Dormer, hip-to-gable and mansard loft conversion drawings for Wormley and Turnford homes — prepared to Broxbourne Borough Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Broxbourne Borough Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. Wormley and Turnford contains Wentworth Cottages, Wormley conservation areas (Wentworth Cottages designated 1985), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant 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 Broxbourne Borough Council needs a full application. In conservation areas such as Wentworth Cottages and Wormley those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Wormley and Turnford is determined against an 8-week statutory target.
Wentworth Cottages (conservation area designated in 1985) and Wormley (conservation area designated in 1979) — these are the Wormley and Turnford pockets our drawings cover most. Heritage designations here include Wentworth Cottages and Wormley. Broxbourne Borough Council weighs each proposal against Broxbourne Borough Council's adopted local plan and its householder design guidance, where the 4,440 homes here are 36% 1973-1982, 11% 2000-2008, 10% 1965-1972, which is what sets the realistic roof and rear-projection options. On roofs the borough is shallow trussed roofs typical of 1970s building and trussed-rafter roofs typical of 2000s building, over 1970s and early-1980s houses (36% of 4,440 homes), 2000s houses and apartments (11%) and late-1960s and early-1970s houses (10%).
Heritage designation is the single biggest variable in Wormley and Turnford, and it is address-specific: Wentworth Cottages (conservation area designated in 1985) and Wormley (conservation area designated in 1979). Inside those boundaries permitted development is curtailed and Broxbourne Borough 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.
No Article 4 direction is recorded for Broxbourne Borough Council, but Wormley and Turnford's 2 conservation areas still limit permitted development on those streets.
On stock, Wormley and Turnford is 1970s and early-1980s houses (36% of 4,440 homes), 2000s houses and apartments (11%) and late-1960s and early-1970s houses (10%) — which is why shallow trussed roofs typical of 1970s building and trussed-rafter roofs typical of 2000s building govern what a loft or rear projection can realistically be. Broxbourne Borough Council decided 280 householder applications in the latest published year and granted 93%, with 53% issued inside the eight-week target. We work from the council's own published record.
The full build-period split for Wormley and Turnford runs pre-1900 4% (170 homes), 1900-1918 1% (30 homes), 1919-1929 1% (50 homes), 1930-1939 4% (190 homes), 1945-1954 2% (90 homes), 1955-1964 3% (150 homes), 1965-1972 10% (460 homes), 1973-1982 36% (1,610 homes), 1983-1992 9% (390 homes), 1993-1999 8% (350 homes) and 2000-2008 11% (510 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.
Published figures for Wormley and Turnford and Broxbourne Borough Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Wormley and Turnford |
|---|---|
| Dwellings recorded | 4,440 |
| Built pre-1900 | 170 (4%) |
| Built 1900-1918 | 30 (1%) |
| Built 1919-1929 | 50 (1%) |
| Built 1930-1939 | 190 (4%) |
| Built 1945-1954 | 90 (2%) |
| Built 1955-1964 | 150 (3%) |
| Built 1965-1972 | 460 (10%) |
| Built 1973-1982 | 1,610 (36%) |
| Built 1983-1992 | 390 (9%) |
| Built 1993-1999 | 350 (8%) |
| Built 2000-2008 | 510 (11%) |
| Built before 1919 | 5% |
| Built 1919–1939 | 5% |
| Built 1945–2008 | 80% |
| Conservation areas in Wormley and Turnford | 2 (Wentworth Cottages, Wormley) |
| Conservation areas district-wide | 6 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 280 |
| Householder applications granted | 93% |
| Decided within 8 weeks | 53% |
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 Broxbourne Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Wormley and Turnford's roofs set the brief. The borough is built largely from 1970s and early-1980s houses (36% of 4,440 homes), 2000s houses and apartments (11%) and late-1960s and early-1970s houses (10%), and its lofts sit under shallow trussed roofs typical of 1970s building and trussed-rafter roofs typical of 2000s building — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Broxbourne Borough Council assesses loft proposals against Broxbourne Borough 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 Broxbourne Borough Council can verify them. Wormley and Turnford contains Wentworth Cottages, Wormley conservation areas (Wentworth Cottages designated 1985), 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.
Wormley and Turnford also carries protected streets — Wentworth Cottages and Wormley among them. No Article 4 direction is recorded for Broxbourne Borough Council, but Wormley and Turnford's 2 conservation areas still limit permitted development on those streets. We check your address against those designations before a line is drawn.
Many Wormley and Turnford 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 Broxbourne Borough Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Broxbourne Borough 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 Broxbourne Borough Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Broxbourne Borough Council granted 93% of its householder applications in the year to 31 March 2026, and Wentworth Cottages 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 Wentworth Cottages and Wormley, 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 trussed roofs typical of 1970s building, that is usually the most efficient use of the roof; where the stock is trussed-rafter roofs typical of 2000s building, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The 4,440 homes here are 36% 1973-1982, 11% 2000-2008, 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 Broxbourne Borough 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 Wormley and Turnford roofs come up most often:
Loft conversion drawings for Wentworth Cottages's conservation area designated in 1985 — measured, volume-checked and drawn to Broxbourne Borough Council's guidance.
Loft conversion drawings for Wormley's conservation area designated in 1979 — measured, volume-checked and drawn to Broxbourne Borough Council's guidance.
The right loft in Wormley and Turnford 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 Broxbourne Borough 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 Wentworth Cottages and Wormley and Article 4 directions can remove permitted-development rights.
A fixed process built around how Broxbourne Borough Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Wormley and Turnford 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 Broxbourne Borough 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 Broxbourne Borough Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Broxbourne Borough 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 Wormley and Turnford the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Wentworth Cottages and Wormley or on streets with an Article 4 direction. Broxbourne Borough Council is the decision-maker.
Generally no. In conservation areas including Wentworth Cottages and Wormley, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Broxbourne Borough Council. No Article 4 direction is recorded for Broxbourne Borough Council, but Wormley and Turnford's 2 conservation areas still limit permitted development on those streets. We check your exact address before drawing.
On shallow trussed roofs typical of 1970s building, common across Wormley and Turnford, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is trussed-rafter roofs typical of 2000s 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. Broxbourne Borough Council is the decision-maker.
A householder planning application in Wormley and Turnford 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. Broxbourne Borough Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Broxbourne Borough 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 Wormley and Turnford address specifically.
Every roof is different, so we quote each Wormley and Turnford project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Broxbourne Borough Council approves, and we tell you upfront whether your loft qualifies as permitted development. Call 020 7864 7245 to start.
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Same fixed quotes, same fast drawings — wherever your project is.