Basement impact assessment in Redbridge

Redbridge houses, gardens and green belt

Houses dominate the housing stock here: 66.2 per cent of households live in one and 57.1 per cent own their home. Domestic gardens cover 27.4 per cent of the land in the national land-use database, and 34 per cent of the borough is covered by green-belt polygons.

That combination makes rear-garden schemes realistic, and the garden-depth limit is what defines the possible footprint. On the green-belt edge the question is different, because new buildings and structures there are controlled more tightly; we check the plot against the map before we sketch a basement.

Soil cover is the quiet requirement. A metre of permeable soil above any basement under a garden means the roof slab sits lower than you might expect, so the whole box goes deeper, which affects cost, groundwater and the neighbours.

A front basement or lightwell is a separate case, since the front limit is lower. We advise against a deep front excavation unless the plan clearly allows it, because it affects the drive, the street trees and the neighbour's forecourt.

Heritage in Redbridge

Heritage is lighter than in inner London. The borough has 16 conservation areas and 134 listed building entries, including 1 at Grade I and 3 registered parks and gardens. Where your house is in one of the conservation areas or is itself listed, the heritage case joins the assessment in the submission.

How Redbridge decides householder applications

The council decided 1,638 planning applications in its latest published year. It granted 82.8 per cent of householder applications and 69.8 per cent of minor ones. 94.7 per cent of householder decisions came within the statutory period or an agreed extension.

Minor applications are granted at a lower rate than householder ones, which is a reason to submit the report, the plans and the sections as one coherent pack. Our planning drawings in Redbridge page covers the main set, and the structural calculations in Redbridge page explains where the engineer's work begins.

Party wall and drainage duties for a Redbridge dig

A notice is needed under the Party Wall etc. Act 1996 for excavation within 3 metres of an adjoining building that goes deeper than its foundations, and within 6 metres on the diagonal test. Serve it at least 1 month before work. Our party wall notices service prepares the plans.

Where the water table can rise to within 0.25 metres of the lowest floor, Building Regulations require drainage or protection.

Cost and next step

We are chartered architectural technologists (MCIAT). We draw the scheme, brief the engineer, commission the ground investigation and assemble the report. The price depends on depth, soil and garden size, so after the free constraints check you receive a fixed quote and a plain statement of any limit your plot breaches.

The assessment is best done early. Once the drawings are fixed, a finding that the box is too deep or too close to the street means redrawing every sheet. We measure the garden depth and the soil cover first and tell you what footprint the plot can bear.

If the scheme includes a rear extension, we show how the extension and the basement share the same wall, so the council sees that the two parts are one design.