East Barnet / Cockfosters — covered by Barnet Council.
Planning permission drawings delivered by an MCIAT chartered team.
Building regulations drawings delivered by an MCIAT chartered team.
Loft conversion drawings delivered by an MCIAT chartered team.
House extension drawings delivered by an MCIAT chartered team.
Mansard roof extensions delivered by an MCIAT chartered team.
Garage conversion drawings delivered by an MCIAT chartered team.
Basement conversion drawings delivered by an MCIAT chartered team.
Structural calculations delivered by an MCIAT chartered team.
Measured building survey delivered by an MCIAT chartered team.
Party wall services delivered by an MCIAT chartered team.
Rear dormer drawings delivered by an MCIAT chartered team.


EN4 primarily covers East Barnet / Cockfosters in Barnet. It also touches Enfield.
Decisions for EN4 are made by Barnet Council. Standard Permitted Development rules apply for most rear extensions and loft conversions on terraced and semi-detached houses, unless the property is in a conservation area, is listed, or sits under an Article 4 Direction. Article 4 in Barnet: No.
Building regs from £950. We do not charge hourly. Free site survey across all EN4 addresses.
From first call to planning decision: typically 12–14 weeks. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination. Barnet Council timelines align with the national norm.
East Barnet / Cockfosters in EN4 is characterised by the housing stock of Barnet — broadly 1930s semi-detached dominates.

Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every EN4 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. EN4 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| EN4 | East Barnet / Cockfosters | mixed Victorian and inter-war stock | EN4 straddles a boundary: East Barnet / Cockfosters addresses fall to Barnet Council or Enfield Council, so confirm which authority validates the drawing package before submitting EN4 drawings. |
| N2 | East Finchley | Edwardian terraces, 1930s semi-detached | Adjoining district to EN4, also inside Barnet for drawing package purposes. |
| N3 | Finchley Central | 1930s semi-detached, Edwardian villas | Adjoining district to EN4, also inside Barnet for drawing package purposes. |
| N11 | New Southgate / Bounds Green | mixed stock | Adjoining district to EN4, also inside Barnet for drawing package purposes. |
| N12 | North Finchley / Woodside Park | 1930s semi-detached, Edwardian villas | Adjoining district to EN4, also inside Barnet for drawing package purposes. |
| N9 | Lower Edmonton | Victorian terraces, post-war estates | Adjoining district to EN4, also inside Enfield for drawing package purposes. |
| N13 | Palmers Green | Edwardian villas, 1930s semi-detached | Adjoining district to EN4, also inside Enfield for drawing package purposes. |
| N14 | Southgate | 1930s semi-detached, Edwardian villas | Adjoining district to EN4, also inside Enfield for drawing package purposes. |
| N18 | Upper Edmonton | Victorian terraces, post-war estates | Adjoining district to EN4, also inside Enfield for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few EN4 streets, and each one changes what a drawing package can achieve at that address.
How designation changes a EN4 (East Barnet / Cockfosters) drawing package: Barnet Council maintains 20 conservation areas, including Hendon, Golders Green, Monken Hadley. Inside any of them a EN4 (East Barnet / Cockfosters) drawing package cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Golders Green sets the tone for EN4 (East Barnet / Cockfosters) casework.
Article 4 and your EN4 (East Barnet / Cockfosters) drawing package: Barnet Council has made no borough-wide direction, so permitted development for a drawing package in EN4 (East Barnet / Cockfosters) generally survives outside EN4 (East Barnet / Cockfosters) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a EN4 owner records that a drawing package was lawful.
The building fabric around EN4 (East Barnet / Cockfosters): 1930s semi-detached dominates; Edwardian villas in Muswell Hill, Finchley; Garden Suburb Arts & Crafts in Hampstead Garden Suburb; post-war flats in Colindale. Suburban outer-London borough; permitted development used heavily; Hampstead Garden Suburb has its own residents' trust with additional design controls. A drawing package in EN4 (East Barnet / Cockfosters) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Barnet Council.
How designation changes a EN4 (East Barnet / Cockfosters) drawing package: Enfield Council maintains 22 conservation areas, including Gentleman's Row, Winchmore Hill, Bush Hill Park. Inside any of them a EN4 (East Barnet / Cockfosters) drawing package cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Winchmore Hill sets the tone for EN4 (East Barnet / Cockfosters) casework.
Article 4 and your EN4 (East Barnet / Cockfosters) drawing package: Enfield Council has made no borough-wide direction, so permitted development for a drawing package in EN4 (East Barnet / Cockfosters) generally survives outside EN4 (East Barnet / Cockfosters) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a EN4 owner records that a drawing package was lawful.
The building fabric around EN4 (East Barnet / Cockfosters): Edwardian villas in Palmers Green and Winchmore Hill; 1930s semi-detached in Southgate; Victorian terraces in Edmonton; Metropolitan Green Belt north of the borough. Outer north London; Metropolitan Green Belt affects north; generally permissive elsewhere. A drawing package in EN4 (East Barnet / Cockfosters) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Enfield Council.
Sources for this EN4 drawing package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
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