Two-storey extension drawings for Mid Sussex homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Mid Sussex District Council's design guidance, delivered in days and revised free until your decision.
Mid Sussex District Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. Mid Sussex contains Albourne, Fairfield, Hurst Wickham conservation areas (Albourne designated 1989), 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 Mid Sussex District Council needs a full application. In conservation areas such as Albourne, Fairfield and Hurst Wickham those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Mid Sussex is determined against an 8-week statutory target.
Albourne (conservation area designated in 1989), Fairfield (conservation area designated in 1989), Hurst Wickham (conservation area designated in 1984), Hurstpierpoint (conservation area designated in 1999), Langton Lane (conservation area designated in 1999), Lindfield (conservation area designated in 1969), Mill Hill Close (conservation area designated in 1999), Burgess Hill Victoria (ward of Mid Sussex), Downland Villages (ward of Mid Sussex), Haywards Heath North (ward of Mid Sussex), Hurstpierpoint (ward of Mid Sussex) and Lindfield (ward of Mid Sussex) — these are the Mid Sussex pockets our drawings cover most. Heritage designations here include Albourne, Fairfield, Hurst Wickham, Hurstpierpoint, Langton Lane, Lindfield and Mill Hill Close. Mid Sussex District Council weighs each proposal against Mid Sussex District Council's adopted local plan and its householder design guidance, where the 10,660 homes here are 16% 1955-1964, 15% pre-1900, 10% 1965-1972, which is what sets the realistic roof and rear-projection options. On roofs the borough is shallow gabled roofs typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, over late-1950s and early-1960s houses (16% of 10,660 homes), Victorian and earlier houses (15%) and late-1960s and early-1970s houses (10%).
Heritage designation is the single biggest variable in Mid Sussex, and it is address-specific: Albourne (conservation area designated in 1989), Fairfield (conservation area designated in 1989), Hurst Wickham (conservation area designated in 1984), Hurstpierpoint (conservation area designated in 1999), Langton Lane (conservation area designated in 1999), Lindfield (conservation area designated in 1969) and Mill Hill Close (conservation area designated in 1999). Inside those boundaries permitted development is curtailed and Mid Sussex 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, Mid Sussex takes in Burgess Hill Victoria, Downland Villages, Haywards Heath North, Hurstpierpoint and Lindfield. No Article 4 direction is recorded for Mid Sussex District Council, but the district's 7 conservation areas still limit permitted development on those streets.
On stock, Mid Sussex is late-1950s and early-1960s houses (16% of 10,660 homes), Victorian and earlier houses (15%) and late-1960s and early-1970s houses (10%) — which is why shallow gabled roofs typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building govern what a loft or rear projection can realistically be. Mid Sussex District Council decided 697 householder applications in the latest published year and granted 93%, with 64% issued inside the eight-week target. We work from the council's own published record.
The full build-period split for Mid Sussex 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.
Mid Sussex District Council also decides for Burgess Hill Victoria, Downland Villages, Haywards Heath North, Hurstpierpoint and Lindfield, so a decision in Mid Sussex 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 Mid Sussex and Mid Sussex 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 | Mid Sussex |
|---|---|
| Dwellings recorded | 10,660 |
| 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 | 20% |
| Built 1919–1939 | 10% |
| Built 1945–2008 | 54% |
| Conservation areas in Mid Sussex | 7 (Albourne, Fairfield…) |
| Conservation areas district-wide | 35 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 697 |
| Householder applications granted | 93% |
| Decided within 8 weeks | 64% |
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 Mid Sussex District Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Adding at first floor changes the question the case officer asks. A single-storey extension is judged mostly on daylight and garden loss; a two-storey extension is judged on overlooking, bulk against the neighbouring roofline, and whether it reads as part of the house or bolted onto it. Mid Sussex is largely late-1950s and early-1960s houses (16% of 10,660 homes), Victorian and earlier houses (15%) and late-1960s and early-1970s houses (10%), and shallow gabled roofs typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building set what a matching roof actually means here.
The permitted-development route exists but is narrow: 3 metres of rear projection, a 7-metre stand-off from the rear boundary, eaves and ridge no higher than the original, and side-facing upper windows obscure-glazed and non-opening below 1.7 metres above floor level. Most two-storey schemes fail one of those, usually the 7-metre boundary rule on a shorter garden, and go in as a full application instead. We establish which route applies before designing, because it changes the drawing set.
Mid Sussex contains Albourne, Fairfield, Hurst Wickham conservation areas (Albourne designated 1989), so materials, fenestration and roof form are assessed against the appraisal. No Article 4 direction is recorded for Mid Sussex District Council, but the district's 7 conservation areas still limit permitted development on those streets.
Some two-storey rear extensions are permitted development. You will need a full application to Mid Sussex District Council if any of these apply:
We set the projection and boundary distance on the site plan, prove the roof-pitch match on the elevations, and specify obscure glazing on the side windows — the three things Mid Sussex District Council checks first — then submit a validation-complete pack.
Below is Mid Sussex District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Mid Sussex District Council granted 93% of 697 householder decisions in the year to 31 March 2026, 64% of them inside eight weeks. Two-storey schemes attract more neighbour comment than any other householder work, so the overlooking and daylight case has to be made on the drawings.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). Compare every borough on our London approval-rate league table.
