Side-return infill drawings for North Downs East 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 East contains Elham, Frogholt, Newington conservation areas (Elham designated 1970), 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) housing stock sets the design brief on most streets.
The permitted-development ceilings are fixed: 40m³ of new roof volume for a terraced loft and 50m³ for a semi or detached house under Class B, plus a 3m single-storey rear extension on a terrace or 4m on a detached house under Class A. In conservation areas such as Elham, Frogholt and Newington those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in North Downs East is determined against an 8-week statutory target.
Elham (conservation area designated in 1970), Frogholt (conservation area designated in 1990), Newington (conservation area designated in 1974), Acrise (civil parish within North Downs East), Elham (civil parish within North Downs East), Hawkinge (civil parish within North Downs East), Newington (civil parish within North Downs East), Paddlesworth (civil parish within North Downs East) and Swingfield (civil parish within North Downs East) — these are the North Downs East pockets our drawings cover most. Heritage designations here include Elham, Frogholt and Newington. Folkestone and Hythe Council weighs each proposal against the adopted Folkestone and Hythe local plan and Folkestone and Hythe Council's design guidance for householder work, where the 6,040 homes here are 23% 2000-2008, 15% 1993-1999, 11% pre-1900, which is what sets the realistic roof and rear-projection options. On roofs the borough is trussed-rafter roofs typical of 2000s building and trussed-rafter roofs typical of 1990s building, over 2000s houses and apartments (23% of 6,040 homes), 1990s estate houses (15%) and Victorian and earlier houses (11%).
Before anything is drawn we check your address against the designations that apply in North Downs East: Elham (conservation area designated in 1970), Frogholt (conservation area designated in 1990) and Newington (conservation area designated in 1974). 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 East takes in Acrise, Elham, Hawkinge, Newington, Paddlesworth and Swingfield. No Article 4 direction is recorded for Folkestone and Hythe Council, but North Downs East's 3 conservation areas still limit permitted development on those streets.
On stock, North Downs East is 2000s houses and apartments (23% of 6,040 homes), 1990s estate houses (15%) and Victorian and earlier houses (11%) — which is why trussed-rafter roofs typical of 2000s building and trussed-rafter roofs typical of 1990s 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. That decision record, not a national figure, is what we design to.
The full build-period split for North Downs East runs pre-1900 11% (670 homes), 1900-1918 2% (140 homes), 1919-1929 3% (190 homes), 1930-1939 5% (310 homes), 1945-1954 3% (160 homes), 1955-1964 9% (530 homes), 1965-1972 6% (370 homes), 1973-1982 4% (230 homes), 1983-1992 4% (220 homes), 1993-1999 15% (890 homes) and 2000-2008 23% (1,360 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 West, Romney Marsh and Walland & Denge Marsh, so a decision in North Downs East 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 East 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 East |
|---|---|
| Dwellings recorded | 6,040 |
| Built pre-1900 | 670 (11%) |
| Built 1900-1918 | 140 (2%) |
| Built 1919-1929 | 190 (3%) |
| Built 1930-1939 | 310 (5%) |
| Built 1945-1954 | 160 (3%) |
| Built 1955-1964 | 530 (9%) |
| Built 1965-1972 | 370 (6%) |
| Built 1973-1982 | 230 (4%) |
| Built 1983-1992 | 220 (4%) |
| Built 1993-1999 | 890 (15%) |
| Built 2000-2008 | 1,360 (23%) |
| Built before 1919 | 13% |
| Built 1919–1939 | 8% |
| Built 1945–2008 | 62% |
| Conservation areas in North Downs East | 3 (Elham, Frogholt…) |
| 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 East has the stock for it — the borough is built largely from 2000s houses and apartments (23% of 6,040 homes), 1990s estate houses (15%) and Victorian and earlier houses (11%), 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 the adopted Folkestone and Hythe local plan and Folkestone and Hythe Council's design guidance for householder work, 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 East contains Elham, Frogholt, Newington conservation areas (Elham designated 1970), 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 East's terraces sit in conservation areas — Elham, Frogholt and Newington 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 East's 3 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 East 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 Elham 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 Elham, Frogholt and Newington, 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 2000s houses and apartments (23% of 6,040 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 6,040 homes here are 23% 2000-2008, 15% 1993-1999, 11% pre-1900, 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 East side returns come up most often:
Side return extension drawings for Elham's conservation area designated in 1970 — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Frogholt's conservation area designated in 1990 — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Newington's conservation area designated in 1974 — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Acrise's civil parish within North Downs East — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Elham's civil parish within North Downs East — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Side return extension drawings for Hawkinge's civil parish within North Downs East — width-checked, party-wall detailed and drawn to Folkestone and Hythe Council's guidance.
Whether a side return in North Downs East 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 Elham and Frogholt, 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 East 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 East 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 Elham and Frogholt, 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 East'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 East 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 East address specifically.
A householder planning application in North Downs East 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 East 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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