TW18 3 postcode sector in the TW18 district

TW18 3 is a sector of the TW18 district: every postcode that starts TW18 3. It has 121 postcodes in use, 9 of them large-user postcodes. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.

Not sure what a sector is? UK postcode format explained.

Every postcode in the TW18 3 sector, by flood risk

Map of every postcode in the TW18 3 sector, by flood risk Of the 121 postcodes in the TW18 3 sector that ONS places, 76 have a home or business at high risk, 33 are at medium risk at worst, 4 are at low risk at worst and 8 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 18 postcodes at high or medium risk. Places named: Staines-upon-Thames. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A320 TW18 3BW: not on the flood risk listTW18 3FE: not on the flood risk listTW18 3FF: not on the flood risk listTW18 3FG: not on the flood risk listTW18 3FH: not on the flood risk listTW18 3HP: not on the flood risk listTW18 3FB: low flood risk at worstTW18 3HS: low flood risk at worstTW18 3JB: low flood risk at worstTW18 3JD: low flood risk at worstTW18 3AL: medium flood risk at worstTW18 3AQ: medium flood risk at worstTW18 3AR: medium flood risk at worstTW18 3AS: medium flood risk at worstTW18 3AT: medium flood risk at worstTW18 3AU: medium flood risk at worstTW18 3AW: medium flood risk at worstTW18 3AX: medium flood risk at worstTW18 3AY: medium flood risk at worstTW18 3AZ: medium flood risk at worstTW18 3BF: medium flood risk at worstTW18 3BG: medium flood risk at worstTW18 3BU: medium flood risk at worstTW18 3BX: medium flood risk at worstTW18 3DA: medium flood risk at worstTW18 3DH: medium flood risk at worstTW18 3DJ: medium flood risk at worstTW18 3DP: medium flood risk at worstTW18 3EB: medium flood risk at worstTW18 3ED: medium flood risk at worstTW18 3EE: medium flood risk at worstTW18 3EF: medium flood risk at worstTW18 3EG: medium flood risk at worstTW18 3EQ: medium flood risk at worstTW18 3FD: medium flood risk at worstTW18 3HD: medium flood risk at worstTW18 3HF: medium flood risk at worstTW18 3HJ: medium flood risk at worstTW18 3HQ: medium flood risk at worstTW18 3JA: medium flood risk at worstTW18 3JE: medium flood risk at worstTW18 3JQ: medium flood risk at worstTW18 3AD: high flood riskTW18 3AE: high flood riskTW18 3AF: high flood riskTW18 3AG: high flood riskTW18 3AP: high flood riskTW18 3BA: high flood riskTW18 3DB: high flood riskTW18 3DD: high flood riskTW18 3DE: high flood riskTW18 3DF: high flood riskTW18 3DG: high flood riskTW18 3DQ: high flood riskTW18 3DU: high flood riskTW18 3DW: high flood riskTW18 3HR: high flood riskTW18 3EH: high flood riskTW18 3EJ: high flood riskTW18 3EP: high flood riskTW18 3ER: high flood riskTW18 3ES: high flood riskTW18 3ET: high flood riskTW18 3EU: high flood riskTW18 3EW: high flood riskTW18 3EX: high flood riskTW18 3EY: high flood riskTW18 3EZ: high flood riskTW18 3FA: high flood riskTW18 3HB: high flood riskTW18 3HE: high flood riskTW18 3HG: high flood riskTW18 3HH: high flood riskTW18 3HN: high flood riskTW18 3HT: high flood riskTW18 3HU: high flood riskTW18 3HW: high flood riskTW18 3HX: high flood riskTW18 3JF: high flood riskTW18 3JH: high flood riskTW18 3JJ: high flood riskTW18 3JL: high flood riskTW18 3JN: high flood riskTW18 3JS: high flood riskTW18 3JT: high flood riskTW18 3JU: high flood riskTW18 3JX: high flood riskTW18 3JY: high flood riskTW18 3LA: high flood riskTW18 3LB: high flood riskTW18 3LD: high flood riskTW18 3LF: high flood riskTW18 3LG: high flood riskTW18 3LH: high flood riskTW18 3LJ: high flood riskTW18 3LL: high flood riskTW18 3LN: high flood riskTW18 3LP: high flood riskTW18 3LQ: high flood riskTW18 3LR: high flood riskTW18 3LS: high flood riskTW18 3LT: high flood riskTW18 3LU: high flood riskTW18 3LW: high flood riskTW18 3LX: high flood riskTW18 3LY: high flood riskTW18 3LZ: high flood riskTW18 3NB: high flood riskTW18 3ND: high flood riskTW18 3NF: high flood riskTW18 3NG: high flood riskTW18 3NH: high flood riskTW18 3NJ: high flood riskTW18 3NL: high flood riskTW18 3NP: high flood riskTW18 3NQ: high flood riskTW18 3NW: high flood riskTW18 3NZ: high flood risk Staines-upon-Thames 18 postcodes at high or medium risk, outlined: this goes to TW18 3ND, the one with most homes and businesses at high risk18 postcodes at high or medium risk Map of every postcode in the TW18 3 sector, by flood risk Of the 121 postcodes in the TW18 3 sector that ONS places, 76 have a home or business at high risk, 33 are at medium risk at worst, 4 are at low risk at worst and 8 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 18 postcodes at high or medium risk. Places named: Staines-upon-Thames. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Staines-upon-Thames
  • A home or business at high risk: 76
  • At medium risk at worst: 33
  • At low risk at worst: 4
  • At very low risk only: 0
  • Not on the at-risk list: 8
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 121 postcodes in the TW18 3 sector that ONS places, 76 have a home or business at high risk, 33 are at medium risk at worst, 4 are at low risk at worst and 8 are not on the Environment Agency's at-risk list.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The postcodes at high risk

