# Basement Construction in Hampstead

Single-storey, double-storey and lightwell basement excavations under existing London homes. Delivered for Hampstead (NW3), London, by HXL Construction under a single JCT contract, coordinated with London Borough of Camden.

## Overview
HXL delivers basement construction in Hampstead and across the wider London. Basement construction under existing London townhouses, semi-detached and detached homes is high-margin, technically demanding work that HXL routinely delivers. Single-storey excavations under footprint, double-storey schemes, lightwell and sub-pavement vault construction in conservation-area streets. All schemes include temporary-works design, structural propping, BS 8102-compliant waterproofing, and party wall coordination across all affected neighbours.

## Capability
- Single-storey basement excavation under existing footprint
- Double-storey basement schemes
- Lightwell and sub-pavement vault construction
- Temporary works and propping design
- BS 8102 Type C cavity-drainage waterproofing
- BS 8102 Type A and Type B tanked waterproofing
- Underpinning to existing foundations
- Party wall award coordination across all neighbours

## Hampstead: local context
**Property stock.** Georgian townhouses, Victorian semis, Edwardian detached homes, Arts-and-Crafts family homes. Significant proportion within Hampstead Conservation Area and within view of Hampstead Heath.

**Planning and conservation.** Hampstead Conservation Area (Camden). Article 4 directions restrict certain permitted-development rights. Many homes listed Grade II or Grade II*. Local planning authority: London Borough of Camden.

**Typical scope in Hampstead:**
- Whole-house refurbishment of Victorian semis
- Double-storey rear and side-return extensions
- Basement excavations under existing footprint
- Loft conversions (mansard or dormer, subject to planning)
- Façade retention on heritage properties

## Process
01. **Survey & design** — Ground investigation, structural engineering design, party wall service, planning consent where the scheme falls outside permitted development.
02. **Excavation** — Underpin, install temporary works, excavate, remove spoil, construct retaining walls.
03. **Waterproofing & fit-out** — BS 8102 system installation, M&E first fix, plant install, second fix and finishes.
04. **Sign-off** — Structural sign-off, Building Control completion, waterproofing system warranty, 12-month workmanship warranty.

## FAQ
**Does HXL carry out basement construction in Hampstead?** Yes. HXL delivers basement construction across Hampstead (NW3) and the wider London, as a principal contractor under a single JCT contract.

**Who is the local planning authority for Hampstead?** London Borough of Camden. Hampstead Conservation Area (Camden). Article 4 directions restrict certain permitted-development rights. Many homes listed Grade II or Grade II*.

**What properties does HXL work on in Hampstead?** Georgian townhouses, Victorian semis, Edwardian detached homes, Arts-and-Crafts family homes. Significant proportion within Hampstead Conservation Area and within view of Hampstead Heath.

## Related
- Basement Construction (overview): https://hxlconstruction.co.uk/services/basement-construction
- Construction in Hampstead: https://hxlconstruction.co.uk/areas/hampstead

Contact: info@hxlconstruction.com · +44 7845 585147 · HXL Construction Ltd, 102 Vine Lane, Uxbridge, London UB10 0BE