Side-return infill drawings for North Downs West terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to Folkestone and Hythe Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Folkestone and Hythe Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. North Downs West contains Etchinghill, Postling conservation areas (Etchinghill designated 1973), 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.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. In conservation areas such as Etchinghill and Postling those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in North Downs West is determined against an 8-week statutory target.
Etchinghill (conservation area designated in 1973), Postling (conservation area designated in 1973), Elmsted (civil parish within North Downs West), Lyminge (civil parish within North Downs West), Monks Horton (civil parish within North Downs West), Postling (civil parish within North Downs West), Sellindge (civil parish within North Downs West) and Stanford (civil parish within North Downs West) — these are the North Downs West pockets our drawings cover most. Heritage designations here include Etchinghill and Postling. Folkestone and Hythe Council weighs each proposal against Folkestone and Hythe Council's development plan and the design policies it applies to householder applications, where the 2,290 homes here are 18% pre-1900, 17% 1965-1972, 9% 1955-1964, 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-pitched roofs and integral garages typical of that period's building, over Victorian and earlier houses (18% of 2,290 homes), late-1960s and early-1970s houses (17%) and late-1950s and early-1960s houses (9%).
What is permitted in North Downs West turns on designation first, so that is where we start: Etchinghill (conservation area designated in 1973) and Postling (conservation area designated in 1973). Inside those boundaries permitted development is curtailed and Folkestone and Hythe 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, North Downs West takes in Elmsted, Lyminge, Monks Horton, Postling, Sellindge and Stanford. No Article 4 direction is recorded for Folkestone and Hythe Council, but North Downs West's 2 conservation areas still limit permitted development on those streets.
On stock, North Downs West is Victorian and earlier houses (18% of 2,290 homes), late-1960s and early-1970s houses (17%) and late-1950s and early-1960s houses (9%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow-pitched roofs and integral garages typical of that period's building govern what a loft or rear projection can realistically be. Folkestone and Hythe Council decided 345 householder applications in the latest published year and granted 88%, with 96% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for North Downs West runs pre-1900 18% (410 homes), 1900-1918 4% (90 homes), 1919-1929 3% (60 homes), 1930-1939 4% (90 homes), 1945-1954 4% (100 homes), 1955-1964 9% (200 homes), 1965-1972 17% (390 homes), 1973-1982 5% (120 homes), 1983-1992 6% (130 homes), 1993-1999 4% (100 homes) and 2000-2008 6% (140 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.
Folkestone and Hythe Council also decides for Hythe, Hythe Rural, New Romney, North Downs East, Romney Marsh and Walland & Denge Marsh, so a decision in North Downs West 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 North Downs West and Folkestone and Hythe Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | North Downs West |
|---|---|
| Dwellings recorded | 2,290 |
| Built pre-1900 | 410 (18%) |
| Built 1900-1918 | 90 (4%) |
| Built 1919-1929 | 60 (3%) |
| Built 1930-1939 | 90 (4%) |
| Built 1945-1954 | 100 (4%) |
| Built 1955-1964 | 200 (9%) |
| Built 1965-1972 | 390 (17%) |
| Built 1973-1982 | 120 (5%) |
| Built 1983-1992 | 130 (6%) |
| Built 1993-1999 | 100 (4%) |
| Built 2000-2008 | 140 (6%) |
| Built before 1919 | 22% |
| Built 1919–1939 | 7% |
| Built 1945–2008 | 52% |
| Conservation areas in North Downs West | 2 (Etchinghill, Postling) |
| Conservation areas district-wide | 21 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 345 |
| Householder applications granted | 88% |
| Decided within 8 weeks | 96% |
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 Folkestone and Hythe Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The side return is the classic terrace fix, and North Downs West has the stock for it — the borough is built largely from Victorian and earlier houses (18% of 2,290 homes), late-1960s and early-1970s houses (17%) and late-1950s and early-1960s houses (9%), 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. Folkestone and Hythe Council judges the infill against Folkestone and Hythe Council's development plan and the design policies it applies to householder applications, 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. North Downs West contains Etchinghill, Postling conservation areas (Etchinghill designated 1973), 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 North Downs West's terraces sit in conservation areas — Etchinghill and Postling among them — where a side extension is no longer permitted development. No Article 4 direction is recorded for Folkestone and Hythe Council, but North Downs West's 2 conservation areas still limit permitted development on those streets. We confirm the designation before a line is drawn.
Some single-storey side returns in North Downs West 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 Folkestone and Hythe 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 Folkestone and Hythe 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 Folkestone and Hythe Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Folkestone and Hythe Council granted 88% of its householder applications in the year to 31 March 2026, and Etchinghill shapes what is approved here. 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 Etchinghill, Postling and Elmsted, 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 (18% of 2,290 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 2,290 homes here are 18% pre-1900, 17% 1965-1972, 9% 1955-1964, 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 Folkestone and Hythe 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 North Downs West side returns come up most often:
Side return extension drawings for Etchinghill's conservation area designated in 1973 — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Postling's conservation area designated in 1973 — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Elmsted's civil parish within North Downs West — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Lyminge's civil parish within North Downs West — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Monks Horton's civil parish within North Downs West — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Postling's civil parish within North Downs West — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Whether a side return in North Downs West 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 Folkestone and Hythe 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 Etchinghill and Postling, side extensions are not permitted development and always need a full application.
A fixed process built around how Folkestone and Hythe Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your North Downs West 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 Folkestone and Hythe 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 Folkestone and Hythe 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 Folkestone and Hythe 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 North Downs West you will need a full application to Folkestone and Hythe Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Etchinghill and Postling, 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. North Downs West's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. Folkestone and Hythe 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 Folkestone and Hythe 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 North Downs West 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 Folkestone and Hythe 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 North Downs West address specifically.
A householder planning application in North Downs West 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. Folkestone and Hythe Council is the decision-maker.
We price each North Downs West 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 Folkestone and Hythe 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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