House
extensions
in Highbury, N5
Architects, Engineers, Surveyors & Builders Under One Roof.
One Studio. One Contract. One Team.
Hampstead Chartered Surveyors & Building ConsultancyPlan a Highbury kitchen, dining or garden-room extension around the back of the house as it stands, the garden you want to keep and the limits any conservation guideline sets on height, width and side additions. Bring your plans, photographs of the rear and garden, and a list of what the extra space must do to a conversation with Hampstead Renovations.
A considered approach to house extensions in Highbury
Planning a house extension in Highbury
Each Highbury conservation guideline sets its own limits on rear and side additions, and several allow side extensions only at the properties they list. Read the guideline for the street and the planning history of the house before fixing a footprint.
The standard rear-extension rule
Highbury Fields guidance does not normally permit full-width rear extensions above one storey, or half-width ones above two, unless shown to cause no harm; Aberdeen Park follows that rule, and Calabria Road does not normally allow rear extensions above one storey at garden level.
- Highbury Fields conservation area design guidelines (CA5), January 2002
- Aberdeen Park conservation area design guidelines (CA27), January 2002
- Calabria Road conservation area design guidelines (CA38), June 2003
Side extensions only where scheduled
The Highbury Fields guidelines consider single-storey side extensions only at Schedule 5.6 properties. Highbury New Park limits them to the house numbers its guidelines list, at one storey and at least 2 m behind the front corner; Calabria Road does not normally allow them.
- Highbury Fields conservation area design guidelines (CA5), January 2002
- Highbury New Park conservation area design guidelines (CA15), January 2002
- Calabria Road conservation area design guidelines (CA38), June 2003
From the initial brief to a coordinated project
Define the brief and constraints
Develop and test the design
Plan construction around the home
Inspect, review and document
What to bring to your first conversation
- The address, existing plans and photographs of the rear, side, garden and neighbouring relationship.
- The intended room use, priorities for retained outdoor space and any known drainage or tree constraints.
- Available planning history, ownership or lease documents, access arrangements and occupation requirements.
Include the joinery in the design brief
Explore bespoke joineryHouse extensions: practical questions
Does every house extension require a planning application?
No. Some qualify for permitted development, but eligibility depends on the building, proposal and restrictions. Conservation-area rules treat side and multi-storey rear extensions differently from some single-storey rear work. Flats do not have Part 1 householder rights.
- GOV.UK: householder permitted development technical guidance
Is planning permission the same as Building Regulations approval?
No. Building Regulations cover construction and extension work, while planning addresses whether development is acceptable. The project may need both, alongside any separate listed-building, lease or private consent.
- GOV.UK: building regulations approval
- Historic England: listed building consent
- LEASE: alterations and home improvements
Will Party Wall procedures apply?
They may apply to work on a party structure, boundary building or qualifying excavation near a neighbour’s foundations. Assess the proposed work rather than assuming every extension needs an award. Minor drilling for shelves or cabinets is a different matter.
- GOV.UK: notifiable party-wall work
Can work to a listed house be treated like an ordinary extension?
The effect on its special architectural or historic interest must be assessed. Listed-building consent can be relevant to internal alterations as well as the addition, and should be considered before significant fabric is changed.
- Historic England: listed building consent
Can a Poets Road terrace have a side-return infill?
The October 2025 management plan expects rear extensions and side-return infills to be single storey and rules out new terraces or balconies at first floor or above. Householder permitted development excludes side extensions in a conservation area, so check how the infill would be classed and allow for a planning application.
- Poets Road conservation area management plan, October 2025
- GPDO 2015, Schedule 2 Part 1: householder permitted development
Which Aberdeen Park houses can have a side extension?
Only the numbers listed in the Aberdeen Park guidelines, and then only as a rebuilt single-storey side extension. Rear extensions follow the standard rule, and because the road is private, agree access for deliveries, skips and storage with those responsible for it before construction is planned.
