Kennington · SE11 · Lambeth

Loft Conversion Drawings in Kennington SE11

Fixed-fee, MCIAT-chartered loft conversion drawings for Kennington (SE11) homeowners — London Borough of Lambeth validation and local constraints handled from the start.

Kennington SE11 is a tight grid of late-Georgian and early-Victorian terraces a short walk from the Oval, where most homeowners look to rear kitchen extensions and loft conversions to add space without altering the protected street frontage.

Because the Kennington and Walcot Conservation Areas cover much of the outcode, we always confirm which boundary a property sits inside before advising permitted development versus a full householder application — conservation-area status quietly removes several rights a comparable house outside would keep.

Proposed floor plan

Kennington SE11

Kennington (SE11) — planning at a glance

Council: London Borough of Lambeth
Postcode district: SE11
Planning portal: View the Lambeth planning portal
Housing stock: Smart brick terraces that grew from the late 18th century onward, including the Georgian set pieces around Cleaver Square. Many are three- and four-storey flat-fronted houses, now often split into flats or run as family homes with scope for rear and lower-ground extensions.
Article 4: Lambeth's Article 4 directions for the St Marks conservation area, including Hanover Gardens, remove some permitted development rights for external building alterations.
Conservation: Kennington Conservation Area (CA08)Walcot Conservation Area
Sample streets: Cleaver Square · Cardigan Street · Courtenay Street · Kennington Road
Local constraints: Kennington Conservation Area controls front elevations, roof lines and materials, so rooflight and dormer choices on loft conversions are scrutinisedCleaver Square and the flat-fronted Georgian terraces mean side and front alterations rarely qualify as permitted developmentWalcot Conservation Area overlaps the northern edge of the outcode, adding a second appraisal boundary to check before design

Planning in Kennington (SE11): what to know before you apply

Most Kennington projects run as full householder applications to Lambeth given the conservation-area coverage, with rear extensions and rooflight lofts the usual approvable route. Front and roof changes need the closest attention. We check the exact CA boundary and any listing before choosing the route.

Typical Kennington housing stock

Smart brick terraces that grew from the late 18th century onward, including the Georgian set pieces around Cleaver Square. Many are three- and four-storey flat-fronted houses, now often split into flats or run as family homes with scope for rear and lower-ground extensions.

Streets we regularly draw for in Kennington

Cleaver Square · Cardigan Street · Courtenay Street · Kennington Road

What SE11 is actually built of

Measured from 291 classified residential buildings in SE11, not from a description of the area.

Kennington SE11 housing mix

Residential building form across the SE11 postcode district, from 291 classified buildings.

Attached on more than one side	73%
Attached on one side	23%
Detached	4%
Median building footprint	59 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate	4.87
Buildings classified	291

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 2026-09-22.

Loft Conversion Drawings for Kennington (SE11) homes: the package and the process

A loft stands or falls on the section drawing. It has to prove usable head height along the length of the room, a staircase that meets the going and headroom rules without eating the landing below, floor joists sized for a habitable load rather than storage, and a means of escape that Building Control will accept — usually a protected stair, sometimes an escape window.

The same section does the planning work too, showing roof volume, ridge height and how the new form sits against the existing roof. Where the conversion relies on permitted development we set the volume out on the drawing as a calculation, so the position is evidenced rather than asserted.

Roof shape decides which conversion is even possible. A hipped roof has to become a gable before it offers full-width space; a shallow pitch may not deliver head height at any cost; and a terrace with a rear outrigger opens up an L-shaped option a detached house has no use for.

Do I need planning permission for a loft conversion in London?

Many loft conversions are permitted development, but volume limits (40m³ for terraced homes, 50m³ for detached and semi-detached), materials and the presence of a conservation area or Article 4 direction can change that. We assess your roof and borough and recommend the fastest lawful route — often a Lawful Development Certificate rather than a full planning application. A certificate is worth having even when the work is clearly permitted: it gives your buyer's solicitor and your building-control surveyor documentary proof the loft is lawful, which matters when you sell.

Which loft conversion type suits your roof?

The best conversion depends on your roof shape and the headroom it offers.

Dormer

A box dormer adds headroom and floor area at the rear and is the most common London loft — frequently permitted development.

Mansard

A mansard rebuilds the rear (or front and rear) roof slope for maximum space, common in conservation areas but usually needing planning permission.