76 postcodes here have a home or business at high risk. These are the 12 with the most homes and businesses at that risk.

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

TW18 3JY85 at high riskTW18 3ND34 at high riskTW18 3EW34 at high riskTW18 3LG34 at high riskTW18 3LX34 at high riskTW18 3LT32 at high riskTW18 3DE30 at high riskTW18 3JX30 at high riskTW18 3AE29 at high riskTW18 3JN29 at high riskTW18 3DD27 at high riskTW18 3ET27 at high risk

Where the postcodes at high or medium risk lie together

  • 18 postcodes at high or medium risk, outlined on the map. TW18 3ND, is the one with most homes and businesses at high risk.

What do homes sell for in TW18 3?

Homes in TW18 3 sold for a typical £425,000 in the 12 months to August 2026, across 52 sales, up 2.7% on the 12 months before, HM Land Registry's figures show.

£425,000 typical price, the 12 months to August 2026
£413,750 12 months to August 2025
▲ up 2.7% on the 12 months before
  • Detached £658,000 9 sales
  • Semi-detached £480,000 19 sales
  • Terraced £395,000 15 sales
  • Flat or maisonette £230,000 9 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value at the postcodes that start TW18 3. A typical price is the median, the middle sale, given from 5 sales or more.

How we work this out: house prices by postcode

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in TW18 3

Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.

TW18 3ADTW18 3AETW18 3AFTW18 3AGTW18 3ALTW18 3APTW18 3AQTW18 3ARTW18 3ASTW18 3ATTW18 3AUTW18 3AWTW18 3AXTW18 3AYTW18 3AZTW18 3BATW18 3BFTW18 3BGTW18 3BUTW18 3BWTW18 3BXTW18 3DATW18 3DBTW18 3DDTW18 3DETW18 3DFTW18 3DGTW18 3DHTW18 3DJTW18 3DPTW18 3DQTW18 3DUTW18 3DWTW18 3DZTW18 3EBTW18 3EDTW18 3EETW18 3EFTW18 3EGTW18 3EHTW18 3EJTW18 3EPTW18 3EQTW18 3ERTW18 3ESTW18 3ETTW18 3EUTW18 3EWTW18 3EXTW18 3EYTW18 3EZTW18 3FATW18 3FBTW18 3FDTW18 3FETW18 3FFTW18 3FGTW18 3FHTW18 3HBTW18 3HDTW18 3HETW18 3HFTW18 3HGTW18 3HHTW18 3HJTW18 3HNTW18 3HPTW18 3HQTW18 3HRTW18 3HSTW18 3HTTW18 3HUTW18 3HWTW18 3HXTW18 3JATW18 3JBTW18 3JDTW18 3JETW18 3JFTW18 3JHTW18 3JJTW18 3JLTW18 3JNTW18 3JQTW18 3JSTW18 3JTTW18 3JUTW18 3JXTW18 3JYTW18 3LATW18 3LBTW18 3LDTW18 3LFTW18 3LGTW18 3LHTW18 3LJTW18 3LLTW18 3LNTW18 3LPTW18 3LQTW18 3LRTW18 3LSTW18 3LTTW18 3LUTW18 3LWTW18 3LXTW18 3LYTW18 3LZTW18 3NBTW18 3NDTW18 3NFTW18 3NGTW18 3NHTW18 3NJTW18 3NLTW18 3NPTW18 3NQTW18 3NWTW18 3NZTW18 3QXTW18 3WJ

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources

What council am I in? The council, borough or local authority for a postcode, and the county council where there is one. What ward am I in? The ward for a postcode, with its council, constituency and parish.

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