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Service area · London Borough of Islington

Architectural Designers in Islington

Magna Studio prepares planning and Building Regulations drawings for homeowners across the London Borough of Islington, one of the densest and most heavily designated boroughs in London. Our typical Islington projects are rear and side-return extensions to Georgian and Victorian terraces in Barnsbury, Canonbury and Highbury, mansard and dormer lofts in Holloway and Archway, and basements under larger houses. We also handle Class MA conversions along Upper Street and Holloway Road. Every quote is a fixed fee agreed in writing before we start.

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Planning authority
Islington
Decision time
8 weeks statutory
Common work
Rear extension
Quote
Within 24 hours
01Local context

Typical homes we work on in Islington

  • Georgian and early Victorian terraces and squares in Barnsbury, Canonbury and Clerkenwell
  • Victorian terraces in Highbury, Holloway, Tufnell Park and Archway
  • Edwardian houses and mansion blocks around Highbury Fields and Tufnell Park
  • 1930s and post-war council estates across Holloway, Finsbury and Archway
  • Converted houses and purpose-built flats throughout the borough, where flats have no PD rights
  • Warehouse conversions and new apartment schemes in Clerkenwell, Finsbury and King's Cross
02Constraints

Planning constraints in Islington

What changes the planning route in this area. Always confirm on the council's constraints map before relying on permitted development.

Conservation areas

Around 40 conservation areas cover roughly half of Islington, including Barnsbury, Canonbury, Highbury Fields, Clerkenwell Green, Tufnell Park and Hillrise. Roof extensions and cladding in these areas need planning permission rather than permitted development. Check the council's constraints map for your address before assuming PD applies.

Source · Checked 15 Sept 2026

Article 4 directions

Islington has a Class MA Article 4 direction covering the Central Activities Zone and its town centres, removing the commercial-to-residential prior approval route there, and Article 4 directions in several conservation areas removing permitted development for front alterations. We confirm coverage for your address with the council.

Source · Checked 15 Sept 2026

Urban Design Guide

Islington's Urban Design Guide supplementary planning document sets out detailed expectations for rear extensions, roof extensions, dormers, basements and materials on the borough's terraces. Officers refer to it in almost every householder decision, so we design and check against it before submission.

Source · Checked 15 Sept 2026

Basement Development SPD

Islington has a Basement Development supplementary planning document limiting basements to a single storey beneath the footprint and part of the garden, and requiring structural, drainage and construction management information. Basements under Barnsbury and Canonbury houses are common but need a fuller application than a rear extension.

Source · Checked 15 Sept 2026

Listed buildings

Barnsbury, Canonbury, Clerkenwell and the Georgian squares contain many listed terraces. Listed houses need listed building consent for almost any alteration, internal or external, and extensions to neighbours are judged on their effect on the setting of the listed terrace.

Checked 15 Sept 2026

Flats and maisonettes

A large majority of Islington homes are flats, including most converted Georgian and Victorian houses. Flats have no householder permitted development rights, so every extension, roof alteration or outbuilding to a flat needs planning permission, and usually the freeholder's consent too.

Checked 15 Sept 2026

What London Borough of Islington planning officers look for

Islington is one of the stricter London authorities on householder design and applies the Urban Design Guide closely. Rear extensions are generally expected to be single storey and no deeper than 3 m on terraces, side returns must keep parapets low against the neighbour's garden and roof extensions in conservation areas are frequently refused unless they follow an established pattern on the terrace. Mansards are accepted where the terrace already has them; front dormers are not. Pre-application advice is available for a fee and, in our experience, is worth using for anything in Barnsbury or Canonbury and for all basements.

Council links

Extensions and loft conversions in Islington

Islington is small, dense and almost entirely Georgian and Victorian. Barnsbury, Canonbury, Highbury and Clerkenwell are set-piece terraces and squares; Holloway, Tufnell Park and Archway are later Victorian streets, many converted to flats; and post-war estates fill the gaps. The typical brief is a rear or side-return extension to open up a terrace kitchen, a mansard or rear dormer for a top-floor bedroom, a basement under a larger house, or the reworking of a converted flat.

Two facts shape almost every Islington project. First, most homes are flats, which have no permitted development rights. Second, around half the borough is conservation area. Together they mean the great majority of our Islington work goes through full planning applications, judged against the council’s Urban Design Guide.

