Planning Permission in Streatham SW16
Fixed-fee, MCIAT-chartered planning permission for Streatham (SW16) homeowners — London Borough of Lambeth validation and local constraints handled from the start.
Streatham (SW16) is a long, mixed Lambeth neighbourhood that runs from the terraces off the High Road out to the interwar semis of Streatham Vale. The most consistent control is the Streatham Common conservation area, which governs roof form, materials and frontages for houses around the Common — a very different context from the standard terraces further north where side-return and loft projects follow the usual pattern.
Because the housing grain shifts from terrace to semi across the district, the right extension approach genuinely varies street to street. We establish where a Streatham property sits relative to the Common conservation area and the High Road frontage, then prepare the drawings to Lambeth's residential design and validation standards.
Planning in Streatham (SW16): what to know before you apply
SW16 has no householder Article 4 direction, so many Streatham houses retain permitted development rights — but the Streatham Common conservation area is the exception, and the interwar semis toward Streatham Vale carry different design expectations from the Victorian terraces nearer the High Road.
Typical Streatham housing stock
Victorian and Edwardian terraces on the streets off Streatham High Road, interwar semi-detached houses toward Streatham Vale and Norbury, and mansion blocks along the High Road and around the Common.
Streets we regularly draw for in Streatham
Streatham High Road · Mitcham Lane · Leigham Court Road · Streatham Common North
What SW16 is actually built of
Measured from 471 classified residential buildings in SW16, not from a description of the area.
Streatham SW16 housing mix
Residential building form across the SW16 postcode district, from 471 classified buildings.
| Attached on more than one side | 53% |
|---|---|
| Attached on one side | 38% |
| Detached | 9% |
| Median building footprint | 69 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.68 |
| Buildings classified | 471 |
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.
Planning Permission for Streatham (SW16) homes: the package and the process
A householder application is refused validation far more often than it is refused permission, and almost always for the same reasons: a location plan at the wrong scale, no red line around the application site, a missing ownership certificate, or elevations that do not show every face of the building affected. We prepare the full submission set — location plan, block plan, existing and proposed floor plans, elevations and sections — so the case officer receives a complete case on day one.
Once the application is live we stay on it. Officers routinely come back with questions about materials, boundary treatment or a dimension they cannot read off the drawings, and a fast, drawn answer is usually the difference between a decision inside the statutory period and a request to withdraw and resubmit.
Which route applies is decided by the building before it is decided by policy. A house that has never been extended usually has allowances left to use; a flat, a listed building or a home in a conservation area often has none, and the same drawing set then has to make a design case rather than a compliance one.
Do I need planning permission for an extension in London?
Many single-storey rear extensions, loft conversions and outbuildings fall under permitted development rights and do not need a full planning application — but London's dense housing stock, conservation areas and Article 4 directions frequently withdraw those rights. Before you pay for a full application, we check your property against the current permitted development thresholds and your borough's local constraints.
Where permitted development applies, we recommend a Lawful Development Certificate instead of full planning — it is faster, cheaper and gives you a legal document confirming the work was lawful. Where a full application is genuinely required, we prepare it properly the first time.
Permitted development vs a full planning application
Permitted development lets you build within defined volumetric limits without committee review. A full householder application is assessed against the borough's local plan for scale, daylight, neighbour impact and design. We advise which route your project qualifies for and why.
Article 4 directions and conservation areas
If your home sits in a conservation area or under an Article 4 direction, permitted development rights are often removed — meaning even modest changes need consent. Each borough page lists the local directions and conservation areas we routinely design around.
How do you apply for planning permission through the London Planning Portal?
We manage the full lifecycle of your submission — survey, drawings, supporting documents and officer liaison — so you never have to decode a validation checklist yourself.
Phase 1 — existing and proposed site surveys
A laser-measured survey captures your property exactly, so existing and proposed drawings match reality millimetre for millimetre.
Phase 2 — technical drawing package
Site location plan, block plan, floor plans, elevations and sections drawn to your borough's scale and formatting requirements, with a design and access statement where needed.
Phase 3 — liaison with the planning officer
We answer the council's queries, negotiate amendments, and redraw free until the decision lands.
How long does planning permission take, and what does it cost?
Drawings are typically ready within 7 days of survey. Your council then has a statutory 8 weeks to decide a householder application. Our drawing fees are fixed and quoted upfront — the table below shows typical packages.
| Package | Production window | Compliance layer | Typical fee |
|---|---|---|---|
| Permitted Development pack | 7–10 working days | Lawful Development Certificate submission | £950–£1,450 |
| Full Planning pack | 10–14 working days | Council liaison & design statement | £1,600–£2,400 |
| Planning + Building Regs pack | 14–21 working days | Structural calculations included | £2,200–£3,850 |
Planning Permission in Streatham SW16 — FAQs
How long does it take to get planning permission from a London council?+
What happens if the council refuses?+
Do you cover my borough?+
Is the fee really fixed?+
Do I need planning permission for a side-return extension in Lambeth?+
My Lambeth home is a converted flat — does that change things?+
What does Lambeth's HMO Article 4 direction affect?+
How long does Lambeth Council take to decide?+
How much do planning drawings cost in Lambeth?+
Get your free Streatham planning assessment
Tell us your Streatham (SW16) address and ambition — we'll confirm feasibility, local constraints and a fixed fee within one working day.