Structural engineer in Enfield

Structural engineering in Enfield

Enfield is London's most northerly borough, taking in Southgate (N14), Winchmore Hill (N21), Palmers Green (N13), Edmonton (N9, N18), Enfield Town (EN1, EN2), Enfield Highway and Ponders End (EN3), and New Southgate (N11). We have carried out 34 projects in Enfield since 2019, from extensions and lofts to new development on back-land sites. The borough changes a great deal from west to east, in both its housing and its ground, and that shapes the engineering on every job.

Our Winchmore Hill project is a good example of back-land development in the borough: a new development on land behind an electricity substation, with foundations designed from a geotechnical ground investigation rather than assumptions. Enfield has many sites like this, and getting reliable ground information early avoids redesign once work starts. It also gives Building Control the evidence it needs to accept the foundation design without delay.

Edwardian Palmers Green, interwar Southgate and Edmonton terraces

Palmers Green, Winchmore Hill and Bowes Park have streets of Edwardian terraces and semis with generous rear outriggers and loft potential. Southgate, Grange Park and much of Enfield Town were built between the wars, with semis and detached houses on larger plots. Older village centres survive at Winchmore Hill, Enfield Town and Forty Hill.

Edmonton, Ponders End and Enfield Highway have Victorian and Edwardian terraces, interwar council housing and post-war estates, with more conversions and HMOs. Long gardens in the west of the borough create opportunities for back-land homes, which need structural and civil engineering together.

Clay in the west, Lea Valley gravels in the east

The west and centre of Enfield sit mainly on London Clay, with higher ground toward Enfield Chase where sandy and gravelly deposits can cap the clay. Mature trees and hedges are everywhere, and clay shrinkage commonly moves foundations in N13, N14 and N21. Streams such as Salmons Brook and Pymmes Brook have alluvium along their valleys.

The east lies in the Lea Valley, on river terrace gravels and alluvium, with shallow groundwater and flood zones near the river. Former industrial land in Edmonton and Ponders End can contain made ground. A ground investigation and factual report is often worthwhile before any new build.

Common structural jobs in Enfield

Enfield gives a mix of domestic extension work in the west and conversion and repair work in the east, with small new-build schemes throughout. Many jobs involve both structure and drainage, particularly back-land homes and extensions over public sewers.

• Dormer lofts on Southgate and Grange Park semis
• Rear extensions on Palmers Green terraces
• Back-land and garden plot new builds
• Foundations designed from ground investigations
• Edmonton houses converted into flats and HMOs
• Drainage designs for sewer connections

Enfield Council, the Green Belt and building near sewers

Enfield has conservation areas including Winchmore Hill Green, Enfield Town, Forty Hill and parts of Southgate, and a large area of Green Belt in the north. Enfield Council will confirm whether your property is affected and what its policies say about garden and back-land development.

Building Control approval is needed for all structural work, and party wall notices apply to most lofts and extensions on semis and terraces. If an extension is near a public sewer, Thames Water's agreement is needed; our guide to building over sewers explains the process.