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Guides
All planning guidesRear extension planning permissionLoft conversion PDPD rights explainedPlanning timescalesRefused — what nextArchitect vs technicianConsultant vs architectPlanning permission costHouse extension costDormer vs mansard vs VeluxBuilding regs for loftsConservation areas and Article 4Lawful development certificatesRenovation tradesGarden room planning permissionHMO planning permissionChange of use planning permissionGarage conversion planning permissionSingle storey extension planning permissionDormer loft conversion planning permissionPlanning permission vs building regulations
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Planning permission, explained properly

No jargon, no scare tactics — just what the rules actually say, written by the people who draw plans councils approve every week.

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Single-storey rear extension to a London house, the kind of project this rear extension planning permission guide covers

Rear extension planning permission

Do you need planning permission for a rear extension? Class A limits, the 6m prior approval route, London council depth guides and approval rates by borough.

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Loft conversion bedroom with skylights built without planning permission under Class B permitted development

Loft conversion PD

Do I need planning permission for a loft conversion? Most don't — Class B PD allows 40m³ terraced, 50m³ semi/detached. Dormer and conservation-area rules explained.

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Illustrated drawing package explaining permitted development rights under GPDO Classes A to E for houses

PD rights explained

Permitted development rights explained: what GPDO Classes A–E let you build without planning permission, and what Article 4 and conservation areas take away.

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Aerial view of London boroughs where councils decide how long planning permission takes for householder applications

Planning timescales

How long does planning permission take? Householder applications have an 8-week statutory target from validation. Timeline: consultation, extensions and appeals.

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A carved terracotta arch over a pair of old wooden double doors with the words PUBLIC HALL above, on a Victorian public building

Refused — what next

Planning permission refused? You can usually resubmit a revised scheme free within 12 months, or appeal within 12 weeks. Here's how to choose the right route.

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Architect vs architectural technician comparison — professional preparing planning permission drawings at a drawing board

Architect vs technician

Architect vs architectural technician — what's the difference? ARB architects vs CIAT technologists, who councils accept, and who you need for planning drawings.

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A stone-fronted civic building, Wimbledon Town Hall, behind a row of plane trees with a bus stop and cyclists in front and a supermarket sign over the entrance

Consultant vs architect

Planning consultant vs architect — who do you need? Consultants argue policy and appeals; architects produce the drawings. Most home projects need drawings first.

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A printed planning application notice with a QR code and the words PLANNING APPLICATION, held by a fingertip against a wire fence in a field

Planning permission cost

How much does planning permission cost? The householder fee is £548 from 1 April 2026. Full schedule of council fees, the CIL trap, and what the fee does not cover.

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A terrace of London stock brick houses with white bay windows and low front walls along a street in Ealing, a telegraph pole in the foreground

House extension cost

How much does a house extension cost in London in 2026? Around £3,000–£3,625/m² for a good single-storey rear extension — national rates plus the London premium.

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Scaffolding against the front of a white terraced house with a red rubbish chute and a banner for a loft conversion company

Dormer vs mansard vs Velux

Dormer vs mansard vs Velux loft conversion compared — roof shape, permitted development, headroom and space gained, and which type suits your house.

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Finished attic bedroom loft conversion built to current UK Building Regulations standards

Building regs for lofts

Building Regulations for loft conversions: the Approved Documents that apply — structure, fire, stairs, insulation, electrics — and how building control works.

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Painted stucco terraces in a London conservation area where permitted development rights are restricted and Article 4 directions may apply

Conservation areas and Article 4

How conservation areas and Article 4 directions work in London: which permitted development rights go, how to check your address, and where council counts differ.

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A street of red-brick Edwardian houses with white bay windows, one with a roof window, on Marlborough Road in Exeter, a white van parked on the right

Lawful development certificates

A Lawful Development Certificate proves a project is legal without planning permission. What s.191 and s.192 certificates prove, and the evidence each one needs.

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Three-storey white house in a terrace wrapped in blue-netted scaffolding, with an advert board for a scaffolding firm and a small silver car parked below

Renovation trades

Which trades a London renovation needs, the order they work in, which ones are legally gated, and why the drawings have to be finished before anyone quotes.

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A white-fronted 1930s semi-detached house in North Harrow with a brown up-and-over garage door at its side, a hedge and a large tree in front

Garden room planning permission

Garden room planning permission in London: the 2.5m boundary rule, 4m height cap, designated-land limits and when a garden office needs consent. Free approval check.

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London terraced house converted to shared accommodation, the kind of property that needs an HMO planning check

HMO planning permission

HMO planning permission in London: when a house share needs consent, how Article 4 directions work, the 6 and 7 occupant lines and licence room sizes. Free check.

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Converted commercial building in London, the kind of property that needs a change of use planning permission check

Change of use planning permission

Change of use planning permission in London: which changes need an application, Class MA prior approval, the 90-night short-let rule and Article 4. Free check.

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Converted garage now used as living space, the result of a garage conversion planning permission check in London

Garage conversion planning permission

Garage conversion planning permission in London: when an internal conversion is allowed, the parking-condition trap and building regulations. Free approval check.

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Single storey kitchen extension on a London house, the project where single storey extension planning permission limits apply

Single storey extension planning permission

Single storey extension planning permission in London: depth, height and side-width limits, wraparound traps and prior approval refusal rates. Free check.

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A semi-detached house in East Barnet wrapped in scaffolding and orange sheeting with a red rubbish chute down to a skip, a loft conversion under construction

Dormer loft conversion planning permission

Dormer loft conversion planning permission in London: the Class B limits, the 40 and 50 cubic metre test, set-backs and conservation areas. Free approval check.

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A new-build housing estate of red-brick houses with scaffolding and stacked blocks, seen across a railway line fence

Planning permission vs building regulations

Planning permission vs building regulations: who decides, what each covers, which projects need one, both or neither, and the time limits. Free approval check.

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