How much does planning permission really cost in Barnet?

Most Barnet homeowners assume planning permission costs £548. That's the householder application fee — and it's accurate as far as it goes. But it's a bit like quoting the cost of a car and forgetting insurance, fuel, and parking. Until you see what your specific property's planning picture actually looks like — free, in about a minute, the headline fee tells you very little.

The fee is just the entry ticket

The £548 covers the council's processing of a standard householder application. It does not cover the documents you may be required to submit alongside it. Depending on your property and what you're proposing, you could need a heritage statement, a design and access statement, an arboricultural report, or a flood risk assessment. Each of these costs money — and whether you need them depends entirely on your address.

Barnet's northern fringe sits against significant Green Belt around Totteridge and Arkley. Properties near Mill Hill, Monken Hadley, or Totteridge Village are in conservation areas with their own design sensitivities. None of this is reflected in the £548.

Hampstead Garden Suburb is a category of its own

If your postcode falls within or near Hampstead Garden Suburb — parts of N2 and NW11 — the costs can look very different. The 1907 planned community operates under the oversight of its own Trust, alongside Barnet Council's planning powers. That means two sets of controls, stricter design expectations, and a much higher likelihood that you'll need specialist architectural input before you even submit.

Most homeowners don't realise that permitted development rights — the rules that let you build certain things without applying at all — can be removed by Article 4 Directions. Barnet has Article 4 Directions covering parts of Hampstead Garden Suburb and other heritage streets. If your property sits in one of those areas, work that would normally be free to proceed suddenly requires a full application. The best way to know whether that applies to your address is to check how Article 4 constraints interact with your specific project type.

The hidden cost of getting it wrong

A refused application means you've spent £548 and waited up to eight weeks for a no. You can resubmit — but that's another fee, another wait, and potentially more professional costs. Pre-application advice from Barnet Council is available but charged separately, and there's no guarantee it changes the outcome.

The properties that tend to face refusal aren't random. They cluster around specific constraint combinations — conservation area plus Article 4, or Green Belt adjacency plus flood zone. Knowing the fee is easy. Knowing your odds for your specific project on your specific street is a different question entirely.

WhatCanIBuild pulls together what's actually been approved and refused near your address — so you can see the approval record for your street and what that means for your chances, no signup needed.