Dormer, hip-to-gable and mansard loft conversion drawings for Mid Sussex homes — prepared to Mid Sussex District Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
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.
Mid Sussex's roofs set the brief. The borough is built largely from 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 its lofts sit under shallow gabled roofs typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Mid Sussex District Council assesses loft proposals against Mid Sussex District Council's adopted local plan and its householder design guidance, and its case officers read each roof against the pair next door and the wider street before they read the plans.
That makes drawing quality decisive. We measure ridge and eaves heights, roof pitch and the existing stair, calculate the added volume against the permitted-development limits exactly, and show the workings on the drawings so Mid Sussex District Council can verify them. Mid Sussex contains Albourne, Fairfield, Hurst Wickham conservation areas (Albourne designated 1989), so materials, fenestration and roof form are assessed against the appraisal, so we resolve it on the page rather than leave it for the case officer to raise.
Mid Sussex also carries protected streets — Albourne, Fairfield, Hurst Wickham, Hurstpierpoint, Langton Lane, Lindfield and Mill Hill Close among them. 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. We check your address against those designations before a line is drawn.
Many Mid Sussex loft conversions proceed without planning permission — a rear dormer within the permitted-development volume limits (40 cubic metres on a terrace, 50 on a semi or detached house) is usually lawful. You will normally need a full application to Mid Sussex District Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Mid Sussex District Council's officers check first — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Mid Sussex District Council's real householder decision record, pulled from official planning statistics and updated 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. Professionally prepared loft drawings anticipate those pressure points before submission, which is why complete, policy-literate packs are decided faster and refused less often than DIY applications.
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 Albourne, Fairfield and Hurst Wickham, the recurring loft is the rear dormer — a box across the back roof slope that turns a cramped attic into a full-height double bedroom and en-suite. On shallow gabled roofs typical of that period's building, that is usually the most efficient use of the roof; where the stock is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
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 dormer inside the volume allowance, keep the flat-roof build-up below the ridge, and set the face back from the eaves as the rules require — so the pack answers Mid Sussex District Council's questions before they are asked. Where permitted-development rights are exhausted or removed, we prepare a householder application composed to the borough's roof-alteration guidance instead.
We draw loft conversions on every street in the borough. A few of the neighbourhoods where Mid Sussex roofs come up most often:
Loft conversion drawings for Albourne's conservation area designated in 1989 — measured, volume-checked and drawn to Mid Sussex District Council's guidance.
Loft conversion drawings for Fairfield's conservation area designated in 1989 — measured, volume-checked and drawn to Mid Sussex District Council's guidance.
Loft conversion drawings for Hurst Wickham's conservation area designated in 1984 — measured, volume-checked and drawn to Mid Sussex District Council's guidance.
Loft conversion drawings for Hurstpierpoint's conservation area designated in 1999 — measured, volume-checked and drawn to Mid Sussex District Council's guidance.
Loft conversion drawings for Langton Lane's conservation area designated in 1999 — measured, volume-checked and drawn to Mid Sussex District Council's guidance.
Loft conversion drawings for Lindfield's conservation area designated in 1969 — measured, volume-checked and drawn to Mid Sussex District Council's guidance.
The right loft in Mid Sussex depends on your roof. This is how the main types compare on planning route and the space they add.
| Loft type | Permitted development? | Space & headroom | What Mid Sussex District Council checks |
|---|---|---|---|
| Rear dormer | Usually yes, within volume limits | Full-height double room at the back | Volume, set-back from eaves, ridge height |
| Hip-to-gable | No — full application | Extends the whole side of the roof | Roof bulk and the symmetry of the pair |
| Mansard | No — full application | Maximum floor area across the roof | Street character, especially in conservation areas |
| Rooflights only | Usually yes (Class C) | Light and headroom, no extra footprint | Whether rooflights sit within the existing slope |
Route depends on your street — conservation areas such as Albourne and Fairfield and Article 4 directions can remove permitted-development rights.
A fixed process built around how Mid Sussex District Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Mid Sussex postcode and roof type. We confirm your conservation and Article 4 status, how much permitted-development volume you have left, and score your odds against live Mid Sussex District Council decisions.
We measure ridge and eaves heights, roof pitch, joist levels and the existing stair — the numbers the volume calculation and head heights depend on.
Chartered designers develop the dormer, hip-to-gable or mansard to your brief, drawn inside the Class B limits or to Mid Sussex District Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Mid Sussex District Council issues its decision.
Often not. A rear dormer within 40 cubic metres on a terrace, or 50 on a semi-detached or detached house, set back from the eaves and no higher than the ridge, is usually permitted development. In Mid Sussex the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Albourne and Fairfield or on streets with an Article 4 direction. Mid Sussex District Council is the decision-maker.
Generally no. In conservation areas including Albourne and Fairfield, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Mid Sussex District Council. 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. We check your exact address before drawing.
On shallow gabled roofs typical of that period's building, common across Mid Sussex, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, a hip-to-gable followed by a rear dormer gains far more usable space but needs planning permission. Our survey confirms which your roof supports before we draw. Mid Sussex District Council is the decision-maker.
A householder planning application in Mid Sussex runs to a statutory eight-week target, and a lawful development certificate to eight weeks as well, though validation can add time if the pack is incomplete. We submit validation-complete drawings and manage case-officer queries to keep the decision on track. Mid Sussex District Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Mid Sussex District Council is council-stamped proof of that — worth having, because every buyer's solicitor will ask for it when you sell. We prepare and submit the certificate application with the same drawing pack.
Every roof is different, so we quote each Mid Sussex project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Mid Sussex District Council approves, and we tell you upfront whether your loft qualifies as permitted development. Call 020 7864 7245 to start.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.