SL4 3 postcode sector in the SL4 district

SL4 3 is a sector of the SL4 district: every postcode that starts SL4 3. It has 238 postcodes in use, 11 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 SL4 3 sector, by flood risk

Map of every postcode in the SL4 3 sector, by flood risk Of the 238 postcodes in the SL4 3 sector that ONS places, 3 have a home or business at high risk, 7 are at medium risk at worst, 18 are at low risk at worst, 18 are at very low risk only and 192 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 8 postcodes at high or medium risk. Places named: Windsor. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 250 m. A308A332 SL4 3AA: not on the flood risk listSL4 3AE: not on the flood risk listSL4 3AG: not on the flood risk listSL4 3AH: not on the flood risk listSL4 3AJ: not on the flood risk listSL4 3AN: not on the flood risk listSL4 3AP: not on the flood risk listSL4 3AQ: not on the flood risk listSL4 3AR: not on the flood risk listSL4 3AS: not on the flood risk listSL4 3AT: not on the flood risk listSL4 3AU: not on the flood risk listSL4 3AX: not on the flood risk listSL4 3AZ: not on the flood risk listSL4 3BB: not on the flood risk listSL4 3BD: not on the flood risk listSL4 3BE: not on the flood risk listSL4 3BG: not on the flood risk listSL4 3BH: not on the flood risk listSL4 3BJ: not on the flood risk listSL4 3BL: not on the flood risk listSL4 3BN: not on the flood risk listSL4 3BP: not on the flood risk listSL4 3BQ: not on the flood risk listSL4 3BT: not on the flood risk listSL4 3BU: not on the flood risk listSL4 3BW: not on the flood risk listSL4 3BX: not on the flood risk listSL4 3BY: not on the flood risk listSL4 3BZ: not on the flood risk listSL4 3DA: not on the flood risk listSL4 3DB: not on the flood risk listSL4 3DD: not on the flood risk listSL4 3DE: not on the flood risk listSL4 3DF: not on the flood risk listSL4 3DG: not on the flood risk listSL4 3DH: not on the flood risk listSL4 3DJ: not on the flood risk listSL4 3DL: not on the flood risk listSL4 3DN: not on the flood risk listSL4 3DP: not on the flood risk listSL4 3DQ: not on the flood risk listSL4 3DS: not on the flood risk listSL4 3DT: not on the flood risk listSL4 3DU: not on the flood risk listSL4 3DW: not on the flood risk listSL4 3DX: not on the flood risk listSL4 3DY: not on the flood risk listSL4 3DZ: not on the flood risk listSL4 3EA: not on the flood risk listSL4 3EB: not on the flood risk listSL4 3ED: not on the flood risk listSL4 3EE: not on the flood risk listSL4 3EH: not on the flood risk listSL4 3EL: not on the flood risk listSL4 3EN: not on the flood risk listSL4 3EP: not on the flood risk listSL4 3ES: not on the flood risk listSL4 3ET: not on the flood risk listSL4 3EU: not on the flood risk listSL4 3EW: not on the flood risk listSL4 3EX: not on the flood risk listSL4 3EY: not on the flood risk listSL4 3EZ: not on the flood risk listSL4 3FA: not on the flood risk listSL4 3FE: not on the flood risk listSL4 3FF: not on the flood risk listSL4 3FG: not on the flood risk listSL4 3FH: not on the flood risk listSL4 3FJ: not on the flood risk listSL4 3FL: not on the flood risk listSL4 3FP: not on the flood risk listSL4 3FQ: not on the flood risk listSL4 3GZ: not on the flood risk