Structural calculations in Sutton

Footings, trees and monuments in Sutton

New footings are the thread through those rules. An archaeological assessment is required on a householder application in this case: 50 m of an Ancient Monument + new or additional footings. Separately, the council wants a subsidence or structural damage report from an expert when works to a protected tree are justified by damage to property, and that report sits beside an arboricultural report. We therefore settle foundation depth and position early, from the survey, so the extension is not redesigned after validation.

Sutton also lists a Construction Management Plan among its supporting documents, covering hoarding, hours, dust, noise and vibration. For a tight suburban plot the structural sequence, with props and temporary supports, is part of that plan, so we write it down.

What Sutton's housing means for the steel

With 64.4 per cent of households owner-occupied and large gardens (domestic gardens cover 34.5 per cent of the land), the typical Sutton job is a rear extension or a loft on a semi-detached or terraced house. The extension needs a beam over the new opening and bearings that clear the drains. The loft needs floor joists upgraded or replaced, plus a ridge or purlin check.

We measure the house first. Wall thickness, floor spans and the position of the chimney stack decide the loads, and we write them on the drawings so the engineer's sizes match what is built.

Sutton's low-rise streets also make the sequence of works easy to get wrong. A beam goes in only after the props are set and the wall above is supported, and the padstones need time to cure before the load comes on. Our layout drawing numbers each step, so the builder does not have to guess and the building control officer can see the order on one sheet.

Where a calculation shows that a simple lintel will do, we say so. The aim is a sized, justified answer for each opening, not the heaviest steel on the shelf.

Heritage and decisions in Sutton

Sutton has 8 conservation areas and 209 listed entries. The borough decided 601 householder applications in its latest year and granted 91.8 per cent, with 94.8 per cent decided on time.

If a project needs permission as well as calculations, our planning drawings in Sutton cover that route, and a Lawful Development Certificate in Sutton confirms permitted development where it applies.

What you receive and the price

Structural calculations start at £295 with VAT included. The package is the calculations, a beam and padstone schedule and a layout drawing, normally ready after the survey. Another chartered technologist checks it, and revisions after building control comments are free.

The calculations sit inside our building regulations drawings in Sutton. For wider engineering, see structural engineering in Sutton. The overview of the service is on our structural calculations page, the borough is covered under architectural drawings in Sutton, and neighbouring rules are in Croydon and Merton.