Planning Permission in Lewisham: 2026 Guide

What are the odds in Lewisham?

Good on application, poor on appeal. Lewisham approved 86.3% of the 2,037 householder applications it decided and settled 95.3% inside eight weeks, but the Inspectorate allowed only 33.2% of the 313 appeals that followed a refusal. It also holds 89 Article 4 areas and issued 1,221 lawful development certificates.

Sources: decision figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026; registers from the MHCLG Planning Data Platform, retrieved 1 September 2026; appeals from Planning Inspectorate casework decided 2016–2026. The pairing matters: a Lewisham refusal is comparatively hard to overturn, so the case is better made before the decision than after it.

Planning in Lewisham — what you need to know

Lewisham has the sharpest contradiction in this guide. It approved 86.3% of householder applications, has no borough-wide Article 4 Direction, and is by reputation one of south London's easier councils — yet of the deep rear extensions where a neighbour objected and prior approval was needed, it granted six and refused 135 (MHCLG planning statistics, retrieved 1 September 2026). That 4.3% is the lowest grant rate of any London borough. Ordinary work sails through; going deep does not.

Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD. The borough has a population of approximately 302,000 residents and covers postcodes SE3, SE4, SE6, SE8, SE12, SE13, SE14, SE23, SE26.

The housing stock in Lewisham is predominantly victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford. This mix of property types means that Lewisham Council deals with a wide range of applications, from rear extensions on terraced houses to loft conversions on semi-detached properties and full refurbishments of period homes in conservation areas.

With 30 designated conservation areas and no current Article 4 Directions, Lewisham has a planning environment that balances heritage protection in conservation areas with generally permissive policies elsewhere.

At Architectural Drawings London, we prepare planning drawings and building regulations drawings for properties across all Lewisham postcodes. Our MCIAT chartered architectural technologists have experience with Lewisham Council and understand the specific policies, design guides, and precedents that apply in Lewisham.

Where do Lewisham’s 89 Article 4 areas apply?

Lewisham does not currently have any borough-wide Article 4 Directions that restrict Permitted Development rights for standard householder developments such as loft conversions, rear extensions, or outbuildings.

This means that most common home improvements in Lewisham can proceed under Permitted Development without needing to apply for planning permission, provided they meet the national criteria for size, height, and position. We recommend applying for a Lawful Development Certificate (£274) to formally confirm that your project qualifies as Permitted Development. This provides legal certainty and is valuable when selling the property.

Even without Article 4 Directions, properties in Lewisham's 30 conservation areas have additional restrictions on permitted development. We check the specific restrictions affecting your property as part of our initial assessment.

How many conservation areas does Lewisham have?

Lewisham has 30 designated conservation areas. Notable conservation areas include:

• Blackheath
• Deptford High Street
• Forest Hill
• Hither Green
• Lee Green

In conservation areas, Permitted Development rights are more restricted than in non-designated areas. Key restrictions include:

• No cladding, stone, artificial stone, pebble dash, render, timber, plastic, or tile to any external wall without planning permission
• No side extensions under Permitted Development
• Rear extensions are limited and may require planning permission
• Dormer loft conversions facing the highway require planning permission
• Satellite dishes on front elevations or chimneys are not permitted
• Demolition of gates, walls, fences, or other boundary treatment requires planning permission

Thirty conservation areas across a borough with no Article 4 Direction, which makes the designation boundary unusually decisive: on one side of it the rules are the national ones, on the other the council is assessing your materials and roofline. Lewisham also served eight temporary stop notices over three years (MHCLG planning statistics, retrieved 1 September 2026), a reminder that it does act on work started without consent. We check the boundary against the address, not the postcode.

Popular projects in Lewisham

Brockley, Honor Oak and Forest Hill are made of the Victorian and Edwardian terraces that produce side-return kitchens and rear dormer lofts in volume, and Catford and Hither Green add interwar semis on top. The borough issued 1,221 lawful development certificates in three years and recorded 164 larger extensions as needing no prior approval at all (MHCLG planning statistics, retrieved 1 September 2026) — so most of this work never becomes an application. The exception is the one above, and it is worth designing around.

