Grosvenor Avenue, Highbury N5

A rear extension to an Edwardian terrace in Highbury: a new kitchen and dining space with underfloor heating, taken through Islington planning with drainage modifications the planners asked for, and a party wall agreement on one side.

Project facts

• HouseEdwardian terrace
• Added+500 sq ft
• On site13 weeks
• Completed2021
• PlanningHouseholder planning (Islington)
• Contract value£250,000 – £350,000 inc. VAT

Project type: Rear extension · Area: Highbury / Islington N5

What we did

• Single-storey rear extension
• New kitchen and dining space
• Underfloor heating
• Islington planning application incl. drainage changes
• Party wall agreement on one side

Specification

Kitchen · Underfloor heating

Design and build inclusive: architecture, structural engineering, planning, party wall, construction, project management and LABC sign-off under one contract.

How design and build works

Anderson's note

Islington rarely engages on pre-application, so we went in with a well-argued application and precedent cases from the same street. The drainage modification the planners wanted was turned round in days rather than losing a planning cycle.

Anderson, founder — LCCL Construction, Finchley N3

The client's view

“Alexander and his architect and structural engineer produced the drawings for our extension and got them through planning efficiently, dealing with some drainage modifications required by the planners very quickly. They're also sorting out a party wall agreement for us on one side. Alexander has been very helpful and accommodating of our budget needs.”

Verified client · Trustpilot

As LABC Building Excellence Award Winners 2024 for Best Residential Extension in London, and 2026 London Regional Winners for Best Conversion or Alteration, every project runs under one contract with a 12-month workmanship guarantee and a 10-year LABC structural warranty.

One team, one contract, one point of contact — from first sketch to handover.