Rear dormer drawings for Colne Valley roofs — the box across the back slope that turns a low attic into a full-height room, drawn to Kirklees Council's guidance and the volume limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Kirklees Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. Colne Valley contains Linthwaite, Marsden, Marsden (Tunnel End) conservation areas (Linthwaite designated 2004), 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), Edwardian (1901–1910) and interwar (1918–1939) 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 Linthwaite, Marsden and Marsden (Tunnel End) those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Colne Valley is determined against an 8-week statutory target.
Linthwaite (conservation area designated in 2004), Marsden (conservation area designated in 1974), Marsden (Tunnel End) (conservation area designated in 1981), Slaithwaite (conservation area designated in 1980) and Wellhouse (conservation area designated in 1981) — these are the Colne Valley pockets our drawings cover most. Heritage designations here include Linthwaite, Marsden, Marsden (Tunnel End), Slaithwaite and Wellhouse. Kirklees Council weighs each proposal against Kirklees Council's adopted local plan and its householder design guidance, where the 7,970 homes here are 40% pre-1900, 12% 1900-1918, 6% 1930-1939, which is what sets the realistic roof and rear-projection options. On roofs the borough is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and pitched and hipped roofs with generous eaves typical of Edwardian building, over Victorian and earlier houses (40% of 7,970 homes), Edwardian houses (12%) and 1930s semi-detached and detached houses (6%).
Before anything is drawn we check your address against the designations that apply in Colne Valley: Linthwaite (conservation area designated in 2004), Marsden (conservation area designated in 1974), Marsden (Tunnel End) (conservation area designated in 1981), Slaithwaite (conservation area designated in 1980) and Wellhouse (conservation area designated in 1981). Inside those boundaries permitted development is curtailed and Kirklees 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 Kirklees Council, but Colne Valley's 5 conservation areas still limit permitted development on those streets.
On stock, Colne Valley is Victorian and earlier houses (40% of 7,970 homes), Edwardian houses (12%) and 1930s semi-detached and detached houses (6%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and pitched and hipped roofs with generous eaves typical of Edwardian building govern what a loft or rear projection can realistically be. Kirklees Council decided 932 householder applications in the latest published year and granted 93%, with 46% issued inside the eight-week target. That decision record, not a national figure, is what we design to.
The full build-period split for Colne Valley runs pre-1900 40% (3,220 homes), 1900-1918 12% (980 homes), 1919-1929 5% (380 homes), 1930-1939 6% (510 homes), 1945-1954 5% (420 homes), 1955-1964 3% (210 homes), 1965-1972 5% (380 homes), 1973-1982 3% (270 homes), 1983-1992 3% (240 homes), 1993-1999 3% (260 homes) and 2000-2008 6% (450 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.
Kirklees Council also decides for Batley East, Cleckheaton, Denby Dale, Golcar, Greenhead, Holme Valley South, Newsome and Almondbury, so a decision in Colne Valley 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 Colne Valley and Kirklees Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Colne Valley |
|---|---|
| Dwellings recorded | 7,970 |
| Built pre-1900 | 3,220 (40%) |
| Built 1900-1918 | 980 (12%) |
| Built 1919-1929 | 380 (5%) |
| Built 1930-1939 | 510 (6%) |
| Built 1945-1954 | 420 (5%) |
| Built 1955-1964 | 210 (3%) |
| Built 1965-1972 | 380 (5%) |
| Built 1973-1982 | 270 (3%) |
| Built 1983-1992 | 240 (3%) |
| Built 1993-1999 | 260 (3%) |
| Built 2000-2008 | 450 (6%) |
| Built before 1919 | 53% |
| Built 1919–1939 | 11% |
| Built 1945–2008 | 28% |
| Conservation areas in Colne Valley | 5 (Linthwaite, Marsden…) |
| Conservation areas district-wide | 59 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 932 |
| Householder applications granted | 93% |
| Decided within 8 weeks | 46% |
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 Kirklees Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The box dormer is the workhorse loft, and most of Colne Valley is built for it — the borough runs to Victorian and earlier houses (40% of 7,970 homes), Edwardian houses (12%) and 1930s semi-detached and detached houses (6%) under steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and pitched and hipped roofs with generous eaves typical of Edwardian building, and a flat-roofed box across the rear slope is the cheapest cubic metre of full-height space those roofs give up. Kirklees Council tests the dormer against Kirklees Council's adopted local plan and its householder design guidance, and because permitted development turns on a number, the volume you propose against the volume you have left is the first thing an officer or a certificate checks.
That is why the arithmetic goes on the drawings. We calculate the box against the 40- or 50-cubic-metre allowance, count any earlier roof enlargement into the total, hold the flat roof below the ridge and set the face back off the eaves so the dormer reads as subordinate. Colne Valley contains Linthwaite, Marsden, Marsden (Tunnel End) conservation areas (Linthwaite designated 2004), so materials, fenestration and roof form are assessed against the appraisal, so the cheeks, the window line and the material are drawn to answer it rather than invite a query.
Where Colne Valley's streets are protected — Linthwaite, Marsden, Marsden (Tunnel End), Slaithwaite and Wellhouse among them — the Class B dormer right is switched off and even a modest rear box needs consent. No Article 4 direction is recorded for Kirklees Council, but Colne Valley's 5 conservation areas still limit permitted development on those streets. We confirm the designation before the box is sized.
