Haringey Planning Policies for Home Extensions: A Homeowner's Guide

Introduction

The London Borough of Haringey covers a large arc of north London from the inner-city streets of Tottenham and Seven Sisters through to the leafier residential neighbourhoods of Alexandra Palace, Muswell Hill, Crouch End and Hornsey. Haringey's planning framework reflects this diversity — from policies focused on regeneration and intensification in the south to conservation-oriented policies protecting the Victorian and Edwardian character of the north. This guide explains the key planning policies that Haringey applies to householder development.

Haringey Local Plan

Haringey's adopted Local Plan sets the framework for planning decisions in the borough. The Local Plan includes the Site Allocations DPD and various thematic policies covering design, heritage, housing and environment. For householder applications, the most relevant policies address:

• Design quality and local character — requiring extensions to respond to the character of the host building and the surrounding area
• Impact on residential amenity — protecting neighbouring properties from loss of daylight, overshadowing, overlooking and overbearing impact
• Heritage — protecting conservation areas, listed buildings and non-designated heritage assets
• Trees and green infrastructure — protecting significant trees and maintaining the borough's canopy cover

Haringey Residential Design Guidance SPD

Haringey's Supplementary Planning Document on Residential Design Guidance provides detailed design principles for householder development. Key requirements include:

Scale and Proportion

• Extensions should be subordinate to the original dwelling in scale and mass
• Rear dormers should not dominate the roof as seen from public vantage points
• Two-storey rear extensions must demonstrate they do not cause unacceptable overlooking or loss of outlook to neighbouring properties

Materials

• Materials should match or complement the original dwelling — brick colour, bond, mortar and window proportions
• Flat roof extensions should use high-quality materials appropriate to the design — zinc, standing seam metal or good-quality felting
• uPVC is generally not considered appropriate in conservation areas

Neighbour Impact Assessment

• Extensions should not reduce the daylight or sunlight received by neighbouring habitable rooms below BRE acceptable levels
• The 45-degree rule (extension should not project beyond a 45-degree line from the nearest neighbouring window) is used as a guide
• Upper-level windows and terraces should not directly overlook neighbouring gardens at close range

Conservation Areas in Haringey

Haringey has a significant number of conservation areas, particularly in the northern part of the borough. Key conservation areas include:

• Alexandra Palace Conservation Area — covering the streets surrounding Alexandra Palace and Park
• Stroud Green Conservation Area — on the border with Islington, covering Victorian terrace streets
• Crouch End Town Centre Conservation Area
• Muswell Hill Conservation Areas
• Bruce Castle Conservation Area (Tottenham)

In conservation areas, Article 4 Directions may apply, removing some or all permitted development rights. Applications in conservation areas must be supported by heritage statements and design justification that demonstrates compatibility with the character of the area. See our guide to conservation area appraisals.

Permitted Development in Haringey

In non-Article 4 areas of Haringey, standard permitted development rights apply. Single-storey rear extensions of up to 4 metres (detached) or 3 metres (semi or terrace) can typically proceed without planning permission. Loft conversions without rear dormers and outbuildings under certain size limits are also generally permitted development.

The Neighbour Consultation Scheme extends permitted development limits for rear extensions to 8 or 6 metres respectively where neighbours do not object during a 42-day consultation period.

Pre-Application Advice in Haringey

Haringey Council offers a paid pre-application advice service. This is recommended for:

• Applications in or adjacent to conservation areas
• Projects involving listed buildings
• Larger extensions or two-storey additions
• Projects involving trees with TPOs

Pre-application discussions help identify potential issues early, allowing design adjustments before formal application. They can save time and money by avoiding applications that are likely to be refused.

Haringey's Approach to Tree Protection

Haringey has an active tree protection programme. Trees in conservation areas have automatic protection; trees outside conservation areas covered by Tree Preservation Orders require consent before any work is carried out. Trees on the highway are protected under separate legislation. An architect should commission a tree survey at the outset of any project where trees are present on or adjacent to the site.

Conclusion

Haringey's planning framework provides a workable environment for well-designed residential improvements, with detailed guidance available through the Residential Design Guidance SPD. Conservation area designations in the north of the borough require more careful preparation and specialist design input. Working with an architect experienced in Haringey planning applications ensures that your project is properly prepared and has the best possible chance of a successful outcome. For specific advice on your property, a pre-application discussion with Haringey's planning department is often the most efficient first step.