SG3 Postcode Data
Property data for the SG3 postcode district covering East Hertfordshire. Sold prices, crime statistics, energy performance, and demographic insights, all from HM Land Registry, Police UK, and the EPC Register.
Quick answer
The average sale price in SG3 is £350,038 (median £173,000), based on 33 HM Land Registry transactions. Police UK recorded 24 crimes within a 1-mile radius in 2026-03. The average EPC rating across 133 certified properties is 63/100.
Headline pricing in SG3 is above the UK national average (England & Wales average ~£290k as of 2025). Stock is dominated by flat-maisonette properties (20 of the last 33 sales). Energy efficiency here is weaker than average (expect higher running costs and lower mortgage-affordability scores from green lenders).
Avg sale price
£350,038
33 sales
Median price
£173,000
Crime incidents
24
2026-03
Avg EPC score
63/100
133 certs
Recent sold prices
Latest 30 property sales in the SG3 area, sourced from HM Land Registry Price Paid Data.
flat-maisonette
£150,312
20 sales
detached
£657,308
13 sales
| Date | Address | Type | Price |
|---|---|---|---|
| Feb 2022 | 3E - 3F, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £163,000 |
| Feb 2021 | 5C, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £185,000 |
| Oct 2020 | 5A - 5B, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £173,000 |
| Jun 2020 | 9, STEVENAGE ROAD, KNEBWORTH | detached | £1,220,000 |
| Aug 2019 | LONGDENE, OLD LANE, KNEBWORTH | detached | £2,000,000 |
| Feb 2019 | 9A, STEVENAGE ROAD, KNEBWORTH | detached | £711,000 |
| Sept 2018 | 5E, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £285,000 |
| May 2017 | 5B, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £231,000 |
| Jul 2015 | 5D, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £148,750 |
| Jun 2015 | 5B, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £170,000 |
| Jan 2015 | 3E - 3F, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £135,000 |
| Dec 2013 | 5A, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £125,000 |
| Nov 2013 | 51, WATTON ROAD, KNEBWORTH | detached | £410,000 |
| Aug 2013 | 5C, STEVENAGE ROAD, KNEBWORTH | flat-maisonette | £125,000 |
| Dec 2011 | CHURCH HOUSE, 15, STEVENAGE ROAD, KNEBWORTH | detached | £652,500 |
Crime in SG3
24 reported crimes within a 1-mile radius of the postcode centroid in 2026-03, from Police UK data.
Anti Social Behaviour
9
Violent Crime
6
Burglary
2
Criminal Damage Arson
2
Shoplifting
2
Energy performance
Aggregate EPC stats from 133 recently-certified properties in the SG3 area.
Avg current score
63/100
Avg potential
79/100
Avg energy cost
£1,272/yr
Sample size
133
Rating distribution
A
0
B
1
C
52
D
63
E
12
F
3
G
2
Area information
- Local authority
- East Hertfordshire, North Hertfordshire, Welwyn Hatfield
- Country
- England
- Wards
- Aston, Datchworth & Walkern, Hertford Rural, Knebworth
- Constituency
- North East Hertfordshire
- Latitude
- 51.8603
- Longitude
- -0.1825
More for SG3
Typical property
What the typical SG3 property looks like
Area summary, buyer notes, researched facts
Sold prices tool
Full transaction history for SG3
HM Land Registry from 1995
Corporate freeholders
Companies registered in SG3
Live Companies House data + PSCs
EPC checker
Look up any SG3 address
Energy ratings + improvement options
Crime checker
Local breakdown for SG3
Police UK monthly data
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Get a Property ReportData sources & methodology
Sold prices: HM Land Registry Price Paid Data, the official UK government records updated monthly. Sample uses the 30 most recent registered transactions in the postcode area.
Crime: Police UK street-level crime data, covering a 1-mile radius from the SG3 postcode centroid for the most recent month available (typically 2 months behind). For Scottish postcodes we use Police Scotland recorded-crime counts published by the Scottish Government (2024-25), reported by council area.
EPC: opendatacommunities.org, the official Energy Performance Certificate register for England and Wales. Aggregate stats from up to 30 most recent certificates in the postcode. For Scottish postcodes we use Scottish EPC Register lodgements, aggregated to a council-level band distribution (Q2 2025 to Q1 2026). For Northern Ireland we use the NISRA Census 2021 EPC-band classification of every household, aggregated by council (Census 2021).
Area data: postcodes.io, open data from the Office for National Statistics.