Mansard Loft Conversion Drawings in Northolt UB5
Fixed-fee, MCIAT-chartered mansard loft conversion drawings for Northolt (UB5) homeowners — London Borough of Ealing validation and local constraints handled from the start.
In Northolt (UB5) we prepare planning and building-control drawings for rear extensions, loft conversions and garage conversions on the district's 1930s semis and interwar homes.
Around the Northolt Village Green conservation area we check the boundary and the setting of nearby heritage buildings first, then advise whether your extension runs as permitted development or needs a full application.
Planning in Northolt (UB5): what to know before you apply
The bulk of 1930s UB5 housing sits outside the small Village Green conservation area and keeps full permitted-development rights for rear extensions and lofts. Plots near the green face conservation-area control on demolition, side extensions and anything affecting the historic setting.
Typical Northolt housing stock
Northolt centres on the historic Village Green around St Mary's Church and Court Farm Road, but the wider UB5 district is predominantly 1930s semi-detached and interwar suburban housing with good-sized rear gardens.
Streets we regularly draw for in Northolt
Ealing Road · Court Farm Road · Church Road · Islip Manor Road
What UB5 is actually built of
Measured from 183 classified residential buildings in UB5, not from a description of the area.
Northolt UB5 housing mix
Residential building form across the UB5 postcode district, from 183 classified buildings.
| Attached on more than one side | 38% |
|---|---|
| Attached on one side | 57% |
| Detached | 4% |
| Median building footprint | 60 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.45 |
| Buildings classified | 183 |
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.
Mansard Loft Conversion Drawings for Northolt (UB5) homes: the package and the process
A mansard is a rebuild of the roof, so the drawings carry more structure than a dormer scheme: the new front and rear slopes with their pitch angles set out, the upstand and party wall junctions, the parapet and gutter detail, and a street-scene elevation showing the new roof against its neighbours.
That street scene usually decides the application. Where a terrace already has approved mansards, the drawing shows the new roof matching their line, pitch and window rhythm; where it would be the first, the case is made on the roof form itself. Either way the argument is drawn, not written.
Mansards belong to terraces and to parapeted stock. The form works because a near-vertical rear wall can rise off the party walls and sit behind a parapet, which is why it is the usual answer in tightly controlled streets and rarely the right answer on a detached house.
What is a mansard loft conversion?
A mansard replaces the rear roof slope — or, less commonly, the front and rear slopes together — with a new near-vertical wall rising from the party walls to a shallow flat roof at the ridge, with small dormer windows set into it. Unlike a dormer, which sits within the existing roof, a mansard changes the shape of the roof itself, which is why it is usually reserved for terraces where the extra headroom and floor area are worth the more involved planning and construction process. Because the new wall runs almost the full width of the house between the party walls, a mansard typically delivers noticeably more usable floor area than a single dormer of any kind, which is why it remains the preferred option on period terraces where every square metre of loft counts.
Does a mansard loft conversion need planning permission in London?
Yes, almost always. Permitted development rights for roof alterations are volume- and shape-limited, and a mansard goes well beyond what those limits allow because it materially alters the roof's profile rather than adding to it. Every mansard we draw is prepared as a full householder planning application, with a design and access statement where the borough requires one, so the council can properly assess the change to the roofline and its impact on neighbours and the street scene.
Why do conservation areas favour mansards?
Many London conservation areas already contain mansard roofs as part of the original streetscape — grand Georgian and Victorian terraces were frequently built with a mansard attic storey behind a parapet, so a matching modern mansard often reads as a restoration of the intended roofline rather than an alteration. Getting that read right depends on matching the existing slate or tile colour, the proportion and spacing of the dormer windows, and the eaves and parapet detailing of the host terrace — details we design in from the first drawing rather than treating as an afterthought.
- Slate or tile colour and coursing matched to the existing roof and neighbouring properties
- Dormer window proportions and spacing aligned to the terrace's existing rhythm
- Eaves, parapet and party wall junctions detailed to sit flush with neighbouring roofs
| Package | Scope | Planning route | Fee from |
|---|---|---|---|
| Rear mansard, planning only | Design, planning drawings and supporting statement | Householder planning | £1,600 |
| Rear mansard, planning and building regs | Planning drawings plus structural and Part L detailing | Householder planning | £2,200 |
| Front and rear mansard | Full roof rebuild on both slopes, with structural | Householder planning | £2,400 |
Mansard Loft Conversion Drawings in Northolt UB5 — FAQs
How much do mansard loft conversion drawings cost in London?+
Can a mansard ever be permitted development?+
How long do mansard drawings take?+
Will a mansard need scaffolding and affect the whole roof?+
Do you handle the party wall process as well as the drawings?+
Do I need planning permission for a rear extension in Ealing?+
What extra control applies in Bedford Park?+
How long does Ealing Council take to decide a householder application?+
Can you help with a loft conversion on a 1930s Ealing semi?+
How much do planning drawings cost in Ealing?+
Get your free Northolt planning assessment
Tell us your Northolt (UB5) address and ambition — we'll confirm feasibility, local constraints and a fixed fee within one working day.