Rear extension design for a period house in Stanmore conservation area, Harrow

Stanmore · HA7 · Harrow

Dormer Loft Conversion Drawings in Stanmore HA7

Fixed-fee, MCIAT-chartered dormer loft conversion drawings for Stanmore (HA7) homeowners — London Borough of Harrow validation and local constraints handled from the start.

Stanmore (HA7) sits on the wooded high ground of north Harrow, where Georgian cottages on Stanmore Hill and large period houses along Old Church Lane make rear and side extensions a careful design exercise rather than a routine build.

Two conservation areas plus Harrow's Article 4 directions mean front-facing works and many minor alterations here need consent, so we always check the exact boundary and Article 4 status before deciding between permitted development and a full householder application.

Proposed floor plan

Stanmore HA7

Stanmore (HA7) — planning at a glance

Council: London Borough of Harrow
Postcode district: HA7
Planning portal: View the Harrow planning portal
Housing stock: Stanmore Hill mixes Georgian and Victorian cottages with grand detached villas on one of the highest points in London. Old Church Lane, of medieval origin around the 1632 old church, carries substantial period houses in mature wooded plots.
Article 4: Harrow has made Article 4 directions across its Stanmore conservation areas, removing permitted-development rights for front-facing changes such as windows, doors, roofs and boundary walls.
Conservation: Stanmore Hill Conservation AreaOld Church Lane Conservation Area
Sample streets: Stanmore Hill · Old Church Lane · Dennis Lane · Green Lane
Local constraints: Stanmore Hill and Old Church Lane conservation-area controls on front elevations, roofs and boundary treatmentsArticle 4 restrictions requiring permission for otherwise-permitted alterationsMature tree cover and likely TPOs on the wooded hillside plots

Planning in Stanmore (HA7): what to know before you apply

Inside the Stanmore Hill or Old Church Lane conservation areas, expect a full householder application for most visible work and reduced permitted-development scope under Article 4. Rear extensions can still succeed where scale, materials and tree impact respect the historic setting.

Typical Stanmore housing stock

Stanmore Hill mixes Georgian and Victorian cottages with grand detached villas on one of the highest points in London. Old Church Lane, of medieval origin around the 1632 old church, carries substantial period houses in mature wooded plots.

Streets we regularly draw for in Stanmore

Stanmore Hill · Old Church Lane · Dennis Lane · Green Lane

What HA7 is actually built of

Measured from 131 classified residential buildings in HA7, not from a description of the area.

Stanmore HA7 housing mix

Residential building form across the HA7 postcode district, from 131 classified buildings.

Attached on more than one side	27%
Attached on one side	55%
Detached	18%
Median building footprint	78 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate	1.63
Buildings classified	131

Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-08-17.

Dormer Loft Conversion Drawings for Stanmore (HA7) homes: the package and the process

A rear dormer is drawn to a tight set of geometric tests: the volume it adds, its set-back from the eaves, whether it sits below the ridge line, and how it meets the roof slope at the sides. Each of those is a dimension on the drawing rather than a description, because that is how the case is assessed.

Side-facing windows and the cheek treatment are where dormer schemes most often attract conditions. We show glazing type and opening restrictors on the elevations, and detail the cheeks and roof junction on the section, so the approved drawing is one your builder can work from without reinterpretation.

The rear roof slope is the whole opportunity. A house with a rear outrigger can carry an L-shaped dormer over both roofs, while a simple double-pitch roof takes a box dormer and nothing more — and a shallow pitch may not give usable height under either.

Is a rear dormer loft conversion permitted development in London?

A single rear dormer is the loft conversion most likely to qualify as permitted development in London, provided it stays within the volume allowance — 40 cubic metres for terraced houses, 50 cubic metres for detached and semi-detached homes. The dormer must not extend beyond the highest part of the existing roof, should be set back from the eaves where practical, and is normally finished in materials that match the existing roof. Where the numbers work, we recommend a Lawful Development Certificate rather than a full planning application, because it is faster and gives you a legal record that the work was lawful.

Box dormer or L-shaped dormer — which suits a London terrace?

A box dormer is a simple flat-roofed addition set into the rear roof slope, adding headroom and floor area over the main roof void. An L-shaped dormer links that main-slope dormer to a second dormer over the rear closet wing — the small rear addition found on most Victorian and Edwardian London terraces — and is popular because it captures far more usable space over the stairwell for a similar planning risk. Both are generally assessed the same way for permitted development, but the closet-wing element of an L-shaped dormer needs its own structural support, which we detail on the drawings and coordinate with the structural calculations.

