Orangery and conservatory drawings for Brent homes — checked against the Class A rear limits and the 30m² building-regulations exemption, drawn to Brent Council's guidance and revised free until your decision.
Brent Council granted 85.5% of the householder planning decisions it made in its latest published year — 4.799999999999997 points below the 90.3% England-wide householder average. Flat conversions and HMOs draw heightened scrutiny on amenity, refuse storage and cycle parking given the borough's Article 4 stance, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. Brent carries at least one Article 4 direction, and conservation areas including Queen's Park, Mapesbury and Sudbury Court remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Brent is determined against an 8-week statutory target.
Kilburn (dense Victorian terraces, much of it converted to flats), Willesden (Victorian and Edwardian terraces around Willesden Green), Wembley (interwar semis and postwar housing near the stadium), Harlesden (tightly packed Victorian terraced streets), Kingsbury (classic 1930s Metro-land semi-detached estates) and Queen's Park (red-brick terraces framing the Queen's Park conservation area) — these are the Brent pockets our drawings cover most. Heritage designations here include Queen's Park, Mapesbury, Sudbury Court, Roundwood and Brondesbury. Brent Council weighs each proposal against Brent Local Plan and the Design Guide for New Development SPD, where the loss of family-sized housing is resisted, so schemes that carve up larger homes must justify the mix. Converted flats are very common through Kilburn, Willesden and Cricklewood, and none of them hold householder permitted-development rights.. On roofs the borough is London butterfly roofs on the inner terraces and hipped roofs on the Metro-land semis, over Victorian and Edwardian terraces across Kilburn and Willesden, interwar semi-detached houses around Wembley and Kingsbury and converted period flats and maisonettes.
The difference is not marketing. A conservatory is predominantly glazed — at least three quarters of the roof and half of the walls — which is what earns it the building-regulations exemption. An orangery has a solid masonry perimeter with a glazed lantern set into a flat roof, so it usually reads as a conventional extension for building control and has to meet Part L thermal standards, Part A structure and Part B fire like any other room.
Both are judged the same way for planning: as rear extensions, against the Class A depth, height and eaves limits, and against Brent Local Plan and the Design Guide for New Development SPD. Brent is largely Victorian and Edwardian terraces across Kilburn and Willesden, interwar semi-detached houses around Wembley and Kingsbury and converted period flats and maisonettes, and the design question is usually whether the glazing reads as a lightweight addition to that stock or as a bolted-on conservatory kit. On period houses, an orangery with a properly proportioned lantern almost always sits better than a full-height glazed box.
In conservation areas such as Queen's Park and Mapesbury, rear glazing is assessed on visibility from the street and on the effect on the rear elevation's character. Brent operates a borough-wide Article 4 direction removing the permitted right to convert family homes into small HMOs, and conservation areas such as Mapesbury layer further restrictions on top.
Many conservatories are permitted development. You will need an application to Brent Council where any of these apply:
We check the scheme against the Class A planning limits and against the building-regulations exemption at the same time, so you know before committing whether you are building an exempt conservatory or a fully regulated room.
Below is Brent Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Brent grants a little below the London average of householder applications, with intense conversion and HMO demand meeting firm amenity scrutiny the defining tension. Glazed rear additions are judged on depth, eaves height and how the glazing meets the existing elevation.
Source: MHCLG planning application statistics (householder decisions, rolling year). Compare every borough on our London approval-rate league table.
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Across Kilburn, Willesden and Wembley, the schemes that succeed keep the eaves below the neighbour's ground-floor cill line, set the glazing back from the boundary, and use a solid parapet or brick perimeter to tie the addition into the house. On victorian and edwardian terraces across kilburn and willesden, a lantern set in a flat roof usually reads better than a pitched glazed roof, and it avoids the summer overheating that makes full conservatories unusable for months a year.
Flat conversions and HMOs draw heightened scrutiny on amenity, refuse storage and cycle parking given the borough's Article 4 stance. The decision worth making early is whether to keep the separating doors. Keeping them preserves the building-regulations exemption but leaves you with a room that is not part of the house; removing them creates one continuous space but brings the whole addition inside Part L, which changes the glazing specification and usually the heating design too. We set out both versions before you commit.
We draw glazed rear additions across Brent. A few of the areas where they come up most often:
Orangery and conservatory drawings for Kilburn — dense Victorian terraces, much of it converted to flats — checked against the Class A limits and drawn to Brent Council's guidance.
