HP21 postcode area guide — Buckinghamshire

Where is HP21?

Broadband & internet speeds in HP21

Excellent coverage

Broadband availability in the HP21 postcode district (Buckinghamshire) is Excellent — gigabit-capable full fibre is widely available. Across the 708 postcodes Ofcom measures in HP21, superfast broadband (30 Mbit/s or faster) reaches 99.5% of premises and gigabit-capable lines are available to 85.6%.

Around 0% of premises in HP21 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 HP21

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 HP21

Police recorded 351 incidents within about a mile of the centre of HP21 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 HP21

Based on 346 sales registered with HM Land Registry in the last 12 months, the median sold price in HP21 is £315,000, down 1.6% on the previous year (£320,000).

Latest recorded sales in HP21

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 HP21

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 HP21

115 rated food businesses operate in HP21. 97 hold the top rating of 5, 9 are rated 4, and 1 are rated 2 or below.

Among the 5-rated: Asda Express Borough PFS, Asda Stores, Ashmead Combined School Breakfast Club, Aylesbury College Day Nursery, Aylesbury Grammar School.

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

Energy performance (EPC) in HP21

From a sample of 217 Energy Performance Certificates across 11 HP21 postcodes, the most common rating is band C (average band C). 58% 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 HP21 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 HP21?

Postcodes in HP21

Neighbouring districts

All Hemel Hempstead (HP) 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.