stamp duty and moving costs don't shrink just because prices have stopped climbing — and you rarely recover them when the home you're buying has barely moved in value either. Improving, by contrast, lets you spend on the part you actually keep: more space, better light, a kitchen-diner that fits the whole family, a home that works for how you live now.
And because the extension rules are unchanged, there's no reason to wait for a rule change that may never come. If your project fits permitted development, it fits today. If it needs planning, that route is exactly as it was. The uncertainty people are holding out for mostly doesn't exist.
None of this is a reason to rush. It's a reason to plan properly — to understand what your specific home can take, what it's likely to cost, and whether extending genuinely beats moving for your situation. That's a question worth answering with real numbers rather than headlines.
Work out your numbers
The quickest place to start is our free 60-second cost calculator at al-haitham.co.uk pop in a few details and get a realistic ballpark for your extension in under a minute.
Want to talk it through with a human? Book a free 15-minute call, or message us on WhatsApp at +44 7404 086195 no hard sell, just straight answers about whether your idea stacks up.
When you're ready to go further and pressure-test the design and feasibility of your specific project, our £195 Feasibility Blueprint is the next step and it's credited in full to your project if you go ahead.