Back-of-house extension drawings for Acomb homes — the glazed kitchen-diner across the rear, drawn to City of York Council's depth and daylight limits, delivered in days and revised free until your decision, with a free approval-odds check first.
City of York Council granted 90% of the householder planning decisions it made in its latest published year — 3 points above the 87% England-wide householder average. The historic village green and building line in the conservation area constrain frontage changes and infill near Acomb Green, which is where a policy-literate drawing pack earns its keep. Its dominant Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
Class A and Class B set the thresholds — a rear dormer to 40m³ on a terrace or 50m³ on a semi or detached, and a single-storey rear extension to 3m on a terrace or 4m on a detached house — beyond which City of York Council needs a full application. Acomb carries at least one Article 4 direction, and conservation areas including Acomb, St Paul's Square / Holgate Road and Upper Poppleton remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Acomb is determined against an 8-week statutory target.
Acomb Village (historic cottages and church around the green in the conservation area), Front Street (the suburb's traditional shopping street with flats over shops), Chapelfields (postwar semi-detached suburban housing to the west), Westfield (interwar and postwar estate housing on generous plots) and Hob Moor (housing edging the protected Hob Moor common land) — these are the Acomb pockets our drawings cover most. Heritage designations here include Acomb, St Paul's Square / Holgate Road and Upper Poppleton. City of York Council weighs each proposal against the City of York Local Plan (adopted 2024) and the Acomb conservation area appraisal, where generous interwar plots make rear and side extensions viable, but officers guard the spacing and building lines of paired semis. On roofs the borough is pitched and pantiled roofs on the village core and hipped roofs on the interwar semis, over historic village-core cottages around Acomb Green, interwar and postwar semi-detached houses and Edwardian terraces linking Acomb to Holgate.
The rear extension is the workhorse of Acomb home improvement — it is how a dark back kitchen becomes an open family room facing the garden. Because the borough is built largely from historic village-core cottages around Acomb Green, interwar and postwar semi-detached houses and Edwardian terraces linking Acomb to Holgate, most back walls sit close to a neighbour on at least one side, and that proximity, not the design, is what City of York Council scrutinises. The council reads the proposal against the City of York Local Plan (adopted 2024) and the Acomb conservation area appraisal, and the first line an officer draws is the 45-degree splay from the neighbour's nearest window.
So the drawings live or die on geometry. We set the depth against the exact permitted-development figure, hold the eaves and the flat-roof or lantern build-up under the 4-metre height ceiling, and show the projection tested against both the 45-degree plan angle and the 25-degree section angle to the neighbouring windows. The historic village green and building line in the conservation area constrain frontage changes and infill near Acomb Green, so the rear elevation is composed around it rather than corrected after an objection.
Where the property sits in a conservation area — Acomb, St Paul's Square / Holgate Road and Upper Poppleton among Acomb's — the larger-home extension route is switched off and even a modest rear addition needs consent. The Acomb conservation area protects the historic village green and church, and York's citywide Article 4 direction requires planning permission for any change of use to an HMO across the wider suburb. We confirm the designation before the survey.
Many single-storey rear extensions in Acomb are permitted development and need no application. You will normally need to apply to City of York Council, or use the larger-home prior-approval route, if any of these apply:
We draw the depth, the roof build-up and the daylight splays to each neighbour on the page — the tests City of York Council's officers apply first — and submit a validation-complete pack, whether that is a lawful development certificate, a larger-home prior-approval notice or a full householder application.
Below is City of York Council's real householder decision record, taken from official planning statistics and refreshed as new data lands. City of York grants the large majority of householder applications in Acomb, with the historic village-green conservation area the tightest constraint and the suburban semi stock otherwise offering good extension potential. Rear extensions turn most often on neighbour daylight and depth, so a drawing pack that proves those tests upfront is decided faster and refused less often than a DIY submission.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Across Acomb Village, Front Street and Chapelfields, the approved rear extension is typically a single-storey glazed box within the depth limit, roofed either flat with a lantern or in a shallow mono-pitch, and finished in brick or render to match the host wall. On the borough's historic village-core cottages around acomb green, keeping the projection to the permitted-development figure often avoids an application entirely; where owners want the full 6 metres, the larger-home route succeeds when the neighbour-consultation period passes without a sustained objection.
Generous interwar plots make rear and side extensions viable, but officers guard the spacing and building lines of paired semis. We keep the extension inside the daylight splays, set any glazed roof below the first-floor cill, and retain the garden depth City of York Council expects — so the back elevation answers the amenity case before a neighbour can lodge one. Two-storey rear extensions we draw with the 7-metre boundary gap and privacy screening resolved on the plan.
