Most homeowners searching for planning costs land on one number: the application fee. In Windsor and Maidenhead, that's £548 for a standard householder application. But if that's where your research stops, you're probably underestimating what this is actually going to cost you — and what could go wrong. WhatCanIBuild exists precisely because the fee is the easy part.
The short version
- The householder application fee is £548, but that's rarely the full picture
- Windsor and Maidenhead has 966 listed buildings and significant Green Belt land — both can change everything about your project
- What gets approved or refused nearby matters more than the rules on paper
The fee is just the entry ticket
Beyond the £548, there's a Planning Portal service charge of £75.83 + VAT on applications with fees over £100 — so that's already an extra cost most homeowners don't factor in upfront. Then there are the professional fees: architects, planning consultants, structural engineers, heritage consultants. In a borough like Windsor and Maidenhead, where property constraints are anything but uniform, getting the wrong professional advice early can mean paying twice.
And that's before you hit a refusal. Resubmitting, appealing, amending drawings — each step has its own cost. The typical decision window is 8 weeks, but that clock doesn't start until your application is valid. An incomplete submission doesn't just delay things; it costs you time you've already paid for.
Windsor and Maidenhead isn't a uniform borough
This is where most homeowners get caught out. The Royal Borough contains 966 listed buildings — not clustered in one area, but spread across postcodes like SL4, SL6, SL5 and beyond. If your property is listed, or even close to one, the rules that apply to your neighbour down the road may not apply to you at all.
Green Belt designations add another layer entirely. Parts of the borough sit within Green Belt land, where permitted development assumptions can fall apart fast. Conservation areas introduce their own set of restrictions that aren't obvious from the address alone. Article 4 directions can strip back rights you assumed you had.
Don't assume your neighbour's extension sets a precedent
What was approved on your street isn't a guarantee for your property. Listed building status, Green Belt boundaries, and conservation area edges don't follow neat lines.
The honest answer to "will my project need planning permission?" in Windsor and Maidenhead is almost always: it depends on your property specifically. Not your street. Not your postcode. Yours.
What you really need to know before spending anything
The best way to avoid wasted spend isn't to read more guidance — it's to understand what's actually been approved and refused for projects like yours, on streets like yours, in this borough. That's the intelligence that changes how you approach a project.
WhatCanIBuild pulls together the things that actually predict your outcome: nearby decision patterns, what similar projects got refused and why, and how your property's specific combination of constraints affects your chances. Not generic rules — your address, your project, your risk.
Most homeowners don't realise there's a meaningful difference between knowing you're near a listed building and knowing what that actually means for your specific extension, loft conversion, or outbuilding. One of those is a fact. The other is the answer you need before committing to professional fees.
WhatCanIBuild gives you a property-level picture — approval patterns, constraint combinations, and what's really been happening in Windsor and Maidenhead — before you spend a penny on applications or architects.
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