Hip-to-gable

Extends a hipped roof to a vertical gable, ideal for semi-detached and end-of-terrace homes.

Velux / rooflight

The simplest option — rooflights within the existing roofline, almost always permitted development.

What building regulations apply to a loft conversion?

Loft conversions must meet fire escape, structural and insulation standards — a protected stairway, adequate floor joists and beams, and often a means of escape window. A loft that adds a third storey to a two-storey house triggers stricter fire-separation rules, including fire doors to habitable rooms off the new stairway. We coordinate the structural calculations with the drawings so the build proceeds without delays.

London loft conversion types, routes and typical fees
Loft type	Best for	Usual route	Fee from
Velux / rooflight	Roofs with existing headroom	Permitted development / LDC	£695
Dormer	Rear headroom + floor area	Permitted development / LDC	£695
Hip-to-gable	Semi and end-of-terrace roofs	Permitted development or planning	£745
Mansard	Maximum space, conservation areas	Full planning application	£845

Example loft conversion drawings sheet showing the existing and proposed arrangement at scale, as we draw it for Kennington (SE11) properties — Example sheet showing how we draw loft conversion drawings to London Borough of Lambeth's validation standards for Kennington (SE11) properties.

Also in Kennington SE11

Planning Permission Planning Drawings Architectural Drawings House Extension Drawings Hip-to-Gable Loft Conversion Drawings Loft Conversion Drawings across Lambeth Loft Conversion Drawings across London

FAQ

Loft Conversion Drawings in Kennington SE11 — FAQs

How much do loft conversion drawings cost in London?+

Drawing packages typically start around £695 for a permitted development loft and rise for mansards and full planning applications. Structural calculations for the steels are a separate fee from £745 unless you choose the all-inclusive package. We quote a fixed fee upfront.

Will my loft need a fire escape window?+

Most loft conversions require a means of escape and a protected stairway under building regulations. We design these in from the start.

Is a dormer loft permitted development?+

Often yes, within the volume limits and outside conservation areas — but we always check your specific property and borough first, free.

Can I convert my loft if I live in a conservation area?+

Usually yes, but conservation areas and Article 4 directions often remove permitted development for rear dormers, so the work needs a full planning application and a roof-form the council will accept — commonly a mansard or discreet rear dormer. We check your borough's designation before recommending a route.

Do you provide the structural calculations for the steels?+

Yes, through a named, insured engineer, as a separate service from £745. The calculations cover the floor beams and any ridge or purlin steels, and we draw them onto your loft set; our all-inclusive package, £1,845–£3,145, includes them. If you already have an engineer, we work from their figures.

Do I need planning permission for a side-return extension in Lambeth?+

On many of Lambeth's Victorian and Edwardian terraces in Brixton, Clapham and Streatham, a single-storey side-return or rear extension can fall within permitted development, so a full application isn't always required. In a conservation area such as Clapham Common or Brixton Water Lane, side extensions, rear extensions over one storey, dormers and other roof enlargements, and cladding are not permitted development. We check your street's designation first and can confirm permitted development with a Lawful Development Certificate.

My Lambeth home is a converted flat — does that change things?+

It often does. Many Lambeth houses are converted flats, so ownership, lease and party-wall considerations can matter as much as the planning route, and the freeholder's agreement is usually needed alongside planning. We resolve the ownership and shared-structure context before drawing so the scheme is deliverable, not just consentable.

What does Lambeth's HMO Article 4 direction affect?+

Lambeth applies an Article 4 direction removing permitted development rights for HMO conversions (C3 to C4) in designated parts of the borough, so a change of use to a house in multiple occupation needs a full application there. It doesn't affect a standard family extension, but we confirm whether it applies to your address and use before advising on a route.

How long does Lambeth Council take to decide?+

The clock for a valid Lambeth application is eight weeks from the next day, though a written agreement can add time. The terraced grids around Clapham and Brixton are party-wall-sensitive, so we follow the borough's residential extension guidance.

How much do planning drawings cost in Lambeth?+

We agree a fixed fee before starting, taken from our published price list, with free redraws until Lambeth approves. A side-return, a loft and a flat-conversion scheme differ in complexity, so we quote once we understand your street and project rather than charging by the hour.

Free Fixed Quote

Get your free Kennington planning assessment

Tell us your Kennington (SE11) address and ambition — we'll confirm feasibility, local constraints and a fixed fee within one working day.