SG4 postcode area guide — North Hertfordshire

Where is SG4?

Broadband & internet speeds in SG4

Strong coverage

Broadband availability in the SG4 postcode district (North Hertfordshire) is Strong — superfast is near-universal and gigabit is rolling out. Across the 886 postcodes Ofcom measures in SG4, superfast broadband (30 Mbit/s or faster) reaches 90% of premises and gigabit-capable lines are available to 65.2%.

Around 1.7% of premises in SG4 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 SG4

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

Mobile signal around North Hertfordshire

Ofcom's coverage model for the wider North Hertfordshire district (63,507 premises):

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

Crime in SG4

Police recorded 7 incidents within about a mile of the centre of SG4 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 SG4

Based on 348 sales registered with HM Land Registry in the last 12 months, the median sold price in SG4 is £450,000, down 7.2% on the previous year (£485,000).

Latest recorded sales in SG4

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

Who lives here? North Hertfordshire demographics

Census 2021 figures for the wider North Hertfordshire district (133,210 residents, 56,733 households):

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

Schools in and around SG4

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 SG4

169 rated food businesses operate in SG4. 116 hold the top rating of 5, 33 are rated 4, and 5 are rated 2 or below.

Among the 5-rated: After School Club - 326, Alternative Catering, AnX Bar, Asda Supermarket, Benslow Music Trust.

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

Energy performance (EPC) in SG4

From a sample of 137 Energy Performance Certificates across 12 SG4 postcodes, the most common rating is band D (average band D). 43% 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 North Hertfordshire

Landlines around SG4 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 SG4?

Postcodes in SG4

Neighbouring districts

All Stevenage (SG) 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.