Updated October 2026 · Fraser Bond
Barnet
Green Belt, garden suburbs and busy town centres all shape Barnet decisions
Green Beltlarge areas
HGSextra Trust consent
8 wkshouseholder target
LDCfor PD certainty
In short: In Barnet, applications go in through the national Planning Portal and appear on the council's planning register. Watch out for borough-specific constraints: large areas of Green Belt, conservation areas such as Mill Hill, Totteridge and Monken Hadley, and Hampstead Garden Suburb, where the Hampstead Garden Suburb Trust's consent is needed for many changes in addition to planning.
| Location | Extra things to check |
|---|---|
| Hampstead Garden Suburb | Trust consent under its scheme of management, plus planning and Article 4 controls |
| Green Belt (e.g. Totteridge, Arkley) | Very restrictive on new buildings and extensions |
| Conservation areas | Stricter rules on extensions, windows and trees |
| Town centres (e.g. Finchley, Edgware, Colindale) | Density and design policies for flats and mixed use |
Is your Barnet extension worth it?
Build cost–
Total project cost–
Potential value added–
Gain (value added minus cost)–
Rough guide only. Value uplift depends on quality, layout and the local ceiling price. Ask us for a valuation.
From idea to decision
1
Check constraintsGreen Belt, conservation area, Hampstead Garden Suburb or Article 4.
2
Pre-application adviceUseful for anything beyond a simple extension.
3
SubmitPlanning Portal with drawings and fee.
4
ConsultationNeighbours and consultees comment.
5
DecisionTarget of 8 weeks for most householder schemes.
Frequently asked questions
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Development advice
Ask us about end values and letting new homes.
Get startedAsk us about end values and letting new homes.
Do I need the Hampstead Garden Suburb Trust's consent?
For many external changes in the Suburb, yes, in addition to planning permission.
Can I extend in the Green Belt?
Extensions must be proportionate to the original building; larger ones are usually refused.
How do I search Barnet planning applications?
Use the council's online planning register by address or reference.
Planning works in Barnet?
Talk to us about value and feasibility first.
Speak to our teamGet a valuation
