Side-return infill drawings for Acomb terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to City of York Council's guidance, 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 side return is the classic terrace fix, and Acomb has the stock for it — 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, and the Victorian and Edwardian versions almost all have an L-shaped back addition with a wasted alley beside it. Fill that alley and the dark galley kitchen becomes a bright, square room the full width of the house. City of York Council judges the infill against the City of York Local Plan (adopted 2024) and the Acomb conservation area appraisal, and because it runs along the party boundary, the neighbour relationship is read before the design.
That boundary is where the drawings earn their keep. We set the infill wall on or up to the line, keep the roof — usually a glazed lantern or a shallow pitch tying into the existing back-addition slope — below the neighbour's first-floor windows, and detail the rainwater and party-wall junction so the build is watertight and the Party Wall Act is satisfied. The historic village green and building line in the conservation area constrain frontage changes and infill near Acomb Green, so we resolve it on the section rather than leave it to the case officer.
Many of Acomb's terraces sit in conservation areas — Acomb, St Paul's Square / Holgate Road and Upper Poppleton among them — where a side extension is no longer permitted development. 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 a line is drawn.
Some single-storey side returns in Acomb are permitted development, but the width and boundary make an application more likely than for a straight rear extension. You will normally need to apply to City of York Council if any of these apply:
We draw the infill wall on the boundary, the glazed roof below the neighbour's windows and the party-wall junction on the page — the details City of York Council's officers and your neighbour both check — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is City of York Council's real householder decision record, drawn 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. Side returns hinge on width, roof glazing and the party boundary, so a pack that resolves those details 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 side return is a single-storey infill roofed with a glazed lantern or roof light to pull daylight deep into the plan, its flank wall built on the boundary and finished to match the host brick. On the borough's historic village-core cottages around acomb green, this is frequently the single biggest gain in usable ground-floor space, and where it stays within the width and height limits it can proceed under permitted development or a lawful development certificate.
Generous interwar plots make rear and side extensions viable, but officers guard the spacing and building lines of paired semis. We keep the glazed roof below the neighbour's cill line, set the gutter and the party-wall flashing so water and maintenance are designed in, and — where owners want the full open-plan room — pair the infill with a rear extension as a single wraparound application. That way City of York Council sees one coherent scheme rather than two overlapping ones.
We draw side-return infills on every terraced street in the borough. A few of the neighbourhoods where Acomb side returns come up most often:
Side return extension drawings for Acomb Village's historic cottages and church around the green in the conservation area — width-checked, party-wall detailed and drawn to City of York Council's guidance.
Side return extension drawings for Front Street's the suburb's traditional shopping street with flats over shops — width-checked, party-wall detailed and drawn to City of York Council's guidance.
Side return extension drawings for Chapelfields's postwar semi-detached suburban housing to the west — width-checked, party-wall detailed and drawn to City of York Council's guidance.
Side return extension drawings for Westfield's interwar and postwar estate housing on generous plots — width-checked, party-wall detailed and drawn to City of York Council's guidance.
Side return extension drawings for Hob Moor's housing edging the protected Hob Moor common land — width-checked, party-wall detailed and drawn to City of York Council's guidance.
Whether a side return in Acomb needs permission comes down to width, storeys and whether the street is designated. This is how the cases compare.
| Side return type | Permitted development? | What it gains | What City of York Council checks |
|---|---|---|---|
| Single-storey infill, within limits | Often yes, if under half the house width | Full-width kitchen-diner | Width, 4m height, roof glazing |
| Single-storey, over half width | No — full application | Wider room, more light | Boundary treatment, neighbour amenity |
| Two-storey side return | No — full application | Room above as well as below | Bulk, overlooking, terrace rhythm |
| Wraparound (side + rear) | No — full application | L-shaped open-plan ground floor | Combined footprint, garden retained |
In conservation areas such as Acomb and St Paul's Square / Holgate Road, side extensions are not permitted development and always need a full application.
A fixed process built around how City of York Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your Acomb postcode and terrace type. We confirm your conservation and Article 4 status, whether the infill stays within the side-extension width limit, and score your odds against live City of York Council decisions.
We measure the side alley, the back-addition wall, floor and eaves levels and the neighbour's window heights — the numbers the width limit, roof pitch and party-wall detailing depend on.
Chartered designers develop the infill and its glazed roof to your brief, drawn inside the permitted-development limits or to City of York Council's extension guidance, with the boundary and party-wall junction detailed.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until City of York Council issues its decision.
Sometimes not. A single-storey side-return infill can be permitted development if it is no wider than half the original house, no higher than 4 metres, and the property is not on designated land. In Acomb you will need a full application to City of York Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Acomb and St Paul's Square / Holgate Road, where those rights are removed.
It is an infill that fills the narrow open alley running alongside the rear back-addition of a Victorian or Edwardian terrace — the strip of ground that is usually too small to use. Building over it squares off the ground floor, so a cramped galley kitchen becomes a full-width room. Acomb's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. City of York Council is the decision-maker.
Almost always. A side return is built on or up to the boundary with your neighbour, so the Party Wall etc. Act applies and you must serve notice before work starts — this is entirely separate from City of York Council's planning decision. We detail the party-wall junction on the drawings and flag the notice early so a surveyor can be appointed without delaying the build. This applies to your Acomb address specifically.
Yes, and it is common — the combined L-shape is a wraparound extension. Once the side infill joins a rear projection beyond the permitted-development depth, the whole thing needs a full householder application to City of York Council rather than qualifying as permitted development. We draw it as one coherent scheme so the council assesses a single footprint, which reads more clearly than two overlapping proposals. This applies to your Acomb address specifically.
A householder planning application in Acomb runs to a statutory eight-week target, and a lawful development certificate to eight weeks as well, though an incomplete pack can stall at validation. Because a side return involves the boundary and roof glazing, a complete, well-detailed submission matters — we prepare it validation-complete and manage officer queries to keep the decision on track. City of York Council is the decision-maker.
We price each Acomb side return individually, because alley width and roof form vary house to house, 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 infill is permitted development or needs an application. Call 020 7864 7245 to start.
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