Extend or Move in Milton Keynes? 2026 Market Reality
A Flat Market Is Exactly When Extending Beats Moving
The numbers this month all point the same way: still, patient, going nowhere fast. If you've been staring at your growing family and your shrinking hallway wondering whether to sell up or build out, the market has quietly made the case for you.
THE MARKET IN PLAIN TERMS
On 29 July the Bank of England held the base rate at 3.75%. That wasn't the easy hold some expected three of the nine committee members actually voted to raise it, worried that higher energy prices are keeping inflation sticky (it ticked up to 2.9% in July). The next decision lands on 17 September. The plain-English takeaway: borrowing costs are steady for now, and the widely assumed run of further cuts is no longer a sure thing.
House prices are barely moving. Nationwide put annual growth at just 1.8% in July (down from 2.2% the month before), with the average home effectively flat at £277,542. The Lloyds index the same measurement that used to carry the Halifax name had annual growth at just 0.1%, the slowest since November 2023.
Closer to home, Milton Keynes is softer still. The ONS provisional average sat at £325,000 in May, and local asking prices have drifted down around 2.1% over the past six months. Translation: sellers are trimming expectations, and homes are taking longer to move.
Here's why that matters for the extend-or-move question. In a flat market, the costs of moving don't get flatter. Stamp duty, estate agent fees, legal costs, survey fees and removals still add up to tens of thousands of pounds — money that buys you the disruption of a chain, not a single extra square metre of the home you actually want. When prices were racing upward you could hope the next house would "grow into" its price tag. In a still market, that hope is gone, and the maths of staying put and building out gets a lot more persuasive.
THE PLANNING REALITY
You may have seen headlines this month about new permitted development rules coming into force on 27 August. They're real but read the small print. The changes cover solar equipment on homes and a new category for reverse vending machines at shops. They do not change the rules for house extensions.
So the extension baseline is exactly what it was: a single-storey rear extension can typically go 3 metres from the original rear wall on a terraced or semi-detached house, and 4 metres on a detached one, under permitted development. Larger projects up to 6 metres, or 8 metres on a detached home can be possible under the prior approval route (the Neighbour Consultation Scheme), where the council checks with your neighbours before deciding.
One thing worth clearing up, because it trips people up constantly: a Lawful Development Certificate is not planning permission. It's the council's formal confirmation that your work is lawful under permitted development. It's also separate from Building Regulations, which cover how the thing is actually built. Different documents, different jobs and knowing which you need before you start saves a lot of grief.
Despite the occasional headline, no expansion of extension rights has become law. Proposals and consultations have floated bigger allowances for years; until one actually passes, the current rules apply.
WHAT IT MEANS FOR YOU
If your reason for considering a move is "we need more space," a flat market tilts the decision toward improving rather than moving. You keep your postcode, your neighbours, your children's school run and you avoid pouring tens of thousands into the cost of transacting. You spend that money on the space itself instead: the kitchen-diner that finally fits everyone, the extra bedroom, the home office that isn't the corner of a landing.
None of this is a reason to rush. Steady rates and soft prices mean there's no clock ticking against you. It's a good moment to get clear numbers and a realistic plan before you commit to anything.
Don't move. Improve (AL it).
WHAT TO DO NEXT
Start with the free 60-second cost calculator on al-haitham.co.uk. pop in your project and get a realistic ballpark for what your extension could cost, no strings.
Want to talk it through with a person? Book a free 15-minute call, or message us on WhatsApp at +44 7404 086195. We'll give you a straight answer about what's realistic for your home and your plot.
When you're ready to go further and want a proper, tailored assessment of what your property can take, our £195 Feasibility Blueprint is the next step and it's fully credited to your project if you go ahead.
AL-Haitham Ltd, house extension architects, Milton Keynes & London. 15+ years, 300+ projects, rated 5.0 on Google. Precision Has No Borders.
General market commentary, not financial advice.