We draw rear extensions on every street in the borough. A few of the neighbourhoods where Acomb back-of-house projects come up most often:
Rear extension drawings for Acomb Village's historic cottages and church around the green in the conservation area — depth-checked, daylight-tested and drawn to City of York Council's guidance.
Rear extension drawings for Front Street's the suburb's traditional shopping street with flats over shops — depth-checked, daylight-tested and drawn to City of York Council's guidance.
Rear extension drawings for Chapelfields's postwar semi-detached suburban housing to the west — depth-checked, daylight-tested and drawn to City of York Council's guidance.
Rear extension drawings for Westfield's interwar and postwar estate housing on generous plots — depth-checked, daylight-tested and drawn to City of York Council's guidance.
Rear extension drawings for Hob Moor's housing edging the protected Hob Moor common land — depth-checked, daylight-tested and drawn to City of York Council's guidance.
How far you can extend at the back in Acomb depends on your house type and the route you take. This is how the options compare.
| Route | Depth allowed | Consent needed | What City of York Council checks |
|---|---|---|---|
| Standard permitted development | 3m terrace/semi · 4m detached | Lawful development certificate (optional) | Depth, 4m height, materials |
| Larger-home prior approval | 6m terrace/semi · 8m detached | Prior-approval notice + neighbour consultation | Neighbour objections on amenity |
| Full householder application | Beyond the above, or two-storey | Full planning permission | Daylight (45°/25°), bulk, garden retained |
| Conservation area | Case by case | Full planning permission | Character, roof form, boundary treatment |
The larger-home route is switched off on designated land — conservation areas such as Acomb and St Paul's Square / Holgate Road and Article 4 streets need a full application.
A fixed process built around how City of York Council validates and decides rear-extension applications — most drawings are submission-ready within seven days of survey.
Send us your Acomb postcode and house type. We confirm your conservation and Article 4 status, how much rear-extension depth you have under permitted development, and score your odds against live City of York Council decisions.
We measure the original rear wall, floor and eaves levels, side and rear boundary distances and the neighbours' window positions — the numbers the depth limit and daylight splays depend on.
Chartered designers develop the single or two-storey rear extension to your brief, drawn inside the permitted-development limits or to City of York Council's extension design guidance, with the daylight angles shown.
We submit the certificate, prior-approval notice or application, handle validation and case-officer queries, and revise the drawings free until City of York Council issues its decision.
Often not. A single-storey rear extension up to 3 metres deep on a terrace or semi, or 4 metres on a detached house, and no higher than 4 metres, is usually permitted development in Acomb. You will need to involve City of York Council for anything deeper via the larger-home route, for two-storey rear extensions, and for any rear extension in a conservation area such as Acomb and St Paul's Square / Holgate Road, where those permitted-development rights fall away.
The larger-home extension scheme lets a single-storey rear extension reach 6 metres on a terrace or semi, or 8 metres on a detached house — double the standard allowance. It is not automatic: you submit a prior-approval notification to City of York Council, neighbours are consulted, and if one objects on amenity grounds the council rules on it. It also does not apply on designated land such as Acomb's conservation areas.
It is the daylight test City of York Council applies to protect neighbours. Drawn on plan, a line at 45 degrees from the midpoint of the neighbour's nearest ground-floor window should not be crossed by your extension; a companion 25-degree line is checked in section. If the projection breaches it, the extension is likely to be shortened or refused, so we test and prove it on the drawings before submission. This applies to your Acomb address specifically.
A two-storey rear extension almost always needs a full householder application to City of York Council, as it sits outside permitted development on most homes. The council checks that it stays at least 7 metres from the rear boundary, does not overbear the neighbours and avoids new overlooking. We resolve the boundary gap, privacy and daylight on the plans so the application is decided on its merits. This applies to your Acomb address specifically.
Frequently, yes. If the rear extension involves work to a shared wall, building up to the boundary, or excavating foundations near a neighbour's structure, the Party Wall etc. Act applies and you must serve notice — this is separate from City of York Council's planning decision. We flag it early and can prepare the drawings a party-wall surveyor needs alongside the planning set. This applies to your Acomb address specifically.
We price each Acomb rear extension on its own footprint and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until City of York Council approves, and we confirm at the outset whether your extension is permitted development, needs prior approval, or a full application. Call 020 7864 7245 to begin.
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Same fixed quotes, same fast drawings — wherever your project is.