A residential street in Surbiton lined with brick Victorian terraced houses with white bay windows, a red car parked on the right and a 20 mph road marking
Floor plan drawings, pencil sketches of a house, a scale rule and a protractor spread across a desk
Photo: Tima Miroshnichenko / Pexels

Flood risk assessment · London Borough of Kingston upon Thames

Flood risk assessment in Kingston upon Thames, from £375 fixed

Kingston's householder validation list asks for a flood risk assessment on the Environment Agency form not only in Flood Zones 2 and 3 but wherever there is surface water flood risk or a Critical Drainage Area. We check all three maps for your address before you apply, so the application is not held at validation.

Flood risk assessmentfrom £375
Get your fixed feeFFP-01 · Rev A
Our fixed feefrom £375
Council fee, paid to your councilNone
Total, our feefrom £375
CoverageAll 33 boroughs
Get this fee in writing

or email hello@fixedfeeplans.co.uk

No obligation. Nothing is sent until you ask; your enquiry comes to us and nowhere else.

Starts at£150
Boroughs33/33
Stages5

Photo: Hugh Venables / Wikimedia Commons, CC BY-SA 2.0

Fixed fee, in writing

Tell us about your project

Send the postcode and what you want to build, and add photos or old plans if you have them. We reply with the fee in writing and the payment stages set out in full.

Ask for your fixed fee in writing

Name and email are required. Everything else helps us price it, but is optional.

Your enquiry goes to us and nowhere else. It is never syndicated or sold. See our privacy notice.

A red clad outbuilding with a white window standing in brown floodwater among bare trees
Flood-resistant materials are specified to a height above the estimated flood level. Photo: Serge Lavoie / Pexels.

What Kingston upon Thames Council asks of a flood risk assessment

From the council's Householder Validation Local List (adopted February 2024 edition, read 29 October 2026).

  • Kingston asks for a flood risk assessment with all householder applications in Flood Zone 2 or 3, subject to surface water flood risk, or within a Critical Drainage Area. (source, checked 29 October 2026)
  • The assessment should be provided on the standard Environment Agency form, which the council makes available on its website. (source, checked 29 October 2026)
  • The council points applicants to the government's flood map for planning for flood zones and surface water risk, and to its own interactive Heritage map to find out whether the site is in a Critical Drainage Area. (source, checked 29 October 2026)

What Kingston upon Thames flood risk assessment drawings have to show

In Kingston we check three maps, not one: the flood zones along the Thames and the Hogsmill, the surface water risk map, and the council's Critical Drainage Areas. A house well away from either river can still need the form because of surface water alone.

The assessment is written on the Environment Agency form the council asks for, with the floor level of the extension, the flood level it is measured against and the resilience measures, and the drawings show the same figures.

PS2 · at a glance

Kingston upon Thames: 742 householder decisions

Kingston upon Thames
Approvals, prior approvals included83%

616 of 742 granted. London: 85.8%.

Decided within 8 weeks92.9%

593 of 638 applications, prior approvals excluded.

Source: MHCLG PS2, 1 July 2025 to 30 June 2026. Dark tick: London.
Two hands holding a printed floor plan over a desk of drawings, with a pen and notebook beside it
Checking the drawings with you before anything goes to the council. Photo: Tima Miroshnichenko / Pexels.

What it costs in Kingston upon Thames

  • Flood risk assessment: from £375.

Flood risk assessment across London · Kingston upon Thames planning rules · every price

Flood risk assessment · Kingston upon Thames

What happens next in Kingston upon Thames

We check your address on every map the council uses, take the flood level with climate change, set the floor level and resilience measures, and mark them on the drawings.

Photo: Helena Jankovičová Kováčová / Pexels

Answers

Kingston upon Thames flood risk assessment questions

When do I need a flood risk assessment for an extension in Kingston?
When the house is in Flood Zone 2 or 3, is subject to surface water flood risk, or falls within a Critical Drainage Area, according to Kingston's Householder Validation Local List. That is wider than the national rule, so a house away from the Thames or the Hogsmill can still need one.
How do I check whether my Kingston house is in a Critical Drainage Area?
Kingston points applicants to its interactive Heritage map to find out whether the site is in a Critical Drainage Area, and to the government's flood map for planning for flood zones and surface water risk. We run both checks for your address before we quote.

Start with £150

Your fixed fee is already on this page.

Tell us the postcode and what you want to build. We confirm the fee in writing and book the survey.

Get my fixed fee020 7131 9703
01
Measured surveyWithin five working days
£150
02
Existing drawingsThe building as it stands
£175
03
Proposed drawingsYour scheme, revised until right
£225
04
Planning application packForms, statements, OS plans
£125
05
Submission and agent servicePortal submission, queries handled
£120
Total, planning application£795
Get my fixed fee