- Aberdeen Park conservation area design guidelines (CA27), January 2002
Why Hampstead Renovations
Guides & Local Reading
More Services in Highbury
The local building context
Islington’s Highbury Fields guidelines describe Georgian terraces, Victorian villas north of the Fields from Highbury Hill to Aubert Park, and Highbury Barn with its clock tower. Brick and render, timber windows and doors and slate roofs carry the character, and most houses have front basement areas behind cast-iron railings. Historic England lists 16–24 Highbury Place, terraced houses of 1773–4 by John Spiller, at Grade II.
Highbury New Park, its guidelines record, was laid out in the 1850s as a wide, curving road of grand detached and semi-detached houses, nearly all with visible pitched slate roofs, mostly hipped; 2–8 Beresford Terrace, including 66 Highbury New Park, dates from 1856 and is listed Grade II. Aberdeen Park, a private road, is an 1850s estate of large villas, several Italianate, in big gardens around the Grade I former St Saviour’s Church of 1865–66 by William White.
Highbury describes where we work, not a planning boundary. Find the council for the full address, then check Islington’s conservation-area map, any list entry, the Article 4 position and the planning history for the property. An N5 postcode or a familiar street name cannot settle the council, the conservation boundary or the consent route.
- Highbury Fields conservation area design guidelines (CA5), January 2002
- Historic England list entry 1207440: 16–24 Highbury Place
- Highbury New Park conservation area design guidelines (CA15), January 2002
- Historic England list entry 1195478: 2–8 Beresford Terrace
- Aberdeen Park conservation area design guidelines (CA27), January 2002
- Historic England list entry 1195443: former Church of St Saviour, Aberdeen Park
- Find the council for the property
- Islington conservation areas, designation dates and design guidelines
- Islington listed buildings and listed building consent
- Islington permitted development and Article 4 directions
Local design and consent context
Islington’s published design guidelines for Highbury Fields (CA5, designated 7 January 1969 and amended 5 February 1990), Highbury New Park (CA15, designated 11 February 1975 and amended 6 November 2002) and Aberdeen Park (CA27, designated 5 February 1990) are dated January 2002; Calabria Road (CA38, designated 14 October 2002) has guidelines dated June 2003. Highbury Hill falls within Highbury Fields rather than forming an area of its own.
Poets Road (CA42), designated in 2025, has an appraisal and a management plan dated October 2025 for an area taking in Poets, Ferntower, Pyrland, Beresford and Leconfield Roads, Petherton Road and Grosvenor Avenue. The older guidelines cite documents that have since been superseded, but the council still lists them as current; read them alongside the adopted Local Plan.
The January 2016 Basement Development SPD is still published. For conservation areas it asks you to avoid clutter such as railings, rooflights, lightwells and staircases, to protect gardens, garden levels and trees, and to keep rooflights and lightwells close to the original building. The Poets Road appraisal records naturally high groundwater, so ground investigation should come before any basement design there.
- Islington conservation areas, designation dates and design guidelines
- Highbury Fields conservation area design guidelines (CA5), January 2002
- Highbury New Park conservation area design guidelines (CA15), January 2002
- Aberdeen Park conservation area design guidelines (CA27), January 2002
- Calabria Road conservation area design guidelines (CA38), June 2003
- Poets Road conservation area appraisal, October 2025
- Poets Road conservation area management plan, October 2025
- Islington Local Plan, adopted 28 September 2023
- Islington Basement Development SPD, January 2016
- Islington basement development guidance
Access and site planning
Only a company holding a waste carrier licence can apply for a skip licence on the highway, and near the Emirates Stadium skips must be cleared before matches and events. Scaffolding, hoardings, materials and containers need highway licences, while Holloway Road is a red route handled by TfL. Apply for bay suspensions at least 14 days ahead, allow for match-day parking controls and suspended bays, and settle access separately on Aberdeen Park, a private road.
Book a feasibility visit
Consultation
We survey your property, discuss your vision and provide a clear budget framework.
Completed renovation project examples
