Forty Hill and Winchmore Hill: Enfield heritage controls
Enfield has designated 22 conservation areas, and beyond their boundaries the borough logged 1,810 certificates of lawful development in three years: work carried out with no permission because none was required. What designation removes, what a Heritage Statement must prove, and which alterations survive it.
The national register records 24 covering about 845 hectares, all of them dated, the earliest from 1968. Enfield also holds 33 Article 4 areas. Inside a conservation area Class A side extensions, cladding and Class B roof enlargement are removed outright.
Measure
Enfield
London
Conservation areas in the register
24
1,141
Area covered
845 hectares
—
Earliest designation on the register
1968
—
Article 4 areas in the register
33
—
Householder approval rate
77.8%
83.0%
Applications with an agreed extension of time
6.7%
34.5%
Lawful development certificates issued
1,810
—
Sources: registers from the MHCLG Planning Data Platform, retrieved 1 September 2026, excluding revoked and superseded entries, with hectares computed from the published boundaries; decision figures from MHCLG PS1 and PS2, twelve quarters to March 2026. Enfield’s 6.7% extension-of-time rate is the lowest in London, so a designated-area scheme that cannot be determined as submitted is more likely to be refused than renegotiated.
When were Enfield’s conservation areas designated, and where do they lie?
Enfield is one of the better-recorded boroughs in this series, and the map can show more here than in most places. Both layers are drawn: the conservation areas and, separately, the Article 4 direction areas, each as filed to the national register. Type a postcode and the comparison happens in the page, with no request sent anywhere. Edges are the weak point everywhere, this borough included — the stored shapes are precise enough to find an area and not precise enough to adjudicate a plot that sits half in and half out.
Every conservation area Enfield has filed carries a designation date, and every one of them carries a council document, which puts the borough in a small minority of the thirty-three. The dates run from 1968 to 2010; the register gives them to the year rather than to the day, so read them as years and not as anniversaries. That span is itself the useful fact. Designation here did not stop with the first wave that followed the 1967 Act, and the newest boundary on this map is barely fifteen years old, which is worth knowing if you are working from an assumption formed a decade ago. The designated land totals 845 hectares, and Trent Park takes 389.5 of them, so much of the largest shape on screen is estate landscape rather than residential grain. Abbotshall Avenue, at half a hectare, is the other extreme. Then there is the second layer: 33 Article 4 direction areas are on the register for Enfield, which is more than the borough has conservation areas. Each removes a particular permitted development right inside its own outline, they do not follow the conservation boundaries, and an address with no designation at all can still be inside one.
Dates, hectares and both mapped layers are taken from two registers published at planning.data.gov.uk, conservation-area and article-4-direction-area; the download was made on 15 August 2026 and re-read on 1 September 2026. Contains public sector information licensed under the Open Government Licence v3.0
In detail
Answers for Enfield
How many conservation areas does Enfield have?
Enfield has 22 designated conservation areas, including Forty Hill, Enfield Town, Gentleman's Row, Winchmore Hill, Bush Hill Park.
What changes need planning in a Enfield conservation area?
Any external alteration visible from a public space typically requires full planning permission inside a conservation area: roof additions, dormers, replacement windows, rendering, hardstanding, and demolition. Internal works generally do not, unless the property is also listed.
Do I need a Heritage Statement in Enfield?
Yes. No Enfield conservation-area application goes in without one. What it has to do is take the council's published character appraisal for your area — Forty Hill's, Winchmore Hill Green's — and answer it point by point: where the group's significance actually lies, what your proposal touches, and why what results preserves or improves it. Assertion carries no weight here. The officer is looking for the appraisal's own terms coming back with evidence attached. We prepare it as part of the application itself.
Can I have a roof extension or mansard in a Enfield conservation area?
A rear mansard or rear dormer is winnable inside an Enfield conservation area where the roof it joins already carries that form and the materials match. What sinks these schemes is visibility from the front: a dormer on a principal slope facing the street gets refused as a matter of routine, designated or not. Enfield's stock makes the point concrete — 28.3% of its 128,340 dwellings went up in the 1930s, in long uniform runs where a single altered roof reads instantly against the twenty beside it.
How long does conservation area approval take in Enfield?
Eight weeks is the period Enfield Council works to on householder cases, and it met it on 2,486 of the 2,731 measured against the clock, or 91.0%. Conservation-area cases run slower than that average because the conservation officer's consultation sits on top, usually two to three weeks of it. What sets Enfield apart is how rarely it asks for longer. Only 367 of its 5,493 decisions ran on an agreed extension, near enough 7%, while the 33 boroughs pooled reach 34.5%. Budget 11 to 14 weeks between validation and a decision notice, and read the statutory determination date as where the conversation opens, not where it ends.
Planning application setExisting, proposed and location plans on one sheet — as the council receives it through the Planning Portal.
Long sectionHead height over the stair, dormer geometry and ridge height resolved to scale.
The planning set that goes to the council through the Planning Portal: proposed elevations, plans, and the OS location plan with your site outlined.
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Which postcode districts around Enfield do we cover for conservation area application work?
Every Enfield district on our drawing board, the period of housing that fills it, and the authority an application from that address goes to. Whatever fee the table shows is a statutory 2026 charge fixed by government for England, not a price we have put on the job.
Postcode
Area
Dominant stock
What it means for a conservation area application
N14
Southgate
1930s semi-detached, Edwardian villas
Southgate is entirely N14 and entirely Enfield's, so one set of Local Plan policies and one designation map cover every address in the district.
N18
Upper Edmonton
Victorian terraces, post-war estates
Upper Edmonton is N18 throughout and Enfield's throughout, so the borough validates and its own designation map governs.
