AL4 postcode area guide — Hertsmere

Where is AL4?

Broadband & internet speeds in AL4

Excellent coverage

Broadband availability in the AL4 postcode district (Hertsmere) is Excellent — gigabit-capable full fibre is widely available. Across the 777 postcodes Ofcom measures in AL4, superfast broadband (30 Mbit/s or faster) reaches 94.5% of premises and gigabit-capable lines are available to 85.5%.

Around 0.3% of premises in AL4 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 AL4

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

Mobile signal around Hertsmere

Ofcom's coverage model for the wider Hertsmere district (47,691 premises):

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

Crime in AL4

Police recorded 55 incidents within about a mile of the centre of AL4 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 AL4

Based on 257 sales registered with HM Land Registry in the last 12 months, the median sold price in AL4 is £612,500, down 5.8% on the previous year (£650,000).

Latest recorded sales in AL4

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

Who lives here? Hertsmere demographics

Census 2021 figures for the wider Hertsmere district (107,827 residents, 42,682 households):

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

Schools in and around AL4

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 AL4

132 rated food businesses operate in AL4. 95 hold the top rating of 5, 23 are rated 4, and 1 are rated 2 or below.

Among the 5-rated: Ab Salute Gym, Aspens catering @ Beech Hyde Primary School, Aspens catering @ Nicholas Breakspear Catholic, B Healthy, Betty's 'Best Before' Bargains.

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

Energy performance (EPC) in AL4

From a sample of 133 Energy Performance Certificates across 12 AL4 postcodes, the most common rating is band D (average band D). 37% 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 Hertsmere

Landlines around AL4 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 AL4?

Postcodes in AL4

Neighbouring districts

All St Albans (AL) 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.