SL9 postcode area guide — Buckinghamshire

Where is SL9?

Broadband & internet speeds in SL9

Excellent coverage

Broadband availability in the SL9 postcode district (Buckinghamshire) is Excellent — gigabit-capable full fibre is widely available. Across the 849 postcodes Ofcom measures in SL9, superfast broadband (30 Mbit/s or faster) reaches 96.4% of premises and gigabit-capable lines are available to 86.4%.

Around 0% of premises in SL9 fall below the Universal Service Obligation (a minimum of 10 Mbit/s download and 1 Mbit/s upload), so the overwhelming majority of homes and businesses here can already order a decent fixed line. For a business that depends on its connection, the figures that matter most are gigabit and full-fibre availability — the symmetric, low-contention services we quote leased lines and FTTP against.

Sample postcodes in SL9

Run a speed test to see what you're actually getting, or check your exact postcode.

Mobile signal around Buckinghamshire

Ofcom's coverage model for the wider Buckinghamshire district (250,700 premises):

Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.

Crime in SL9

Police recorded 71 incidents within about a mile of the centre of SL9 in May 2026 (latest published street-level data). The breakdown:

Raw counts favour busy town centres — a high street with shops and nightlife records more incidents than a residential cul-de-sac. Source: police.uk open data (point sample around the district centroid).

House prices in SL9

Based on 213 sales registered with HM Land Registry in the last 12 months, the median sold price in SL9 is £845,000, up 1.8% on the previous year (£830,000).

Latest recorded sales in SL9

Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.

Who lives here? Buckinghamshire demographics

Census 2021 figures for the wider Buckinghamshire district (553,079 residents, 220,327 households):

Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.

Schools in and around SL9

Source: DfE Get Information about Schools (England & Wales). Check Ofsted report cards for inspection detail — headline one-word grades were retired in 2024.

Food hygiene ratings in SL9

150 rated food businesses operate in SL9. 101 hold the top rating of 5, 26 are rated 4, and 1 are rated 2 or below.

Among the 5-rated: @homePizza, Acorn Montessori School, Amore Restaurant, Austenwood Nursing Home, Birring Greengrocers.

Source: Food Standards Agency, food hygiene ratings (FHRS) open data.

Energy performance (EPC) in SL9

From a sample of 174 Energy Performance Certificates across 12 SL9 postcodes, the most common rating is band B (average band C). 56% of sampled homes are rated C or better.

Source: MHCLG Energy Performance of Buildings Data (England & Wales), sampled at postcode level and refreshed monthly. Individual certificates are on each postcode’s page.

Phone area codes for Buckinghamshire

Landlines around SL9 typically use:

Had a call from an unknown number? Use our free UK phone number checker to see who called.

What's it like living in SL9?

Postcodes in SL9

Neighbouring districts

All Slough (SL) postcode districts ›

Frequently asked questions

Sources: HM Land Registry Price Paid Data, police.uk street-level crime, Ofcom Connected Nations, ONS Census 2021, DfE Get Information about Schools, Food Standards Agency FHRS — all © Crown copyright, licensed under the Open Government Licence v3.0. Figures are area aggregates; individual addresses vary. Energy performance (EPC) data will be added when our Open Data Communities registration is approved.