# Basement Construction in Denham

Single-storey, double-storey and lightwell basement excavations under existing London homes. Delivered for Denham (UB9), Home Counties, by HXL Construction under a single JCT contract, coordinated with Buckinghamshire Council.

## Overview
HXL delivers basement construction in Denham and across the wider Home Counties. 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

## Denham: local context
**Property stock.** Denham Village medieval and Georgian listed properties, Denham Garden Village 20th-century detached, post-war and contemporary homes on generous plots around Denham Golf Club.

**Planning and conservation.** Denham Village Conservation Area (one of Buckinghamshire's most tightly controlled). Chilterns AONB at the village edges. Significant listed building coverage. Local planning authority: Buckinghamshire Council.

**Typical scope in Denham:**
- Listed building internal refurbishment
- Village conservation area alterations
- Country home extensions and outbuilding delivery
- Pool house and leisure annexe new build
- Heritage joinery and sash window restoration

## 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 Denham?** Yes. HXL delivers basement construction across Denham (UB9) and the wider Home Counties, as a principal contractor under a single JCT contract.

**Who is the local planning authority for Denham?** Buckinghamshire Council. Denham Village Conservation Area (one of Buckinghamshire's most tightly controlled). Chilterns AONB at the village edges. Significant listed building coverage.

**What properties does HXL work on in Denham?** Denham Village medieval and Georgian listed properties, Denham Garden Village 20th-century detached, post-war and contemporary homes on generous plots around Denham Golf Club.

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

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