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Across Albourne, Fairfield and Hurst Wickham, the schemes that succeed set the first floor back from the ground floor, keep the ridge below the original, and treat the flank wall as blank or obscure-glazed. On late-1950s and early-1960s houses (16% of 10,660 homes), matching the eaves line matters more than matching the brick: an extension that carries the existing eaves through reads as original even in a different material.
The 10,660 homes here are 16% 1955-1964, 15% pre-1900, 10% 1965-1972, which is what sets the realistic roof and rear-projection options. We draw the 45-degree daylight test from the neighbour's nearest habitable window, show the window positions in section, and set out the steel and foundation implications early — a two-storey extension changes the load path, so the structural design and the planning design have to be developed together rather than in sequence.
We draw two-storey extensions across Mid Sussex. A few of the areas where they come up most often:
Two storey extension drawings for Albourne — conservation area designated in 1989 — dimensioned against the 3m and 7m limits and drawn to Mid Sussex District Council's guidance.
Two storey extension drawings for Fairfield — conservation area designated in 1989 — dimensioned against the 3m and 7m limits and drawn to Mid Sussex District Council's guidance.
Two storey extension drawings for Hurst Wickham — conservation area designated in 1984 — dimensioned against the 3m and 7m limits and drawn to Mid Sussex District Council's guidance.
Two storey extension drawings for Hurstpierpoint — conservation area designated in 1999 — dimensioned against the 3m and 7m limits and drawn to Mid Sussex District Council's guidance.
Two storey extension drawings for Langton Lane — conservation area designated in 1999 — dimensioned against the 3m and 7m limits and drawn to Mid Sussex District Council's guidance.
Two storey extension drawings for Lindfield — conservation area designated in 1969 — dimensioned against the 3m and 7m limits and drawn to Mid Sussex District Council's guidance.
The first-floor limits are tighter than the ground-floor ones. This is how the common cases compare.
| Scheme | Permitted development? | Deciding limit | What Mid Sussex District Council checks |
|---|---|---|---|
| Two-storey rear, 3m projection, 7m+ to boundary | Often yes | 3m projection / 7m boundary | Roof match, side-window glazing |
| Two-storey rear, under 7m to boundary | No — full application | Rear-boundary distance | Overlooking, daylight, garden loss |
| Two-storey side extension | No — full application | Side elevation | Gap to boundary, street rhythm |
| Two-storey wraparound | No — full application | Combined footprint | Bulk, massing, neighbour amenity |
| Any two-storey on designated land | No — full application | Designation | Character and appearance |
Limits from the GPDO 2015, Schedule 2, Part 1, Class A — two-storey rear extension conditions.
A fixed process built around how Mid Sussex District Council validates and decides two-storey applications.
Send us your Mid Sussex postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Mid Sussex District Council decisions.
We measure the original rear wall, eaves and ridge heights, garden depth and every neighbouring window that faces the site — the inputs the daylight and overlooking case is built from.
Chartered designers develop the two-storey addition to your brief with the roof and eaves resolved, and we coordinate the load path so the structural scheme and the planning scheme are the same building.
We submit the application, manage validation and case-officer queries, and revise the drawings free until Mid Sussex District Council issues its decision.
Often, but not always. A two-storey rear extension can be permitted development if it projects no more than 3 metres, sits at least 7 metres from the rear boundary, does not exceed the existing eaves and ridge, and has obscure-glazed non-opening side windows below 1.7 metres. In Mid Sussex, the 7-metre rule is what most commonly forces a full application to Mid Sussex District Council.
No part of a permitted-development two-storey rear extension may come within 7 metres of the boundary opposite the rear wall of the house. It exists to protect the neighbour behind you from being overlooked at first floor. On shorter Mid Sussex gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Mid Sussex District Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Mid Sussex District Council. They are assessed on the gap to the boundary, whether the street's rhythm of spaces between houses survives, and whether the extension is subordinate to the original. Setting the first floor back from the front building line and down from the ridge is what usually makes the difference.
Overlooking is the most common objection, and it is answerable on the drawings. We position habitable-room windows away from neighbouring gardens, obscure-glaze and fix shut anything on the flank below 1.7 metres, and show the sight lines in section. Where the geometry is tight, a rooflight or a high-level window gives the same daylight without the mutual overlooking that draws objections. This applies to your Mid Sussex address specifically. Mid Sussex District Council is the decision-maker.
Almost certainly. Excavating within 3 metres of a neighbouring structure and building on or up to the boundary both trigger the Party Wall etc. Act 1996, and a two-storey extension usually does both. It is entirely separate from Mid Sussex District Council's planning decision, so we flag the notice period early and detail the junction on the drawings.
Yes. Adding a floor changes the load path from roof to foundation, so beams, padstones and foundation depths all need designing and calculating for building control. Planning and building regulations are separate consents, and the structural set is what building control assesses — we prepare both so the approved scheme is the buildable one. This applies to your Mid Sussex address specifically. Mid Sussex District Council is the decision-maker.
We quote each Mid Sussex two-storey extension individually, because plot depth, roof form and structural complexity vary house to house, and send a fixed, no-obligation quote within one working day. It covers the drawing pack with free revisions until Mid Sussex District Council approves. Call 020 7864 7245 to start.
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