SA31 postcode area guide — Carmarthenshire
House prices, crime, broadband speeds, mobile signal, schools and demographics for the SA31 postcode district in Carmarthenshire — every official dataset on one page.
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Where is SA31?
Broadband & internet speeds in SA31
Strong coverage
Superfast (30Mb+)
96.7%
Ultrafast (300Mb+)
73.3%
Gigabit-capable
73.3%
Below USO (10Mb)
0.2%
Broadband availability in the SA31 postcode district (Carmarthenshire) is Strong — superfast is near-universal and gigabit is rolling out. Across the 558 postcodes Ofcom measures in SA31, superfast broadband (30 Mbit/s or faster) reaches 96.7% of premises and gigabit-capable lines are available to 73.3%.
Around 0.2% of premises in SA31 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 SA31
| Postcode | Superfast | Gigabit |
|---|---|---|
| SA31 1AA | 100% | 0% |
| SA31 1AD | 100% | 0% |
| SA31 1AF | 100% | 0% |
| SA31 1AG | 100% | 0% |
| SA31 1AH | 100% | 100% |
| SA31 1AN | 100% | 0% |
| SA31 1AS | 100% | 100% |
| SA31 1AW | 100% | 100% |
| SA31 1BA | 100% | 0% |
| SA31 1BD | 100% | 12.5% |
Run a speed test to see what you're actually getting, or check your exact postcode.
Mobile signal around Carmarthenshire
Ofcom's coverage model for the wider Carmarthenshire district (95,165 premises):
4G indoors — all networks
80.3%
4G outdoors — all networks
95.7%
5G outdoors — all networks
—
Voice indoors — all networks
83%
Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.
House prices in SA31
Based on 189 sales registered with HM Land Registry in the last 12 months, the median sold price in SA31 is £193,000, down 8.7% on the previous year (£211,500).
Detached
£307,500
57 sales
Semi-detached
£200,000
46 sales
Terraced
£150,000
64 sales
Flat / maisonette
£124,000
10 sales
Latest recorded sales in SA31
| Date | Price | Type | Street | Postcode |
|---|---|---|---|---|
| 22 May 2026 | £210,000 | Terraced | Ismyrddin | SA31 2JE |
| 18 May 2026 | £215,000 | Semi-detached | Maes Elen | SA31 3FB |
| 12 May 2026 | £87,000 | Terraced | Fountain Hall Terrace | SA31 1RW |
| 8 May 2026 | £140,000 | Terraced | Richmond Terrace | SA31 1HE |
| 8 May 2026 | £250,000 | Semi-detached | Myrddin Crescent | SA31 1DX |
| 7 May 2026 | £235,000 | Detached | Lon Y Plas | SA31 3NJ |
| 30 Apr 2026 | £115,000 | Semi-detached | Prosser Close | SA31 1JB |
| 30 Apr 2026 | £230,000 | Detached | Allt Ioan | SA31 3SB |
| 30 Apr 2026 | £285,000 | Detached | Parcydelyn | SA31 1TS |
| 30 Apr 2026 | £225,000 | Semi-detached | Maes Pedr | SA31 3BR |
Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.
Who lives here? Carmarthenshire demographics
Census 2021 figures for the wider Carmarthenshire district (187,897 residents, 81,759 households):
| Age profile | |
|---|---|
| Under 15 | 17.3% |
| 15–29 | 19.9% |
| 30–44 | 16.9% |
| 45–64 | 21.8% |
| 65+ | 24.2% |
| Housing tenure | |
|---|---|
| Owner-occupied | 70.4% |
| Private rented | 15% |
| Social rented | 3.9% |
Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.
Schools in and around SA31
| School | Phase | Ages | Pupils | Postcode |
|---|---|---|---|---|
| Johnstown C.P. School | Not applicable | — | — | SA31 3HS |
| Ysgol y Dderwen | Not applicable | — | — | SA31 1TG |
| Myrddin C.P. School | Not applicable | — | — | SA31 1TE |
| Llangunnor CP | Not applicable | — | — | SA31 2NN |
| Richmond Park Primary School | Not applicable | — | — | SA31 1HF |
| Abergwili VCP | Not applicable | — | — | SA31 2JD |
| St Mary's R.C. Primary School | Not applicable | — | — | SA31 3DE |
| Model C.I.W. School | Not applicable | — | — | SA31 3EQ |
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 SA31
261 rated food businesses operate in SA31. 210 hold the top rating of 5, 24 are rated 4, and 3 are rated 2 or below.
Among the 5-rated: ABERGWILI PRIMARY SCHOOL, Adref Cafe & Bar, ALBERT REES, Aldi GMBH, Andrew Davies - Wild Game.
Source: Food Standards Agency, food hygiene ratings (FHRS) open data.
Energy performance (EPC) in SA31
From a sample of 109 Energy Performance Certificates across 9 SA31 postcodes, the most common rating is band D (average band D). 41% of sampled homes are rated C or better.
Band B
8%
Band C
33%
Band D
36%
Band E
15%
Band F
5%
Band G
4%
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 Carmarthenshire
Landlines around SA31 typically use:
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What's it like living in SA31?
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Moving to SA31? Sort your connectivity first
We arrange broadband, full-fibre, leased lines, VoIP and business mobiles across Carmarthenshire — free, no-obligation quote.
Postcodes in SA31
Neighbouring districts
All Swansea (SA) postcode districts ›
Frequently asked questions
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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.