Rear dormer drawings for Harewood roofs — the box across the back slope that turns a low attic into a full-height room, drawn to Test Valley Borough Council's guidance and the volume limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Test Valley Borough Council granted 96% of the householder planning decisions it made in its latest published year — 9 points above the 87% England-wide householder average. Harewood contains Barton Stacey, Chilbolton, Longparish conservation areas (Barton Stacey designated 1984), 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.
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 Barton Stacey, Chilbolton and Longparish those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Harewood is determined against an 8-week statutory target.
Barton Stacey (conservation area designated in 1984), Chilbolton (conservation area designated in 1984), Longparish (conservation area designated in 1983), Wherwell (conservation area designated in 1969), Chilbolton (civil parish within Harewood), Bullington (civil parish within Harewood), Barton Stacey (civil parish within Harewood), Longparish (civil parish within Harewood) and Wherwell (civil parish within Harewood) — these are the Harewood pockets our drawings cover most. Heritage designations here include Barton Stacey, Chilbolton, Longparish and Wherwell. Test Valley Borough Council weighs each proposal against Test Valley Borough Council's development plan and the design policies it applies to householder applications, where the 1,750 homes here are 30% pre-1900, 13% 1945-1954, 10% 1955-1964, 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 simple gabled and hipped roofs typical of early postwar building, over Victorian and earlier houses (30% of 1,750 homes), early postwar houses (13%) and late-1950s and early-1960s houses (10%).
Before anything is drawn we check your address against the designations that apply in Harewood: Barton Stacey (conservation area designated in 1984), Chilbolton (conservation area designated in 1984), Longparish (conservation area designated in 1983) and Wherwell (conservation area designated in 1969). Inside those boundaries permitted development is curtailed and Test Valley 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.
Beyond the designated areas, Harewood takes in Chilbolton, Bullington, Barton Stacey, Longparish and Wherwell. No Article 4 direction is recorded for Test Valley Borough Council, but Harewood's 4 conservation areas still limit permitted development on those streets.
On stock, Harewood is Victorian and earlier houses (30% of 1,750 homes), early postwar houses (13%) and late-1950s and early-1960s houses (10%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and simple gabled and hipped roofs typical of early postwar building govern what a loft or rear projection can realistically be. Test Valley Borough Council decided 533 householder applications in the latest published year and granted 96%, with 76% issued inside the eight-week target. That decision record, not a national figure, is what we design to.
The full build-period split for Harewood runs pre-1900 30% (530 homes), 1900-1918 5% (80 homes), 1919-1929 2% (30 homes), 1930-1939 3% (60 homes), 1945-1954 13% (230 homes), 1955-1964 10% (180 homes), 1965-1972 7% (130 homes), 1973-1982 7% (120 homes), 1983-1992 6% (100 homes), 1993-1999 3% (50 homes) and 2000-2008 5% (80 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.
Test Valley Borough Council also decides for Blackwater, Mid Test, Ampfield & Braishfield, Anna, Bellinger, Bourne Valley and Charlton & the Pentons, so a decision in Harewood 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 Harewood and Test Valley 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 | Harewood |
|---|---|
| Dwellings recorded | 1,750 |
| Built pre-1900 | 530 (30%) |
| Built 1900-1918 | 80 (5%) |
| Built 1919-1929 | 30 (2%) |
| Built 1930-1939 | 60 (3%) |
| Built 1945-1954 | 230 (13%) |
| Built 1955-1964 | 180 (10%) |
| Built 1965-1972 | 130 (7%) |
| Built 1973-1982 | 120 (7%) |
| Built 1983-1992 | 100 (6%) |
| Built 1993-1999 | 50 (3%) |
| Built 2000-2008 | 80 (5%) |
| Built before 1919 | 35% |
| Built 1919–1939 | 5% |
| Built 1945–2008 | 51% |
| Conservation areas in Harewood | 4 (Barton Stacey, Chilbolton…) |
| Conservation areas district-wide | 36 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 533 |
| Householder applications granted | 96% |
| Decided within 8 weeks | 76% |
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 Test Valley Borough 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 Harewood is built for it — the borough runs to Victorian and earlier houses (30% of 1,750 homes), early postwar houses (13%) and late-1950s and early-1960s houses (10%) under steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and simple gabled and hipped roofs typical of early postwar building, and a flat-roofed box across the rear slope is the cheapest cubic metre of full-height space those roofs give up. Test Valley Borough Council tests the dormer against Test Valley Borough Council's development plan and the design policies it applies to householder applications, 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. Harewood contains Barton Stacey, Chilbolton, Longparish conservation areas (Barton Stacey designated 1984), 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 Harewood's streets are protected — Barton Stacey, Chilbolton, Longparish and Wherwell 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 Test Valley Borough Council, but Harewood's 4 conservation areas still limit permitted development on those streets. We confirm the designation before the box is sized.
Many rear dormers in Harewood are permitted development, but the volume and position decide it. You will normally need a full application to Test Valley Borough 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 Test Valley Borough Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Test Valley Borough Council granted 96% of its householder applications in the year to 31 March 2026, and Barton Stacey 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 Barton Stacey, Chilbolton and Longparish, 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 1,750 homes here are 30% pre-1900, 13% 1945-1954, 10% 1955-1964, 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 Test Valley Borough 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 Harewood dormers come up most often:
Dormer loft drawings for Barton Stacey's conservation area designated in 1984 — volume-checked, set-back-detailed and drawn to Test Valley Borough Council's guidance.
Dormer loft drawings for Chilbolton's conservation area designated in 1984 — volume-checked, set-back-detailed and drawn to Test Valley Borough Council's guidance.
Dormer loft drawings for Longparish's conservation area designated in 1983 — volume-checked, set-back-detailed and drawn to Test Valley Borough Council's guidance.
Dormer loft drawings for Wherwell's conservation area designated in 1969 — volume-checked, set-back-detailed and drawn to Test Valley Borough Council's guidance.
Dormer loft drawings for Chilbolton's civil parish within Harewood — volume-checked, set-back-detailed and drawn to Test Valley Borough Council's guidance.
Dormer loft drawings for Bullington's civil parish within Harewood — volume-checked, set-back-detailed and drawn to Test Valley Borough Council's guidance.
Whether a dormer in Harewood 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 Test Valley Borough 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 Barton Stacey and Chilbolton, Class B dormer rights are removed and every dormer needs a full application.
A fixed process built around how Test Valley Borough Council validates and decides dormer applications — most drawings are submission-ready within seven days of survey.
Send us your Harewood 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 Test Valley Borough 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 Test Valley Borough Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Test Valley Borough 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 Harewood you will need a full application to Test Valley Borough Council for a front or side dormer, a box that exceeds the volume, and any dormer in a conservation area such as Barton Stacey and Chilbolton, 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 Harewood 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. Test Valley Borough 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 Test Valley Borough 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 Harewood 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 Test Valley Borough 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 Harewood address specifically.
If your dormer is permitted development, a lawful development certificate from Test Valley Borough 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 Harewood address specifically.
We price each Harewood 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 Test Valley Borough Council approves, and we confirm at the outset whether your box is permitted development or needs an application. Call 020 7864 7245 to start.
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