Side-return infill drawings for Arun terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to Arun District Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Arun District Council granted 94% of the householder planning decisions it made in its latest published year — 7 points above the 87% England-wide householder average. Arun contains Aldingbourne Church Road, Angmering, Barnham (Church Lane) conservation areas (Aldingbourne Church Road designated 1998), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901) 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 Arun District Council needs a full application. In conservation areas such as Aldingbourne Church Road, Angmering and Barnham (Church Lane) those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Arun is determined against an 8-week statutory target.
Aldingbourne Church Road (conservation area designated in 1998), Angmering (designated conservation area), Barnham (Church Lane) (conservation area designated in 1998), Bognor Regis (Aldwick Road) (conservation area designated in 1994), Bognor Regis (Railway Station) (conservation area designated in 1994), Bognor Regis (The Steyne and Waterloo Square) (conservation area designated in 1994), Bognor Regis (Upper Bognor Road and Mead Lane) (conservation area designated in 1993), East Preston Station Road (conservation area designated in 1994), Angmering & Findon (ward of Arun), Arundel & Walberton (ward of Arun), Barnham (ward of Arun), Beach (ward of Arun), Bersted (ward of Arun), East Preston (ward of Arun), Hotham (ward of Arun) and Marine (ward of Arun) — these are the Arun pockets our drawings cover most. Heritage designations here include Aldingbourne Church Road, Angmering, Barnham (Church Lane), Bognor Regis (Aldwick Road), Bognor Regis (Railway Station), Bognor Regis (The Steyne and Waterloo Square), Bognor Regis (Upper Bognor Road and Mead Lane) and East Preston Station Road. Arun District Council weighs each proposal against Arun District Council's adopted local plan and its householder design guidance, where the 43,470 homes here are 9% pre-1900, 8% 1955-1964, 7% 1973-1982, which is what sets the realistic roof and rear-projection options. On roofs the borough is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow gabled roofs typical of that period's building, over Victorian and earlier houses (9% of 43,470 homes), late-1950s and early-1960s houses (8%) and 1970s and early-1980s houses (7%).
Heritage designation is the single biggest variable in Arun, and it is address-specific: Aldingbourne Church Road (conservation area designated in 1998), Angmering (designated conservation area), Barnham (Church Lane) (conservation area designated in 1998), Bognor Regis (Aldwick Road) (conservation area designated in 1994), Bognor Regis (Railway Station) (conservation area designated in 1994), Bognor Regis (The Steyne and Waterloo Square) (conservation area designated in 1994), Bognor Regis (Upper Bognor Road and Mead Lane) (conservation area designated in 1993) and East Preston Station Road (conservation area designated in 1994). Inside those boundaries permitted development is curtailed and Arun District Council assesses materials, window detail and roof form against the area's own appraisal, so a scheme that would be waved through two streets away can need a full application here.
Beyond the designated areas, Arun takes in Angmering & Findon, Arundel & Walberton, Barnham, Beach, Bersted, East Preston, Hotham and Marine. No Article 4 direction is recorded for Arun District Council, but the district's 8 conservation areas still limit permitted development on those streets.
On stock, Arun is Victorian and earlier houses (9% of 43,470 homes), late-1950s and early-1960s houses (8%) and 1970s and early-1980s houses (7%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow gabled roofs typical of that period's building govern what a loft or rear projection can realistically be. Arun District Council decided 453 householder applications in the latest published year and granted 94%, with 99% issued inside the eight-week target. We work from the council's own published record.
The full build-period split for Arun runs pre-1900 3% (190 homes), 1900-1918 0% (30 homes), 1919-1929 0% (10 homes), 1930-1939 6% (350 homes), 1945-1954 3% (170 homes), 1955-1964 30% (1,850 homes), 1965-1972 33% (1,990 homes), 1973-1982 4% (260 homes), 1983-1992 5% (310 homes), 1993-1999 4% (220 homes) and 2000-2008 3% (170 homes). That distribution is why pre-1900 detailing dominates the drawings here, and it is measured from council-tax records rather than assumed from the street name.
Arun District Council also decides for Angmering & Findon, Arundel & Walberton, Barnham, Beach, Bersted, East Preston, Hotham and Marine, so a decision in Arun sits inside a wider pattern of decisions we track across the same authority — useful when an officer cites a precedent from the next area over.
