SG1 postcode district: Stevenage and around, Hertfordshire
SG1 is a postcode district in Hertfordshire, with 1,284 postcodes in use in 7 sectors. It has postcodes in Stevenage. It is split between 2 councils: Stevenage (1,216 postcodes) and North Hertfordshire (68).
- Postcodes in use
- 1,284
- Sectors
- 7
- Councils
- 2 councils
- Places
- Stevenage
Source: ONS Postcode Directory, August 2026, loaded 20 October 2026.
Every postcode in SG1, by gigabit broadband
- No home or business can get gigabit: 166
- Some can get gigabit: 121
- Every home and business can get gigabit: 898
- Ofcom gives no figure: 99
- Outline: where 5 or more postcodes without gigabit lie together
Of the 1,284 postcodes in SG1 that ONS places, 166 have no home or business that can get gigabit, 121 have some that can, 898 can all get it and 99 have no Ofcom figure.
Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.
The middle of its postcodes: latitude 51.9133, longitude -0.1956. Open this area on OpenStreetMap
Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre.
Postcodes without gigabit
166 postcodes here have no gigabit. These are the 12 first in postcode order.
Where the postcodes without gigabit lie together
- 36 postcodes without gigabit, outlined on the map. SG1 1DN, is the one nearest the middle of them.
- 16 postcodes without gigabit, outlined on the map. SG1 3SS, is the one nearest the middle of them.
- 15 postcodes without gigabit, outlined on the map. SG1 2NG, is the one nearest the middle of them.
- 10 postcodes without gigabit, outlined on the map. SG1 2UR, is the one nearest the middle of them.
- 10 postcodes without gigabit, outlined on the map. SG1 3QD, is the one nearest the middle of them.
- 8 postcodes without gigabit, outlined on the map. SG1 4GJ, is the one nearest the middle of them.
What broadband can you get in SG1?
Ofcom reports on 1,185 of the 1,284 postcodes in SG1. At 898 of them every home and business can get gigabit broadband.
Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.
Check one address on Ofcom's checkerSource: Ofcom Connected Nations, Connected Nations, Spring 2026, data for January 2026.
Is SG1 at risk of flooding?
19 of the 1,284 postcodes in SG1 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 2 homes and businesses in an area at high or medium risk.
High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.
Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.
Source: Environment Agency flood risk, published 6 July 2026.
What do homes sell for in SG1?
Homes in SG1 sold for a typical £350,000 in the 12 months to September 2026, across 478 sales, HM Land Registry's figures show. The 12 months before gave £350,000 from 663 sales: not a change larger than chance would explain, given which homes happened to sell.
- Detached £580,000 60 sales
- Semi-detached £425,000 97 sales
- Terraced £340,000 220 sales
- Flat or maisonette £205,000 101 sales
Each bar is that kind's typical price, against the most expensive kind here.
Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.
Source: HM Land Registry Price Paid Data, files dated 28 October 2026.
Postcodes in SG1
Pick a sector, then a postcode. A sector is the district plus the next digit.
Places in SG1
Towns and villages with postcodes in SG1, and how many each has here.
Who covers SG1
How many of the district's postcodes in use fall under each council, constituency and police force area.
Councils
- Stevenage1,216
- North Hertfordshire68
Constituencies
- Stevenage1,216
- Hitchin68
Police force areas
- Hertfordshire1,284
Next to SG1
"Next to" is by number: the district after SG1 in the SG area.
Check a postcode
Where the facts on this page come from
- Office for National Statistics: ONS Postcode Directory
- Ofcom Connected Nations
- Environment Agency flood risk
- HM Land Registry Price Paid Data
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0.
Licence: Open Government Licence v3.0.
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