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The shell of a rear house extension with a wide bifold opening and scaffold around it

Rear extension drawings in Kingston from £625

Surbiton, New Malden, Tolworth and Chessington: the Royal Borough’s Residential Design SPD gives a depth, three roof heights and a 50% garden rule.

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

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We check conservation areas and other limits for this address.

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The short answer

Kingston’s Residential Design SPD, adopted on 9 July 2013, says single-storey rear extensions should generally not exceed 3 to 3.5 metres deep and that at least 50% of the rear garden should remain. Heights are capped at 3 metres for a flat roof, 3.3 for a parapet and 4 for a pitched roof. Two-storey rear extensions on a semi boundary are generally unacceptable. 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 garden and the neighbours’ levels and rear building lines
  • A depth and 50% garden check, and a flat, parapet or pitched roof chosen against the 3, 3.3 and 4 metre heights
  • The 25 degree elevation plan Kingston asks for when work rises above two storeys
  • A check of your address against the borough’s 26 conservation areas
  • Plans to the householder list, A3 at most, 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 Kingston rear extension runs

  1. Levels and lines

    We check your garden length and whether the neighbour sits lower or has a different rear building line.

  2. Survey

    We measure the back, the garden and the neighbours’ rear walls and levels.

  3. Design

    You choose depth and roof, with the heights and the route written down.

  4. Draw and submit

    We prepare the pack to the householder list and submit it, then answer the case officer.

Policy Guidance 33 in plain terms

Policy Guidance 33 says single-storey rear extensions, conservatories included, should look proportionate and subordinate to the host building. Extensions should generally not exceed 3 to 3.5 metres deep. If the neighbour is on lower ground the depth should be reduced; if the neighbour has a different rear building line it could be increased. In all cases at least 50% of the rear garden should remain, though very small gardens are judged on their merits.

Heights are given too: a flat roof should not exceed 3 metres, a parapet roof 3.3 metres and a pitched roof 4 metres. A balcony or roof terrace will not be acceptable where it causes overlooking, except on a large plot with screening. For example, a 3.5 metre kitchen with a flat roof at 3 metres suits a typical Surbiton semi; the same kitchen on land a step above next door has to be shortened.

Two storeys, and where permitted development stops

Policy Guidance 34 says two-storey rear extensions may be acceptable on spacious plots with large distances to boundaries, that ones on the boundary of a semi are generally unacceptable and normally resisted, and that on narrow terraced houses they are unlikely to be appropriate. Daylight is tested with the 45 and 25 degree principles.

Under Class A permitted development gives 3 or 4 metres, and 6 and 8 through prior approval, outside conservation areas. Kingston has 26 conservation areas and lists three Article 4 directions, none of them a house direction in a conservation area, so we check your address against both lists.

Prior approval for a larger home extension

What Kingston asks for, and CIL

The February 2024 householder list accepts drawings up to A3 only, asks for a 25 degree elevation plan where an extension rises above two storeys, wants photographs taken in the last three months, and gives 10 working days to make an invalid application valid before an administration fee applies.

Kingston CIL runs from £323.07 a square metre in zone 1 down to £76.92 in zone 4 in 2026, on 100 square metres or more of new floor space, so a typical extension is outside it. Mayoral CIL is in band 2.

Rear extensions in Kingston in numbers

Questions about rear extensions in Kingston

How deep can I go in Kingston?

The SPD says generally not more than 3 to 3.5 metres, with at least 50% of the garden kept. Permitted development with prior approval can allow more outside conservation areas.

Does my neighbour’s level matter?

Yes. If their house sits lower the depth should be reduced; if their rear building line is different it could be increased.

Can I build a pitched roof to 4 metres?

The SPD allows a pitched roof up to 4 metres, a flat roof to 3 and a parapet roof to 3.3.

Can I build upwards at the back too?

Two-storey rear extensions on the boundary of a semi are generally unacceptable, and on narrow terraces unlikely to be appropriate.

See how far your Kingston 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).

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