Many rear dormers in Colne Valley are permitted development, but the volume and position decide it. You will normally need a full application to Kirklees Council if any of these apply:
We draw the box within its volume allowance, the flat roof below the ridge and the face set back off the eaves — the three things a dormer stands or falls on — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Kirklees Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Kirklees Council granted 93% of its householder applications in the year to 31 March 2026, and Linthwaite shapes what is approved here. A dormer is decided on volume and set-back, so a pack that shows the calculation and the eaves detail is cleared 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 Linthwaite, Marsden and Marsden (Tunnel End), the dormer that goes through is the subordinate rear box: flat roof kept low, cheeks clad to recede, side windows obscure-glazed against overlooking, and the whole thing set back so the original eaves line still reads from the garden. On steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, this returns a full-height double and en-suite from what was standing-room-only, usually inside the permitted-development volume.
The 7,970 homes here are 40% pre-1900, 12% 1900-1918, 6% 1930-1939, which is what sets the realistic roof and rear-projection options. We keep the box off the ridge, match the cheek material to the roof, and where the volume is already spent — or the street is designated — draw the dormer as a householder application composed to Kirklees Council's roof-alteration guidance rather than push a certificate that would be refused.
We draw rear dormers on the terraced and semi-detached streets across the borough. A few of the neighbourhoods where Colne Valley dormers come up most often:
Dormer loft drawings for Linthwaite's conservation area designated in 2004 — volume-checked, set-back-detailed and drawn to Kirklees Council's guidance.
Dormer loft drawings for Marsden's conservation area designated in 1974 — volume-checked, set-back-detailed and drawn to Kirklees Council's guidance.
Dormer loft drawings for Marsden (Tunnel End)'s conservation area designated in 1981 — volume-checked, set-back-detailed and drawn to Kirklees Council's guidance.
Dormer loft drawings for Slaithwaite's conservation area designated in 1980 — volume-checked, set-back-detailed and drawn to Kirklees Council's guidance.
Dormer loft drawings for Wellhouse's conservation area designated in 1981 — volume-checked, set-back-detailed and drawn to Kirklees Council's guidance.
Whether a dormer in Colne Valley needs permission comes down to where it sits and how big the box is. This is how the cases compare.
| Dormer type | Permitted development? | What it gains | What Kirklees Council checks |
|---|---|---|---|
| Rear box, within volume | Usually yes | Full-height room across the back | Volume total, 20cm eaves set-back |
| Rear box, over volume limit | No — full application | A larger room | How far over the allowance, bulk |
| Front or side dormer | No — full application | Light to the front rooms | Visibility from the street, character |
| Dormer in a conservation area | No — full application | Same space, extra scrutiny | Roof form and street appearance |
In conservation areas such as Linthwaite and Marsden, Class B dormer rights are removed and every dormer needs a full application.
A fixed process built around how Kirklees Council validates and decides dormer applications — most drawings are submission-ready within seven days of survey.
Send us your Colne Valley postcode and roof type. We confirm your conservation and Article 4 status, work out how much permitted-development volume you have left, and score your odds against live Kirklees Council decisions.
We measure ridge and eaves heights, roof pitch and the existing loft floor — the numbers the volume calculation, the set-back and the head heights depend on.
Chartered designers develop the box to your brief, drawn inside the Class B volume limits or, where those are exhausted or removed, to Kirklees Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Kirklees Council issues its decision.
Often not. A rear box dormer within 40 cubic metres on a terrace, or 50 on a semi or detached house, set back at least 20 centimetres from the eaves and kept below the ridge, is usually permitted development. In Colne Valley you will need a full application to Kirklees Council for a front or side dormer, a box that exceeds the volume, and any dormer in a conservation area such as Linthwaite and Marsden, where those rights are removed.
The permitted-development limit is a volume, not a footprint: 40 cubic metres of added roof space on a terraced house and 50 on a semi-detached or detached one, and any earlier loft enlargement counts against that total. In Colne Valley the box must also sit below the ridge and back from the eaves. We measure your roof and calculate the exact volume you have left before drawing. Kirklees Council is the decision-maker.
Not under permitted development. A dormer on the front roof slope, or one facing a highway, always needs a full application to Kirklees Council, because it changes how the house reads from the street. Rear box dormers are far more likely to be approved — or to be permitted development outright — which is why almost every Colne Valley dormer we draw sits on the back slope.
Often, on a terrace or semi. If the dormer or the loft steelwork meets the party wall with your neighbour, the Party Wall etc. Act applies and notice must be served before work starts — separately from Kirklees Council's planning decision. We flag the party-wall junction on the drawings so a surveyor can be appointed early and the build is not held up. This applies to your Colne Valley address specifically.
If your dormer is permitted development, a lawful development certificate from Kirklees Council is council-stamped proof of it — worth holding, because a buyer's solicitor will ask for it when you sell. We prepare and submit the certificate with the same measured drawing pack that shows the box within its volume allowance. This applies to your Colne Valley address specifically.
We price each Colne Valley dormer individually, because the roof pitch and the volume left 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 Kirklees Council approves, and we confirm at the outset whether your box is permitted development or needs an application. 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.