Dormer, hip-to-gable and mansard loft conversion drawings for Horndean Catherington homes — prepared to East Hampshire District Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
East Hampshire District Council granted 91% of the householder planning decisions it made in its latest published year — 4 points above the 87% England-wide householder average. Horndean Catherington contains the Catherington conservation area (Catherington designated 2003), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant interwar (1918–1939) housing stock sets the design brief on most streets.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. Horndean Catherington carries at least one Article 4 direction, and conservation areas including Catherington remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Horndean Catherington is determined against an 8-week statutory target.
Catherington (conservation area designated in 2003) and Horndean (civil parish within Horndean Catherington) — these are the Horndean Catherington pockets our drawings cover most. Heritage designations here include Catherington. East Hampshire District Council weighs each proposal against the adopted East Hampshire local plan and East Hampshire District Council's design guidance for householder work, where the 1,100 homes here are 28% 1983-1992, 13% 1973-1982, 11% 1930-1939, which is what sets the realistic roof and rear-projection options. On roofs the borough is trussed-rafter roofs typical of 1980s building and shallow trussed roofs typical of 1970s building, over 1980s estate houses (28% of 1,100 homes), 1970s and early-1980s houses (13%) and 1930s semi-detached and detached houses (11%).
Horndean Catherington's designated heritage is specific, and it is the first thing we check against your address: Catherington (conservation area designated in 2003). Inside those boundaries permitted development is curtailed and East Hampshire 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, Horndean Catherington takes in Horndean. East Hampshire District Council has 50 recorded Article 4 directions — check the address before assuming PD applies in Horndean Catherington.
On stock, Horndean Catherington is 1980s estate houses (28% of 1,100 homes), 1970s and early-1980s houses (13%) and 1930s semi-detached and detached houses (11%) — which is why trussed-rafter roofs typical of 1980s building and shallow trussed roofs typical of 1970s building govern what a loft or rear projection can realistically be. East Hampshire District Council decided 327 householder applications in the latest published year and granted 91%, with 24% issued inside the eight-week target. Those are the numbers our drawings are prepared against.
The full build-period split for Horndean Catherington runs pre-1900 6% (70 homes), 1900-1918 1% (10 homes), 1919-1929 3% (30 homes), 1930-1939 11% (120 homes), 1945-1954 2% (20 homes), 1955-1964 6% (70 homes), 1965-1972 5% (60 homes), 1973-1982 13% (140 homes), 1983-1992 28% (310 homes), 1993-1999 9% (100 homes) and 2000-2008 3% (30 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.
East Hampshire District Council also decides for Alton Holybourne, Alton Whitedown, Bentworth & Froyle, Bramshott & Liphook, Buriton & East Meon, Four Marks & Medstead, Headley and Liss, so a decision in Horndean Catherington 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.
The Article 4 directions recorded for this council include Ajax House/Plowden House, Liphook, Bedford Road, Petersfield, Bellhanger Enterprises, Bentworth and Bentley Business Park, Bentley. Each removes a specific permitted-development right inside its own boundary, which is why the check is done on the address rather than on the town.
Published figures for Horndean Catherington and East Hampshire 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 | Horndean Catherington |
|---|---|
| Dwellings recorded | 1,100 |
| Built pre-1900 | 70 (6%) |
| Built 1900-1918 | 10 (1%) |
| Built 1919-1929 | 30 (3%) |
| Built 1930-1939 | 120 (11%) |
| Built 1945-1954 | 20 (2%) |
| Built 1955-1964 | 70 (6%) |
| Built 1965-1972 | 60 (5%) |
| Built 1973-1982 | 140 (13%) |
| Built 1983-1992 | 310 (28%) |
| Built 1993-1999 | 100 (9%) |
| Built 2000-2008 | 30 (3%) |
| Built before 1919 | 7% |
| Built 1919–1939 | 14% |
| Built 1945–2008 | 66% |
| Conservation areas in Horndean Catherington | 1 (Catherington) |
| Conservation areas district-wide | 50 |
| Article 4 directions recorded | 50 |
| Householder applications decided | 327 |
| Householder applications granted | 91% |
| Decided within 8 weeks | 24% |
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 East Hampshire District Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Horndean Catherington's roofs set the brief. The borough is built largely from 1980s estate houses (28% of 1,100 homes), 1970s and early-1980s houses (13%) and 1930s semi-detached and detached houses (11%), and its lofts sit under trussed-rafter roofs typical of 1980s building and shallow trussed roofs typical of 1970s building — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. East Hampshire District Council assesses loft proposals against the adopted East Hampshire local plan and East Hampshire District Council's design guidance for householder work, 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 East Hampshire District Council can verify them. Horndean Catherington contains the Catherington conservation area (Catherington designated 2003), 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.
Horndean Catherington also carries protected streets — Catherington among them. East Hampshire District Council has 50 recorded Article 4 directions — check the address before assuming PD applies in Horndean Catherington. We check your address against those designations before a line is drawn.
Many Horndean Catherington 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 East Hampshire 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 East Hampshire 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 East Hampshire District Council's real householder decision record, pulled from official planning statistics and updated as new data lands. East Hampshire District Council granted 91% of its householder applications in the year to 31 March 2026, and Catherington shapes what is approved here. 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 Catherington and Horndean, 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 trussed-rafter roofs typical of 1980s building, that is usually the most efficient use of the roof; where the stock is shallow trussed roofs typical of 1970s building, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The 1,100 homes here are 28% 1983-1992, 13% 1973-1982, 11% 1930-1939, 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 East Hampshire 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 Horndean Catherington roofs come up most often:
Loft conversion drawings for Catherington's conservation area designated in 2003 — measured, volume-checked and drawn to East Hampshire District Council's guidance.
Loft conversion drawings for Horndean's civil parish within Horndean Catherington — measured, volume-checked and drawn to East Hampshire District Council's guidance.
The right loft in Horndean Catherington 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 East Hampshire 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 Catherington and Article 4 directions can remove permitted-development rights.
A fixed process built around how East Hampshire District Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Horndean Catherington 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 East Hampshire 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 East Hampshire District Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until East Hampshire 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 Horndean Catherington the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Catherington or on streets with an Article 4 direction. East Hampshire District Council is the decision-maker.
Generally no. In conservation areas including Catherington, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to East Hampshire District Council. East Hampshire District Council has 50 recorded Article 4 directions — check the address before assuming PD applies in Horndean Catherington. We check your exact address before drawing.
On trussed-rafter roofs typical of 1980s building, common across Horndean Catherington, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is shallow trussed roofs typical of 1970s 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. East Hampshire District Council is the decision-maker.
A householder planning application in Horndean Catherington 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. East Hampshire District Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from East Hampshire 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. This applies to your Horndean Catherington address specifically.
Every roof is different, so we quote each Horndean Catherington project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until East Hampshire 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.