Basement Conversions in Islington, N1
Cellar and basement conversions in Islington: dry, habitable rooms below ground with designed waterproofing, natural light and building control approval.
Covered under one contract
- Structural design and calculations
- Planning or lawful development certificate
- New staircase, dormer and roof windows
- Insulation, fire safety and building control
- En-suite designed and fitted
- Waterproofing with guarantee for basements
Basement Conversions in Islington.
Where a house cannot grow outwards or upwards, it can grow downwards. Many of the older houses in Islington already have a cellar or vaults, and converting them into a usable floor is a well-established route to a utility room, guest suite, study or cinema room.
The two things that decide whether a basement works are waterproofing and light. We use a designed system, normally a cavity drainage membrane with a sump and pump, which carries a guarantee, and we bring light in through a lightwell or a rear opening where the site allows. Ceiling height, drainage and structure are all surveyed at the outset.
Converting an existing cellar without changing the exterior of the house does not usually need planning permission. Lightwells, listed buildings and new excavation do, and the central London boroughs have their own basement policies with impact assessments. All basements need building regulations approval and most involve party wall notices, which we prepare and serve.
- Area
- Islington, N1
- Council
- London Borough of Islington
- Housing
- Georgian and early Victorian terraces and squares in Barnsbury and Canonbury, Highbury villas, converted warehouses and new apartments near the canal
- Transport
- Angel, Highbury & Islington, Essex Road
- Basement, existing cellar
- 10 to 16 weeks
- Consent
- Often permitted development for lofts
- Waterproofing
- Guaranteed system, designed for the site
Islington: the houses and the planning rules.
Islington is Georgian and early Victorian London north of the Angel: flat-fronted brick terraces around the squares of Barnsbury and Canonbury, the grander villas of Highbury Fields, and the canal-side warehouses now converted to apartments. The conservation areas are extensive and many houses are listed.
We have refurbished houses in Highbury and the surrounding streets, and the pattern here is consistent: opening up a narrow terraced plan, adding a side or rear extension at lower ground level, converting the loft and restoring the front elevation. Islington's conservation team expects rear extensions to be subordinate and well detailed.
The Barnsbury, Canonbury, Highbury Fields and Duncan Terrace/Colebrooke Row conservation areas cover most of the district.
London Borough of Islington
Islington decides applications and applies Article 4 directions in most conservation areas, so rear extensions and roof changes generally need a full application.
Basements
The borough's basement policy limits depth and footprint and requires a structural method statement and impact assessment.
Listed terraces
Many terraces are Grade II listed; internal alterations, including removing walls, need listed building consent.
Approvals for basement conversions in Islington.
Converting an existing cellar without altering the exterior does not usually need planning permission; lightwells, listed buildings and new excavation do. Every basement needs building regulations approval and a designed waterproofing system, and most involve party wall notices.
Islington decides applications and applies Article 4 directions in most conservation areas, so rear extensions and roof changes generally need a full application.
What basement conversions in Islington includes.
- Structural design and calculations
- Planning or lawful development certificate
- New staircase, dormer and roof windows
- Insulation, fire safety and building control
- En-suite designed and fitted
- Waterproofing with guarantee for basements
From site visit to handover.
- 01
Site visit & consultation
We visit, listen and measure. Brief, budget and constraints understood before any advice is given.
- 02
Design & itemised quote
Our architects and engineers draw the scheme, and from that we provide a transparent, itemised quotation for your approval.
- 03
Planning & approvals
Planning applications, building control and party wall matters handled for you.
- 04
Build, managed weekly
Our own trades, sequenced by a site manager. Progress reported every week.
- 05
Handover & aftercare
Joint snagging walk-through, documentation, and a guarantee on our workmanship.
Basement Conversions in Islington: your questions.
Can I convert a cellar in Islington?
Usually. Converting an existing cellar without changing the outside of the house does not normally need planning permission. Lightwells, listed buildings and new excavation do, and every basement needs building regulations approval.
How do you keep a converted basement dry?
With a designed waterproofing system, typically a cavity drainage membrane with a sump and pump, or tanking where appropriate. It carries a guarantee and is designed for the ground conditions found on site.
Which parts of Islington do you cover?
All of Islington and N1, including Gibson Square, Canonbury Square, Highbury Fields, Thornhill Road, Colebrooke Row, Liverpool Road, and the neighbouring districts. We are based in London and our teams work across central, north, north-west, west and south-west London.
Our work near Islington.
Other services in Islington.
House Refurbishment in Islington
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Flat Refurbishment in Islington
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House Extensions in Islington
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Structural Alterations in Islington
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Loft Conversions in Islington
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Kitchen Renovation in Islington
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Bathroom Renovation in Islington
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Bespoke Joinery & Fitted Furniture in Islington
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Architectural & Interior Design in Islington
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Planning Permission & Building Regulations in Islington
Read moreBasement Conversions across London.
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We will visit, listen and explain what is possible for your property and how it would be approved. No pressure, no sales pitch.