N21
Winchmore Hill
Edwardian villas, 1930s semi-detached
Winchmore Hill lies entirely within N21, and Enfield validates whatever is submitted from that district without any second authority to consult.
EN1
Enfield Town / Bush Hill Park
Georgian fragments, 1930s semi-detached
Enfield Town and Bush Hill Park share EN1, wholly inside the borough, with Enfield's Local Plan policies applying across it.
EN2
Enfield / Forty Hill
Georgian fragments, 1930s semi-detached
EN2 takes in Enfield and Forty Hill: one authority, one designation map.
EN3
Ponders End / Brimsdown
Post-war estates, Victorian terraces
Ponders End and Brimsdown occupy EN3, again wholly Enfield's, with no neighbouring authority involved in validating anything drawn for that district.
N11
New Southgate / Bounds Green
Edwardian villas in Palmers Green and Winchmore Hill; 1930s semi-detached in Southgate; Victorian terraces in Edmonton; Metropolitan Green Belt north of the borough
N11 is shared ground. A New Southgate or Bounds Green address belongs to Barnet or to Enfield depending on where the boundary runs past it, so that gets settled before anything is submitted.
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
EN4 crosses the boundary around East Barnet and Cockfosters; establish whether Barnet or Enfield validates before an EN4 drawing set is prepared.
Which Enfield neighbourhoods suit a conservation area application best?
Set a 1930s Southgate semi beside an Edwardian villa in Winchmore Hill and almost nothing matches: not the pitch of the roof, not the make-up of the walls, not the depth of garden behind. Those three things decide what a conservation-area scheme can actually achieve at a given Enfield address.
Bush Hill Park (EN1) — a conservation area application in Bush Hill Park starts from edwardian villas, and Bush Hill Park reads as Edwardian conservation area. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed in EN1. Enfield Council assesses Bush Hill Park conservation area applications against its own Bush Hill Park character guidance, and the location plan we draw for Bush Hill Park references Bush Hill Park station.
Oakwood (N14) — a conservation area application in Oakwood starts from 1930s semi-detached, and Oakwood reads as 1930s semi-detached. On these 1930s semis the prior approval route often replaces a full application in N14. Enfield Council assesses Oakwood conservation area applications against its own Oakwood character guidance, and the location plan we draw for Oakwood references Oakwood Tube.
Enfield Town (EN1, EN2) — Georgian centre, 1930s residential ring defines Enfield Town, where georgian fragments, 1930s semi-detached set what a conservation area application can do. Applications on Georgian stock here almost always need a heritage statement alongside the drawings across EN1. Any Enfield Town conservation area application is validated by Enfield Council, with Enfield Market the usual Enfield Town reference point on the site plan.
Palmers Green (N13) — a conservation area application in Palmers Green starts from edwardian villas, 1930s semi-detached, and Palmers Green reads as Edwardian villas. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed in N13. Enfield Council assesses Palmers Green conservation area applications against its own Palmers Green character guidance, and the location plan we draw for Palmers Green references Palmers Green station.
Winchmore Hill (N21) — conservation area application work in Winchmore Hill means edwardian villas, 1930s semi-detached. Winchmore Hill is Edwardian villas, conservation. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed throughout N21. Enfield Council decides the Winchmore Hill application, and Winchmore Hill Green anchors the Winchmore Hill location plan.
Southgate (N14) — 1930s semi-detached, Edwardian defines Southgate, where 1930s semi-detached, edwardian villas set what a conservation area application can do. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed across N14. Any Southgate conservation area application is validated by Enfield Council, with Southgate Tube the usual Southgate reference point on the site plan.
Edmonton (N9, N18) — conservation area application work in Edmonton means victorian terraces, post-war estates. Edmonton is Victorian terraces, post-war estates. Most applications on these Victorian streets are householder applications validated on existing and proposed plans throughout N9. Enfield Council decides the Edmonton application, and Edmonton Green anchors the Edmonton location plan.
What local planning policy applies to a conservation area application in Enfield?
Conservation areas covering Enfield: Enfield Council runs 22, and Forty Hill, Enfield Town, Gentleman's Row are the ones Enfield owners meet most. A conservation area application inside a Enfield conservation area loses permitted development, so the Enfield submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Forty Hill a conservation area application is judged on the street elevation first.
Article 4 in Enfield: no borough-wide direction has ever been made here, which leaves permitted development largely intact once you are beyond the 22 designations and away from anything listed. That is the practical reason behind 1,810 Lawful Development Certificates recorded in three years. A certificate costs £274 and is how an N9 owner puts it on record that the work was lawful without any permission being needed. No grant rate exists for these in the national statistics, for Enfield or for any English authority, so read 1,810 as a volume and nothing more.
The building fabric around Enfield: 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 conservation area application in Enfield is scoped against that stock first.
What happens if a Enfield property sits on a boundary?
Barnet — the Barnet boundary runs against Enfield, so a conservation area application a street from Enfield is decided by Barnet Council instead. Barnet runs 20 conservation areas across N2 and its neighbours, which is why conservation area applications priced for Enfield are re-checked against Barnet policy whenever the Enfield address sits on that edge.
Haringey — cross the Enfield boundary and Haringey Council takes the conservation area application instead, applying 29 conservation areas of its own around N4. We re-price conservation area applications at the Enfield edge because Haringey policy and Enfield policy rarely align on conservation area application depth.
Waltham Forest — adjoining Enfield, with 17 conservation areas centred on E4. A conservation area application on the far side of the Enfield line is determined by Waltham Forest Council, so the Enfield quote for conservation area applications is checked against Waltham Forest guidance before it is issued.
Sources for this Enfield conservation area application 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.
A london terraced street of the type we survey — conservation area planning in Enfield.