listSL4 3HB: not on the flood risk listSL4 3HE: not on the flood risk listSL4 3JE: not on the flood risk listSL4 3JF: not on the flood risk listSL4 3JG: not on the flood risk listSL4 3JH: not on the flood risk listSL4 3JY: not on the flood risk listSL4 3JZ: not on the flood risk listSL4 3LA: not on the flood risk listSL4 3LB: not on the flood risk listSL4 3LD: not on the flood risk listSL4 3LE: not on the flood risk listSL4 3LF: not on the flood risk listSL4 3LN: not on the flood risk listSL4 3LP: not on the flood risk listSL4 3LR: not on the flood risk listSL4 3LS: not on the flood risk listSL4 3LT: not on the flood risk listSL4 3LU: not on the flood risk listSL4 3LW: not on the flood risk listSL4 3LX: not on the flood risk listSL4 3LY: not on the flood risk listSL4 3LZ: not on the flood risk listSL4 3NA: not on the flood risk listSL4 3NB: not on the flood risk listSL4 3ND: not on the flood risk listSL4 3NE: not on the flood risk listSL4 3NF: not on the flood risk listSL4 3NG: not on the flood risk listSL4 3NH: not on the flood risk listSL4 3NJ: not on the flood risk listSL4 3NL: not on the flood risk listSL4 3NN: not on the flood risk listSL4 3NP: not on the flood risk listSL4 3NQ: not on the flood risk listSL4 3NT: not on the flood risk listSL4 3NU: not on the flood risk listSL4 3NW: not on the flood risk listSL4 3NX: not on the flood risk listSL4 3NY: not on the flood risk listSL4 3NZ: not on the flood risk listSL4 3PA: not on the flood risk listSL4 3PB: not on the flood risk listSL4 3PD: not on the flood risk listSL4 3PE: not on the flood risk listSL4 3PF: not on the flood risk listSL4 3PG: not on the flood risk listSL4 3PH: not on the flood risk listSL4 3PJ: not on the flood risk listSL4 3PL: not on the flood risk listSL4 3PN: not on the flood risk listSL4 3PP: not on the flood risk listSL4 3PQ: not on the flood risk listSL4 3PR: not on the flood risk listSL4 3PS: not on the flood risk listSL4 3PT: not on the flood risk listSL4 3PU: not on the flood risk listSL4 3PW: not on the flood risk listSL4 3PX: not on the flood risk listSL4 3PY: not on the flood risk listSL4 3PZ: not on the flood risk listSL4 3QA: not on the flood risk listSL4 3QE: not on the flood risk listSL4 3QP: not on the flood risk listSL4 3QQ: not on the flood risk listSL4 3QR: not on the flood risk listSL4 3QS: not on the flood risk listSL4 3QT: not on the flood risk listSL4 3QU: not on the flood risk listSL4 3QW: not on the flood risk listSL4 3QX: not on the flood risk listSL4 3QY: not on the flood risk listSL4 3QZ: not on the flood risk listSL4 3RA: not on the flood risk listSL4 3RB: not on the flood risk listSL4 3RD: not on the flood risk listSL4 3RE: not on the flood risk listSL4 3RF: not on the flood risk listSL4 3RG: not on the flood risk listSL4 3RH: not on the flood risk listSL4 3RJ: not on the flood risk listSL4 3RL: not on the flood risk listSL4 3RN: not on the flood risk listSL4 3RQ: not on the flood risk listSL4 3RR: not on the flood risk listSL4 3RT: not on the flood risk listSL4 3RU: not on the flood risk listSL4 3RW: not on the flood risk listSL4 3RX: not on the flood risk listSL4 3RY: not on the flood risk listSL4 3RZ: not on the flood risk listSL4 3SB: not on the flood risk listSL4 3SD: not on the flood risk