Planning Permission in Barnet: 2026 Guide

Planning in Barnet — what you need to know

If you are planning a home improvement project in Barnet, understanding the local planning landscape is essential before you begin. Barnet is managed by London Borough of Barnet, which handles all planning applications, enforcement, and local plan policy for the borough.

Suburban outer-London borough; permitted development used heavily; Hampstead Garden Suburb has its own residents' trust with additional design controls. The borough has a population of approximately 389,000 residents and covers postcodes N2, N3, N10, N11, N12, N14, N20, NW2, NW4, NW7, NW9, NW11, EN4, EN5.

The housing stock in Barnet is predominantly 1930s semi-detached dominates; Edwardian villas in Muswell Hill, Finchley; Garden Suburb Arts & Crafts in Hampstead Garden Suburb; post-war flats in Colindale. This mix of property types means that Barnet 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 20 designated conservation areas and no current Article 4 Directions, Barnet 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 Barnet postcodes. Our MCIAT chartered architectural technologists have experience with Barnet Council and understand the specific policies, design guides, and precedents that apply in Barnet. Our fixed fees start from £840 for our Essentials package and £1,750 for our Complete package — 30% below typical London architect rates.

Article 4 Directions in Barnet

Barnet 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 Barnet 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 (£129) 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 Barnet's 20 conservation areas have additional restrictions on permitted development. We check the specific restrictions affecting your property as part of our initial assessment.

Conservation areas in Barnet

Barnet has 20 designated conservation areas. Notable conservation areas include:

• Hampstead Garden Suburb
• Mill Hill
• Hendon
• Golders Green
• Monken Hadley

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

If your property is in a Barnet conservation area, we can advise on what is achievable and prepare a planning application that addresses the conservation officer's requirements. Our 98% first-time approval rate includes a strong record in conservation area applications.

Popular projects in Barnet

The types of planning applications most commonly submitted in Barnet are shaped by the borough's housing stock. 1930s semi-detached dominates; Edwardian villas in Muswell Hill, Finchley; Garden Suburb Arts & Crafts in Hampstead Garden Suburb; post-war flats in Colindale, which drives demand for specific types of extensions and conversions.

Two-storey extensions

The semi-detached and detached housing stock in Barnet 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. Barnet 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. Our Complete package from £1,750 covers full planning and building regulations drawings.

Flat conversions and internal alterations

With mansion blocks and converted flats forming part of Barnet's housing stock, internal layout changes and flat conversions are common projects. While internal alterations rarely need planning permission, converting a house to flats (C3 to C4 HMO) or vice versa may require planning approval. We can prepare the necessary floor plans, elevations, and supporting documents for flat conversion applications in Barnet.

How much do planning drawings cost in Barnet?

The cost of a planning application in Barnet has two components: the council application fee and the professional drawing fees.

Our fixed-fee pricing means you know the cost upfront with no hourly billing surprises. We include a measured survey, existing and proposed plans, elevations, and a site plan — everything required for a valid planning submission to Barnet Council. Our fees are 30% below typical London architect rates for the same scope of work.

For Permitted Development projects that do not require a planning application, we recommend obtaining a Lawful Development Certificate (£129 council fee). This provides formal legal confirmation that your project is lawful and prevents problems when selling the property. We prepare the LDC drawings and application on your behalf.

Our experience in Barnet

We cover all Barnet postcodes: N2, N3, N10, N11, N12, N14, N20, NW2, NW4, NW7, NW9, NW11, EN4, EN5. Whether your property is in a conservation area, affected by an Article 4 Direction, or in an unrestricted residential street, we have experience with Barnet Council and understand the borough's planning policies.

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

We also work in Barnet's neighbouring boroughs:

Frequently asked questions