Orangery and conservatory drawings for Willesden — Victorian and Edwardian terraces around Willesden Green — checked against the Class A limits and drawn to Brent Council's guidance.
Orangery and conservatory drawings for Wembley — interwar semis and postwar housing near the stadium — checked against the Class A limits and drawn to Brent Council's guidance.
Orangery and conservatory drawings for Harlesden — tightly packed Victorian terraced streets — checked against the Class A limits and drawn to Brent Council's guidance.
Orangery and conservatory drawings for Kingsbury — classic 1930s Metro-land semi-detached estates — checked against the Class A limits and drawn to Brent Council's guidance.
Orangery and conservatory drawings for Queen's Park — red-brick terraces framing the Queen's Park conservation area — checked against the Class A limits and drawn to Brent Council's guidance.
The planning test is the same for both. The building-regulations test is not.
| Structure | Planning route | Building regulations | Practical effect |
|---|---|---|---|
| Conservatory under 30m², doors retained | Class A rear extension limits | Largely exempt | Cheaper build, unheated in winter |
| Conservatory, doors removed | Class A rear extension limits | Part L applies in full | Continuous space, higher spec glazing |
| Orangery with solid perimeter and lantern | Class A rear extension limits | Fully regulated | Usable year round, better on period houses |
| Any of the above beyond the depth limits | Full householder application | As above | 8-week determination |
| Any of the above on designated land | Full householder application | As above | Design and visibility assessed |
Planning limits from the GPDO 2015, Schedule 2, Part 1, Class A; exemption criteria from the Building Regulations 2010, Schedule 2, Class 7.
A fixed process covering both consents, because they pull in different directions.
Send us your Brent postcode and house type. We confirm the Class A limits that apply, check designation status, and score your odds against live Brent Council decisions.
We measure the rear elevation, eaves and ground levels, and the neighbouring boundary — the numbers that decide both the projection limit and the 2-metre eaves rule.
Chartered designers develop the orangery or conservatory to your brief, and we set out clearly whether it stays inside the building-regulations exemption or becomes a fully regulated room.
We submit the certificate or application, manage validation and officer queries, and revise free until Brent Council decides.
Often not. A conservatory is treated as a rear extension, so it can be permitted development within the Class A limits — 3 metres of projection on a terrace or semi, 4 metres on a detached house, with eaves under 3 metres where it sits within 2 metres of a boundary. In Brent you will need an application to Brent Council beyond those limits, and on designated land such as Queen's Park and Mapesbury.
A conservatory is largely exempt if it is under 30 square metres, at ground level, separated from the house by external-quality doors, and has at least 75% of its roof and 50% of its walls glazed. Glazing, electrics and any drainage work still have to comply. Remove the separating doors and the exemption falls away — the space becomes part of the house and Part L thermal standards apply. This applies to your Brent address specifically. Brent Council is the decision-maker.
For planning, none — both are rear extensions assessed against the same Class A limits by Brent Council. The difference is in building control: an orangery's solid perimeter and flat roof with a lantern usually means it fails the glazing test for exemption, so it is fully regulated. That is why an orangery costs more to build but is comfortable in January.
Usually yes at the rear, though permitted-development rights are narrower on designated land and an Article 4 direction can remove them entirely. The assessment turns on whether the addition is visible from the street and how it meets the original rear elevation. A restrained orangery in matching brick with a lantern is consistently easier to get through than a proprietary glazed conservatory. This applies to your Brent address specifically. Brent Council is the decision-maker.
A fully glazed roof will, unless it is specified for it. That is the practical reason most of our clients end up building an orangery instead: a solid insulated roof perimeter with a lantern gives daylight without the greenhouse effect, and keeps the space usable across the year. We raise it at design stage because it is much cheaper to solve on paper than after the build. This applies to your Brent address specifically. Brent Council is the decision-maker.
If you excavate foundations within 3 metres of a neighbouring structure and deeper than its foundations, or build on the boundary itself, the Party Wall etc. Act 1996 applies and notice must be served. That is separate from Brent Council's planning decision. We flag it at design stage so the notice period does not delay the start on site.
We quote each Brent orangery or conservatory individually, because the structure and the roof form change the work considerably, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Brent Council approves. Call 020 7864 7245 to start.
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