listSL4 3SN: not on the flood risk listSL4 3SP: not on the flood risk listSL4 3SQ: not on the flood risk listSL4 3SR: not on the flood risk listSL4 3ST: not on the flood risk listSL4 3SU: not on the flood risk listSL4 3SW: not on the flood risk listSL4 3SX: not on the flood risk listSL4 3SY: not on the flood risk listSL4 3SZ: not on the flood risk listSL4 3TA: not on the flood risk listSL4 3TB: not on the flood risk listSL4 3TD: not on the flood risk listSL4 3TE: not on the flood risk listSL4 3TH: not on the flood risk listSL4 3TN: not on the flood risk listSL4 3TQ: not on the flood risk listSL4 3TR: not on the flood risk listSL4 3TS: not on the flood risk listSL4 3TT: not on the flood risk listSL4 3TW: not on the flood risk listSL4 3UU: not on the flood risk listSL4 3WA: not on the flood risk listSL4 3WN: not on the flood risk listSL4 3YL: not on the flood risk listSL4 3DR: very low flood risk onlySL4 3EG: very low flood risk onlySL4 3EQ: very low flood risk onlySL4 3HA: very low flood risk onlySL4 3HD: very low flood risk onlySL4 3HY: very low flood risk onlySL4 3JA: very low flood risk onlySL4 3JB: very low flood risk onlySL4 3JD: very low flood risk onlySL4 3JJ: very low flood risk onlySL4 3JP: very low flood risk onlySL4 3JW: very low flood risk onlySL4 3LL: very low flood risk onlySL4 3QB: very low flood risk onlySL4 3QF: very low flood risk onlySL4 3SG: very low flood risk onlySL4 3SJ: very low flood risk onlySL4 3SS: very low flood risk onlySL4 3BA: low flood risk at worstSL4 3HH: low flood risk at worstSL4 3HJ: low flood risk at worstSL4 3HL: low flood risk at worstSL4 3HN: low flood risk at worstSL4 3HP: low flood risk at worstSL4 3HQ: low flood risk at worstSL4 3HR: low flood risk at worstSL4 3HU: low flood risk at worstSL4 3HW: low flood risk at worstSL4 3QD: low flood risk at worstSL4 3QN: low flood risk at worstSL4 3SA: low flood risk at worstSL4 3SE: low flood risk at worstSL4 3SF: low flood risk at worstSL4 3SH: low flood risk at worstSL4 3SL: low flood risk at worstSL4 3TP: low flood risk at worstSL4 3HS: medium flood risk at worstSL4 3JL: medium flood risk at worstSL4 3JN: medium flood risk at worstSL4 3JR: medium flood risk at worstSL4 3JS: medium flood risk at worstSL4 3JU: medium flood risk at worstSL4 3JX: medium flood risk at worstSL4 3AL: high flood riskSL4 3ER: high flood riskSL4 3JQ: high flood risk Windsor 8 postcodes at high or medium risk, outlined: this goes to SL4 3JQ, the one with most homes and businesses at high risk8 postcodes at high or medium risk Map of every postcode in the SL4 3 sector, by flood risk Of the 238 postcodes in the SL4 3 sector that ONS places, 3 have a home or business at high risk, 7 are at medium risk at worst, 18 are at low risk at worst, 18 are at very low risk only and 192 are not on the Environment Agency's at-risk list. One group of postcodes at high or medium risk is outlined: 8 postcodes at high or medium risk. Places named: Windsor. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A332 Windsor
  • A home or business at high risk: 3
  • At medium risk at worst: 7
  • At low risk at worst: 18
  • At very low risk only: 18
  • Not on the at-risk list: 192
  • Outline: where 5 or more postcodes at high or medium risk lie together