Box dormer: single flat-roofed addition on the main rear slope
L-shaped dormer: main-slope dormer combined with a closet-wing dormer
Both are typically finished in matching brick, tile-hung or render to suit the host roof

Do front dormers need planning permission?

Permitted development for roof alterations generally excludes elevations that front a highway, so a dormer on the front roof slope facing the street almost always needs a full householder planning application, even where a rear dormer on the same house would be permitted development. Front dormers are also more visible to the council and to neighbours, so proportion, materials and set-back from the ridge and eaves carry more weight in the assessment. We draw front dormers to sit comfortably within the roofline rather than dominating it, which is what most validation teams are looking for, and where a front dormer alone will not deliver the space you need, we assess whether combining it with a rear dormer or rebuilding the rear slope as a mansard makes more sense.

Typical dormer loft conversion drawing packages
Dormer type	Typical route	Structural scope	Fee from
Single rear box dormer	Permitted development / LDC	Standard joist and beam upgrade	£1,100
L-shaped rear dormer	Permitted development / LDC	Additional closet-wing support	£1,300
Front dormer	Householder planning	Standard joist and beam upgrade	£1,600
Dormer in a conservation area	Householder planning	Standard joist and beam upgrade	£1,600

Sheet from a dormer loft conversion drawings package drawn for a Stanmore property in HA7, showing the existing and proposed arrangement at scale — A sheet from the dormer loft conversion drawings package we submit to London Borough of Harrow for Stanmore (HA7) properties.

Also in Stanmore HA7

Planning Permission Planning Drawings Architectural Drawings Building Regulations Drawings Loft Conversion Drawings Dormer Loft Conversion Drawings across Harrow Dormer Loft Conversion Drawings across London

FAQ

Dormer Loft Conversion Drawings in Stanmore HA7 — FAQs

How much do dormer loft conversion drawings cost in London?+

A single rear box dormer on the permitted development route typically starts around £1,100 for a full drawing set. L-shaped and front dormers cost more because of the extra structural design and, for front dormers, the planning application itself — we quote a fixed fee once we have seen your roof.

Is my dormer definitely permitted development?+

Not automatically — it depends on the volume you are adding, which elevation the dormer sits on, and whether a conservation area or Article 4 direction applies to your address. We check this free before recommending a route, and if a previous loft or roof extension has already used up part of your allowance, we factor that into the calculation too.

How long do dormer loft conversion drawings take?+

Typically around 7 days from survey to a full drawing set delivered to your online portal, whether you are going down the Lawful Development Certificate route or full planning.

Will I need an architect for a dormer loft conversion?+

No — as MCIAT-chartered architectural technologists we produce the same council-accepted drawings an architect would, typically at a lower fee, with structural calculations coordinated in-house.

What if my roof suits a different loft conversion type?+

If your roof is hipped, a hip-to-gable conversion may add more space than a dormer alone; if you are in a conservation area needing a full rebuild of the roof slope, a mansard may suit better. We assess your roof against all three before recommending one.

Do I need planning permission for a loft conversion in Harrow?+

Harrow's Metro-land semis and detached houses in Rayners Lane, Kenton and Stanmore suit hip-to-gable and dormer lofts, which frequently qualify as permitted development within the volume limits. The exceptions are the conservation areas — Harrow on the Hill and Pinner's historic core — and the Article 4 wards. We check your address and can confirm permitted development with a Lawful Development Certificate.

What does Harrow expect for a rear extension on a 1930s semi?+

The council pays close attention to preserving the rhythm and building line of its interwar suburban streets, so extensions are expected to respect the established line and roof form. Many single-storey rear extensions still fall within permitted development; where a full application is needed, we design to the borough's residential guidance so it validates and approves without repeated revisions.

Can I extend a home in Harrow on the Hill or Pinner?+

Yes, but these historic conservation areas carry a heritage setting and long views the council protects closely, so permitted development is often restricted and a full, context-led application is required. We design to the character of the area — materials, proportions and rooflines — and evidence the heritage considerations so the submission stands up.

How long does Harrow Council take to decide?+

Harrow determines most householder applications within the statutory eight-week period once validated. The commonest delay is a validation query, so we prepare Harrow submissions to the council's checklist with correctly scaled existing and proposed drawings and a location plan to keep the application on track.

How much do planning drawings cost in Harrow?+

We work to a fixed fee agreed upfront, usually around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Harrow approves. The figure depends on the scheme — a dormer loft differs from a double-storey extension — so we confirm it once we understand your project rather than billing by the hour.

Free Fixed Quote

Get your free Stanmore planning assessment

Tell us your Stanmore (HA7) address and ambition — we'll confirm feasibility, local constraints and a fixed fee within one working day.