Heritage Restoration, Hampstead NW3
Meticulous restoration of a Grade II listed Georgian townhouse on Flask Walk, Hampstead, combining structural stabilisation, sash window restoration, lime plaster renewal and a discreet rear extension under Listed Building Consent. An 18-month programme requiring specialist conservation skills.
Restoring a Georgian Treasure on Flask Walk
Flask Walk is one of Hampstead’s most historically significant streets, and this Grade II listed Georgian townhouse — dating from approximately 1790 — is among its finest surviving examples. The property had suffered from decades of inappropriate maintenance.
Our conservation team prepared a comprehensive scope of works under Listed Building Consent from Camden Council. The guiding principle was reversibility: every intervention should be removable in the future without damaging the original fabric.
The external envelope was painstakingly restored: cement render was removed to reveal Georgian brickwork, which was repointed in lime mortar. All six sash windows were overhauled in our workshop with new cords, weights, draught-proofing and slim-profile secondary glazing.
Internally, modern gypsum plaster was removed to reveal original lime plaster, which was stabilised and finished with three coats of traditional lime. A discreet zinc-clad rear extension provides a modern kitchen that connects to the garden.
Project Timeline
Investigation & Documentation
Detailed photographic and written record. Paint scrapes, mortar analysis and timber condition surveys.
Listed Building Consent
LBC application with method statements. Three rounds of consultation. Approval with 22 conditions.
Specialist Procurement
Sourcing lime putty, heritage glass, reclaimed London stock bricks and specialist contractors.
External Restoration
Cement render removal and repointing. Sash window restoration in workshop. Lead roof strip and re-lay. Chimney repair.
Internal Works
Gypsum removal and lime plaster restoration. Underfloor heating within existing voids. Sympathetic rewire. Bathroom fit-out.
Extension & Kitchen
Single-storey zinc-clad rear extension. Bespoke hand-painted kitchen with natural stone worktops.
Final Finishes & Handover
Limewash to all walls. Heritage colour scheme applied. LBC conditions discharged. Conservation maintenance guide.
What We Delivered
External Envelope Restoration
Cement render removal, lime mortar repointing, lead roof re-lay, chimney repair and external redecoration to English Heritage standards.
Sash Window Overhaul
All six sash windows removed, stripped, repaired with Accoya timber splices, re-corded, draught-proofed and fitted with secondary glazing.
Lime Plaster & Interior Restoration
Removal of incompatible gypsum plaster and restoration of original lime plaster throughout. Limewash finish. Timber panelling conserved.
Discreet Rear Extension
Single-storey zinc-clad kitchen extension in a recessive modern form. Structural glass link separates old and new. Bespoke hand-painted kitchen.
Investment Breakdown
How the project budget was allocated across the major work packages.
Problems We Solved
Cement Removal Risk
Removing cement render from 230-year-old soft brick without damaging the faces beneath.
Steam-assisted removal in small sections with hand tools. Damaged bricks replaced with reclaimed London stock to match.
22 LBC Conditions
Each condition had to be formally discharged before the relevant phase could commence.
Dedicated heritage project manager tracking all 22 conditions on a discharge schedule aligned to construction phases.
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Planning a Similar Project?
Whether you are considering a listed building restoration, heritage renovation or conservation project in Hampstead, Belsize Park or North West London, our specialist team can help.