Loft conversions

Lewisham has extensive streets of terraced housing, making loft conversions one of the most popular home improvement projects in the borough. A rear dormer loft conversion on a typical Victorian or Edwardian mid-terrace can add 20-30 square metres of living space and significant value to the property. In many cases, rear dormers fall under Permitted Development rights, though properties in conservation areas or subject to Article 4 Directions will need full planning permission. We prepare loft conversion drawings for properties across Lewisham.

Side-return and rear extensions

The classic Victorian and Edwardian terrace layout in Lewisham leaves a side return passage that is prime territory for a kitchen extension. A single-storey rear or side-return extension can often be built under Permitted Development, extending up to 6 metres from the rear wall (or up to 8 metres for detached houses under the Prior Approval process). We prepare extension plans for properties across all Lewisham postcodes (SE3, SE4, SE6, SE8, SE12, SE13, SE14, SE23, SE26).

Two-storey extensions

The semi-detached and detached housing stock in Lewisham is well suited to two-storey rear extensions, which almost always require planning permission. A two-storey extension can add a larger kitchen-diner at ground floor and an additional bedroom and bathroom above. Lewisham Council generally supports two-storey extensions that are subordinate to the original dwelling, set in from the boundary, and do not result in unacceptable loss of light or privacy to neighbours.

How much do planning drawings cost in Lewisham?

A householder application is £548, a certificate of lawfulness £274. Lewisham withdrew only 3.7% of applications (MHCLG planning statistics, retrieved 1 September 2026), one of the lower rates in London, which suggests schemes here generally get determined rather than pulled — you will get an answer. Our fee is agreed as a fixed sum before the survey, and comes in around 30% under what a London architect charges for the same drawing set.

We include a measured survey, existing and proposed plans, elevations, and a site plan — everything required for a valid planning submission to Lewisham Council. Our fees are 30% below typical London architect rates for the same scope of work.

In Lewisham a Lawful Development Certificate for proposed works does specific work - it keeps a project on the favourable side of the borough's split, recording that the scheme sat within permitted development and never needed the consultation route that refuses most of what reaches it. The council granted 1,221 of them in three years (MHCLG planning statistics, retrieved 1 September 2026).

Our experience in Lewisham

We cover all Lewisham postcodes: SE3, SE4, SE6, SE8, SE12, SE13, SE14, SE23, SE26. Whether your property is in a conservation area, affected by an Article 4 Direction, or in an unrestricted residential street, we have experience with Lewisham Council and understand the borough's planning policies.

Our MCIAT chartered architectural technologists prepare planning drawings and building regulations drawings for residential projects across Lewisham. We handle the full process from initial measured survey through to planning submission, and we liaise with Lewisham Council on your behalf.

We also work in Lewisham's neighbouring boroughs:

What are the odds of approval in Lewisham?

86.3%of householder applications approved in Lewisham

2,037householder decisions in three years

95.3%decided within eight weeks

1,221certificates of lawful development issued

Lewisham sits close to the London average. Of 2,037 householder decisions in the three years to March 2026, 1,757 were approved and 280 refused — 86.3%, against 83.0% London-wide. In practice that means the outcome is decided by the scheme and the drawings rather than by the authority: there is no local bias to plan around, and no local leniency to rely on.

Speed is not the problem here. Lewisham decided 95.3% of householder applications within the statutory eight weeks. If your project has a fixed start date, the determination period is the predictable part of the programme — the variable is how long the drawings take before submission.

The prior-approval route is a poor bet in Lewisham. Of the 305 larger rear extensions determined under the neighbour-consultation scheme, only 4.3% were granted. A neighbour objection is what turns that decision, and in a borough refusing this many it is usually cheaper to design within the ordinary permitted-development envelope, or to make a full application with a proper daylight assessment, than to gamble the £249 fee and eight weeks on prior approval.

The council also issued 1,221 certificates of lawful development in the same three years. That is the route for work that is already permitted development: it is not a permission, it is proof you did not need one, and it costs £274 against the £548 householder application fee.

Source: MHCLG District Planning Application Statistics (PS1 and PS2), the statutory return every English planning authority files. Figures cover the twelve quarters to March 2026 and are decisions made in that window, not applications submitted. Published under the Open Government Licence v3.0.

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