Published figures for Arun and Arun District Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Arun |
|---|---|
| Dwellings recorded | 43,470 |
| Built pre-1900 | 190 (3%) |
| Built 1900-1918 | 30 (0%) |
| Built 1919-1929 | 10 (0%) |
| Built 1930-1939 | 350 (6%) |
| Built 1945-1954 | 170 (3%) |
| Built 1955-1964 | 1,850 (30%) |
| Built 1965-1972 | 1,990 (33%) |
| Built 1973-1982 | 260 (4%) |
| Built 1983-1992 | 310 (5%) |
| Built 1993-1999 | 220 (4%) |
| Built 2000-2008 | 170 (3%) |
| Built before 1919 | 18% |
| Built 1919–1939 | 12% |
| Built 1945–2008 | 55% |
| Conservation areas in Arun | 8 (Aldingbourne Church Road, Angmering…) |
| Conservation areas district-wide | 23 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 453 |
| Householder applications granted | 94% |
| Decided within 8 weeks | 99% |
Dwelling stock from VOA council-tax data at 31 March 2025; conservation-area and Article 4 counts from planning.data.gov.uk (MHCLG); decision figures are Arun District Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The side return is the classic terrace fix, and Arun has the stock for it — the borough is built largely from Victorian and earlier houses (9% of 43,470 homes), late-1950s and early-1960s houses (8%) and 1970s and early-1980s houses (7%), 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. Arun District Council judges the infill against Arun District Council's adopted local plan and its householder design guidance, 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. Arun contains Aldingbourne Church Road, Angmering, Barnham (Church Lane) conservation areas (Aldingbourne Church Road designated 1998), so materials, fenestration and roof form are assessed against the appraisal, so we resolve it on the section rather than leave it to the case officer.
Many of Arun's terraces sit in conservation areas — Aldingbourne Church Road, Angmering, Barnham (Church Lane), Bognor Regis (Aldwick Road), Bognor Regis (Railway Station), Bognor Regis (The Steyne and Waterloo Square), Bognor Regis (Upper Bognor Road and Mead Lane) and East Preston Station Road among them — where a side extension is no longer permitted development. No Article 4 direction is recorded for Arun District Council, but the district's 8 conservation areas still limit permitted development on those streets. We confirm the designation before a line is drawn.
Some single-storey side returns in Arun 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 Arun District 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 Arun District 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 Arun District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Arun District Council granted 94% of 453 householder decisions in the year to 31 March 2026, 99% of them inside eight weeks. 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 Aldingbourne Church Road, Angmering and Barnham (Church Lane), 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 victorian and earlier houses (9% of 43,470 homes), 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.
The 43,470 homes here are 9% pre-1900, 8% 1955-1964, 7% 1973-1982, which is what sets the realistic roof and rear-projection options. 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 Arun District 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 Arun side returns come up most often:
Side return extension drawings for Aldingbourne Church Road's conservation area designated in 1998 — width-checked, party-wall detailed and drawn to Arun District Council's guidance.
Side return extension drawings for Angmering's designated conservation area — width-checked, party-wall detailed and drawn to Arun District Council's guidance.
Side return extension drawings for Barnham (Church Lane)'s conservation area designated in 1998 — width-checked, party-wall detailed and drawn to Arun District Council's guidance.
Side return extension drawings for Bognor Regis (Aldwick Road)'s conservation area designated in 1994 — width-checked, party-wall detailed and drawn to Arun District Council's guidance.
Side return extension drawings for Bognor Regis (Railway Station)'s conservation area designated in 1994 — width-checked, party-wall detailed and drawn to Arun District Council's guidance.
Side return extension drawings for Bognor Regis (The Steyne and Waterloo Square)'s conservation area designated in 1994 — width-checked, party-wall detailed and drawn to Arun District Council's guidance.
Whether a side return in Arun 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 Arun District 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 Aldingbourne Church Road and Angmering, side extensions are not permitted development and always need a full application.
A fixed process built around how Arun District Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your Arun 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 Arun District 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 Arun District 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 Arun District 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 Arun you will need a full application to Arun District Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Aldingbourne Church Road and Angmering, 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. Arun's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. Arun District 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 Arun District 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.
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 Arun District 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.
A householder planning application in Arun 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. Arun District Council is the decision-maker.
We price each Arun 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 Arun District 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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