Of the 238 postcodes in the SL4 3 sector that ONS places, 3 have a home or business at high risk, 7 are at medium risk at worst, 18 are at low risk at worst, 18 are at very low risk only and 192 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.

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

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

SL4 3ER4 at high riskSL4 3JQ3 at high riskSL4 3AL1 at high risk

Where the postcodes at high or medium risk lie together

  • 8 postcodes at high or medium risk, outlined on the map. SL4 3JQ, is the one with most homes and businesses at high risk.

What do homes sell for in SL4 3?

Homes in SL4 3 sold for a typical £430,000 in the 12 months to August 2026, across 97 sales, down 9.5% on the 12 months before, HM Land Registry's figures show.

£430,000 typical price, the 12 months to August 2026
£475,000 12 months to August 2025
▼ down 9.5% on the 12 months before
  • Detached £1,040,000 6 sales
  • Semi-detached £756,000 22 sales
  • Terraced £655,000 20 sales
  • Flat or maisonette £315,000 49 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 SL4 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 SL4 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.

SL4 3AASL4 3AESL4 3AGSL4 3AHSL4 3AJSL4 3ALSL4 3ANSL4 3APSL4 3AQSL4 3ARSL4 3ASSL4 3ATSL4 3AUSL4 3AXSL4 3AZSL4 3BASL4 3BBSL4 3BDSL4 3BESL4 3BGSL4 3BHSL4 3BJSL4 3BLSL4 3BNSL4 3BPSL4 3BQSL4 3BTSL4 3BUSL4 3BWSL4 3BXSL4 3BYSL4 3BZSL4 3DASL4 3DBSL4 3DDSL4 3DESL4 3DFSL4 3DGSL4 3DHSL4 3DJSL4 3DLSL4 3DNSL4 3DPSL4 3DQSL4 3DRSL4 3DSSL4 3DTSL4 3DUSL4 3DWSL4 3DXSL4 3DYSL4 3DZSL4 3EASL4 3EBSL4 3EDSL4 3EESL4 3EGSL4 3EHSL4 3ELSL4 3ENSL4 3EPSL4 3EQSL4 3ERSL4 3ESSL4 3ETSL4 3EUSL4 3EWSL4 3EXSL4 3EYSL4 3EZSL4 3FASL4 3FESL4 3FFSL4 3FGSL4 3FHSL4 3FJSL4 3FLSL4 3FPSL4 3FQSL4 3GZSL4 3HASL4 3HBSL4 3HDSL4 3HESL4 3HHSL4 3HJSL4 3HLSL4 3HNSL4 3HPSL4 3HQSL4 3HRSL4 3HSSL4 3HUSL4 3HWSL4 3HYSL4 3JASL4 3JBSL4 3JDSL4 3JESL4 3JFSL4 3JGSL4 3JHSL4 3JJSL4 3JLSL4 3JNSL4 3JPSL4 3JQSL4 3JRSL4 3JSSL4 3JUSL4 3JWSL4 3JXSL4 3JYSL4 3JZSL4 3LASL4 3LBSL4 3LDSL4 3LESL4 3LFSL4 3LLSL4 3LNSL4 3LPSL4 3LRSL4 3LSSL4 3LTSL4 3LUSL4 3LWSL4 3LXSL4 3LYSL4 3LZSL4 3NASL4 3NBSL4 3NDSL4 3NESL4 3NFSL4 3NGSL4 3NHSL4 3NJSL4 3NLSL4 3NNSL4 3NPSL4 3NQSL4 3NTSL4 3NUSL4 3NWSL4 3NXSL4 3NYSL4 3NZSL4 3PASL4 3PBSL4 3PDSL4 3PESL4 3PFSL4 3PGSL4 3PHSL4 3PJSL4 3PLSL4 3PNSL4 3PPSL4 3PQSL4 3PRSL4 3PSSL4 3PTSL4 3PUSL4 3PWSL4 3PXSL4 3PYSL4 3PZSL4 3QASL4 3QBSL4 3QDSL4 3QESL4 3QFSL4 3QNSL4 3QPSL4 3QQSL4 3QRSL4 3QSSL4 3QTSL4 3QUSL4 3QWSL4 3QXSL4 3QYSL4 3QZSL4 3RASL4 3RBSL4 3RDSL4 3RESL4 3RFSL4 3RGSL4 3RHSL4 3RJSL4 3RLSL4 3RNSL4 3RQSL4 3RRSL4 3RTSL4 3RUSL4 3RWSL4 3RXSL4 3RYSL4 3RZSL4 3SASL4 3SBSL4 3SDSL4 3SESL4 3SFSL4 3SGSL4 3SHSL4 3SJSL4 3SLSL4 3SNSL4 3SPSL4 3SQSL4 3SRSL4 3SSSL4 3STSL4 3SUSL4 3SWSL4 3SXSL4 3SYSL4 3SZSL4 3TASL4 3TBSL4 3TDSL4 3TESL4 3THSL4 3TNSL4 3TPSL4 3TQSL4 3TRSL4 3TSSL4 3TTSL4 3TWSL4 3UUSL4 3WASL4 3WNSL4 3YL

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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