Planning constraints in Islington

The designations that most often shape an Islington project are:

  • Conservation areas (around 40, covering roughly half the borough) at Barnsbury, Canonbury, Highbury Fields, Clerkenwell, Tufnell Park and elsewhere, removing PD for roof extensions.
  • Article 4 directions, including a Class MA Article 4 across the Central Activities Zone and town centres, and conservation-area directions on front alterations.
  • The Urban Design Guide SPD, which sets detailed expectations for extensions, roofs and materials.
  • The Basement Development SPD, limiting basements to a single storey with full technical information.
  • Listed buildings throughout the Georgian squares and terraces.
  • Flats and maisonettes, which have no householder PD rights.

If you are not sure whether your home is a house or a flat in planning terms, we check the title and planning history before advising.

What Islington planning officers look for

Islington’s officers are among the more exacting in London. For rear extensions they generally expect single storey, no more than about 3 m deep on a terrace, with parapets kept low against the neighbour’s garden and the 45-degree rule respected. For roofs they favour mansards on terraces where the pattern already exists, set behind the parapet with a 70-degree front slope; rear dormers are accepted where the terrace has them, front dormers are not.

Materials should match the host building closely: London stock brick, timber sash windows, natural slate. For basements they check structural method, drainage and construction impact as well as garden take. Pre-application advice is available for a fee and we recommend it for anything in Barnsbury or Canonbury and for all basements.

Our services in Islington

Example projects nearby

Guides

Read our guides on extending or converting a loft in a conservation area and householder planning applications in London.

Ready to start in Islington? Get an instant estimate: your indicative fee on screen and by email in two minutes, then a written fixed-fee quote within 24 hours.

03Examples

Example projects in and around Islington

Proposed ground floor plan of a 3.5 m deep rear extension to a Victorian terrace in Highbury, IslingtonExample project
Rear extensionHighbury, Islington

Rear Extension in Highbury, Islington

Full-width single-storey rear extension, 3.5 m deep with three rooflights, to a Victorian terrace in a Highbury conservation area, creating an open kitchen and dining room.

Typical route: Householder planning application in a conservation area

Proposed loft floor plan for an L-shaped rear dormer loft conversion on a Victorian terrace in HackneyExample project
Loft conversionStoke Newington, Hackney

Loft Conversion in Stoke Newington, Hackney

L-shaped rear dormer loft conversion to a two-storey Victorian terrace, adding a double bedroom and en-suite within the 40 m³ permitted development allowance.

Typical route: Permitted development, proved with a Lawful Development Certificate

Proposed ground floor plan of a wraparound side-return and rear extension to a Victorian terrace in Kentish TownExample project
Wraparound extensionKentish Town, Camden

Wraparound Extension in Kentish Town, Camden

Side-return infill and 3 m rear extension forming a wraparound kitchen-dining room on a Victorian terrace in a Kentish Town conservation area, with steelwork bearing on both party walls.

Typical route: Pre-application advice, then a householder planning application

04Questions

Planning questions we hear in Islington

Do I need planning permission for a rear extension in Islington?

Usually yes. Most Islington homes are flats, which have no permitted development rights, and most houses sit in conservation areas where Article 4 directions and roof restrictions apply. A freehold house outside a conservation area can use the 3 m Class A allowance, but that is the exception. We check tenure and constraints for your address before recommending a route.

Can I convert my loft under permitted development in Islington?

Only if you own a freehold house outside a conservation area, within the 40 m³ allowance for a terrace and with no dormer facing the road. That describes a minority of Islington homes. In conservation areas roof extensions need planning permission and are judged against the Urban Design Guide, which favours mansards on terraces where the pattern already exists.

Are there Article 4 directions in Islington?

Yes. A Class MA Article 4 covers the Central Activities Zone and Islington's town centres, removing the commercial-to-residential prior approval route there, and several conservation areas carry Article 4 directions removing permitted development for front alterations. Coverage varies, so we confirm with the council for your address.

How long does Islington council take to decide a householder application?

The statutory period is 8 weeks from validation for a householder application or a Lawful Development Certificate, and 42 days for a larger home extension prior approval. Islington is a busy authority and decisions can run past the statutory period, so we build that into the programme. The council fee is £528 for a householder application (verify before applying).

Can I dig a basement under my Islington house?

Often yes, but it always needs planning permission and Islington's Basement Development SPD limits basements to a single storey and asks for structural, drainage and construction management information alongside the drawings. Listed houses need listed building consent too. We coordinate the structural engineer's input so the application is complete on submission.

05Coverage

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