Architectural drawings in Spelthorne

Two-storey and side additions in Spelthorne

Upper-floor work follows tighter tests. The guidance asks that a two-storey side extension either steps back from the front or sits in from the boundary by 1 m, with more for larger houses, and it applies the 45 degrees guide from the middle of a neighbour's habitable window in plan and in section.

Separation distances are the part most owners do not expect: back-to-back and back-to-flank minimums of 21 m; 13.5 m; 1 m apply to two and three storey additions. A second storey on a house that backs onto another is often decided by those figures, not by taste.

Our double-storey extension drawings in Spelthorne therefore start with the separation check, because it can rule an option in or out before any money goes into design.

Green belt, trees and heritage

About 65 per cent of the borough is covered by green-belt polygons, so a plot beside open land may sit under a different test: whether a proposal is disproportionate to the original building. Anything beyond the footprint needs a sound reason and a restrained design.

Trees add a second boundary. The council holds 283 tree preservation orders, mapped across 2,656 zones, so a mature oak at the end of a long garden can fix the line of an annexe or garden room.

Heritage is thinner than in inner London but real: 8 conservation areas and 203 listed buildings, among them 3 at Grade I and 5 scheduled monuments. We note each constraint in the written check so you are not surprised halfway through.

Shared housing is controlled borough-wide

Spelthorne applies an Article 4 direction to houses in multiple occupation, and the Managing the Development of Houses in Multiple Occupation (HMOs) SPD sets out the tests. The council records the direction as reaching every ward (13 March 2026 (all wards)), so any new shared house needs a planning application rather than a notification.

One test is numeric. The council treats a concentration as harmful at 10% within 40 m, so we count nearby HMOs on your road before you commit to a purchase. Landlords who ask us after exchange have far fewer options than those who ask before.

Our HMO conversion drawings in Spelthorne are prepared as a full application from the outset, with room sizes and layouts matched to the published standards.

What the council's recent figures tell owners

In its latest year Spelthorne decided 351 householder applications and granted 87.2 per cent, with 97.2 per cent decided on time.

Prior approval for larger rear extensions was closely contested: 14 granted against 17 refused, so more were turned down than allowed. Larger schemes are tested at the neighbour-consultation step, so we draw the neighbour's windows and boundary on the submission sheets to answer it. The council also issued 165 lawful development certificates, a route covered by our Lawful Development Certificate service.

These figures describe the borough's past and we never treat them as a forecast for your house.

Homes, prices and what owners build

Of 41,805 households, 72.9 per cent live in a house or bungalow and 68.1 per cent own their home. Land Registry puts the average detached sale at £798,851 and the average terraced sale at £427,759, with the all-types average moving -2.9 per cent over twelve months.

A flat market with large plots favours improving over moving. We see garden rooms, loft conversions and rear extensions far more often than new-build schemes, and the charging schedule matters mostly to the larger jobs: it is the CIL Charging Schedule - December 2014.

Start with planning drawings in Spelthorne for an extension, or garden room drawings in Spelthorne for an outbuilding. Across the Thames, the hubs for Hounslow, Elmbridge and Richmond upon Thames cover similar suburban stock.

Architectural drawings in Spelthorne: how a job runs

A measured survey comes first, then a Revit model and options in plan and 3D. Once you freeze the design, a technologist who did not draw it reviews every sheet, and we submit through the Planning Portal. Free redraws continue until the council decides.