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The glazed rear of a house extension looking onto a garden

Rear extension drawings in Richmond upon Thames from £625

Twickenham, Teddington, Kew and Barnes: the borough’s House Extensions SPD gives a depth by house type and a low eaves rule for Victorian infills.

£625 £475 drawings + £150 survey (£625 total), no VAT to add

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The short answer

Richmond’s House Extensions and External Alterations SPD says a single-storey rear extension is usually acceptable if it projects no further than 3 metres on a terrace, 3.5 on a semi and 4 on a detached house. The final test is the site. On Victorian infills deeper than that, the eaves should be limited to 2.2 metres. Our fee is £475 drawings + £150 survey (£625 total), no VAT to add; the council’s fee is separate.

Rear extension drawings

from £625

Drawings
£475
Measured survey
£150
Total you pay
£625
VAT
None to add
  • A measured survey of the back of the house, the side return and the neighbours’ windows
  • A depth check against 3, 3.5 or 4 metres for your house type, and the eaves height at the boundary
  • The 25 and 45 degree daylight tests the SPD points to, drawn on the plans
  • A check of your address against the borough’s 85 conservation areas and their Article 4 directions
  • Plans to the 20 February 2026 checklist, and the route that fits submitted for you

£475 drawings + £150 survey (£625 total). A starting fee: we confirm one fixed figure after checking your address. The council’s own fee, where there is one, is paid to the council.

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How a Richmond rear extension runs

  1. House type check

    We establish whether you are terraced, semi or detached, and what is original.

  2. Survey

    We measure the back, the garden and the neighbours’ windows.

  3. Design

    You choose a depth and eaves height, with the route and risk of each written down.

  4. Draw and submit

    We prepare the pack to the 2026 checklist and submit it, then answer the case officer.

Richmond’s depths, and when it allows more

Section 3.1 of the House Extensions SPD, published in May 2015, says the effect of a single-storey extension is usually acceptable if the projection is no further than 3 metres for a terraced property, 3.5 metres for a semi-detached house and 4 metres for a detached one. It adds that the final test depends on the site: distances from the boundary and neighbouring properties, height next to the boundary, materials and the layout of neighbouring sites may justify a greater projection.

It then singles out the Victorian infill. Where an infill extension is deeper than those figures, the eaves height should be limited to 2.2 metres to reduce the sense of enclosure. For example, a long glazed infill along a Twickenham terrace is workable if the eaves stay at 2.2 metres on the boundary and the roof lights do the rest.

Daylight, privacy and the garden you keep

The SPD says extensions should pass the Building Research Establishment 25 and 45 degree tests and not cause a significant loss of daylight to habitable rooms or gardens next door. Windows in a wall facing a neighbouring house or garden should be high level, obscure glazed or left out, and using an extension roof as a balcony will normally be unacceptable. It also lists garden space to keep: 70 square metres for a house with three or more bedrooms.

Permitted development gives 3 or 4 metres, and 6 and 8 metres through prior approval, but rights are removed in conservation areas. Richmond has 85 of them, with their Article 4 directions listed area by area, so we check your road first.

Prior approval for a larger home extension

Validation and CIL

The borough’s Local Validation Checklist, in effect from 20 February 2026, asks every applicant for a biodiversity net gain statement, with a reason and evidence where exempt.

Richmond’s CIL for 2026 is £418.41 a square metre in the higher residential band and £317.99 in the lower, on 100 square metres or more of new floor space, so a typical extension is outside it. Mayoral CIL is in band 1.

Rear extensions in Richmond upon Thames in numbers

Questions about rear extensions in Richmond upon Thames

How deep can a semi in Richmond go?

The SPD says up to 3.5 metres is usually acceptable. The final test is the site, and permitted development with prior approval can allow more.

What is the 2.2 metre rule?

For Victorian infills deeper than the usual figures, the SPD says the eaves should be limited to 2.2 metres to reduce enclosure for the neighbour.

Can I use the flat roof as a terrace?

Using an extension roof as a balcony will normally be unacceptable, because of overlooking.

Do I pay CIL on a kitchen extension?

Not normally. CIL applies at 100 square metres of new floor space or a new dwelling.

See how far your Richmond house can go

Send the address and a photo of the back. We reply with the route and a fixed fee, from £475 drawings + £150 survey (£625 total).

Get my fixed feeCall 020 7131 9705