SA40 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 106 postcodes across 1 sector in Carmarthenshire.
Gigabit
53%
Superfast
74%
Postcodes
106
SA40 covers 106 postcodes in Carmarthenshire with moderate connectivity at the district level but higher-than-average gaps. One in fourteen postcodes miss Universal Service Obligation standards.
Broadband speeds in SA40
Share of SA40 premises by the fastest download speed available, averaged across all 106 postcodes in the district.
74.2% achieve superfast coverage, respectable but not exceptional for a Carmarthenshire district. Gigabit reaches 53.2%, leaving the majority of postcodes in the 30 to 300 Mbps window. That band itself spans 21% of the sample, suggesting a mix of mid-age copper and early fibre without unified modern upgrade. The trouble spot is significant: 13.5% of postcodes dip below 10 Mbps, markedly higher than better-connected areas and a material barrier for remote work or streaming. At 7.2%, the share falling short of Universal Service Obligation thresholds is the highest concentration in this cluster, meaning a material minority of premises face formal access guarantees and potential cost barriers. Speed distribution across this district shows real stratification by location and infrastructure age.
Source: Ofcom Connected Nations. Percentages are district-wide averages of postcode-level availability, so rows may not sum to exactly 100%.
Connectivity in detail
Below 10 Mbps USO
7%
Premises unable to get the 10 Mbps universal service minimum
Fixed wireless
<1%
Premises that can use a fixed wireless access service
Broadband by sector
SA40 splits into 1 postcode sector. Coverage and prices can differ street by street, so open a sector below to find your exact postcode.
| Sector | Postcodes | Superfast | Full fibre | Gigabit |
|---|---|---|---|---|
| SA40 9 | 106 | 74% | TBC | 53% |
All SA40 9 postcodes (106)
Best deals
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Living in Carmarthenshire
With 106 postcodes, SA40 is smaller than SA4 but large enough to show real stratification. The 53.2% gigabit figure is solid but not exceptional, and the 13.5% below 10 Mbps tail is a red flag that distance or infrastructure neglect is playing a role.
Remote worker score
49/100
Connectivity and amenities for home working
Family score
50/100
Schools, safety and family amenities
Value score
50/100
What you get for the local price level
SA40 broadband FAQs
What does 7.2% missing Universal Service Obligation mean for SA40 residents?
A small but material portion of postcodes don't meet minimum standards. If you're in one, Ofcom guarantees access to a service delivering at least 10 Mbps, but costs and delays can apply.
Why does SA40 have a larger below-10Mbps tail than other postcodes here?
13.5% suggests a cluster of premises far from exchange infrastructure, possibly scattered rural locations or areas awaiting fibre rollout.
Is gigabit a realistic expectation in SA40?
53.2% of postcodes qualify, so it's common but not majority-standard. Check your specific address before planning gigabit-dependent work.
How does SA40 rank within Carmarthenshire?
At 53.2% gigabit, it's moderate compared to other county postcodes, showing geographic variation in fibre deployment.
Neighbouring districts
Check your exact postcode
Every postcode in SA40 has its own page with broadband speeds, house prices, school ratings and crime stats. You can also compare providers for your address.
Data sources: Broadband data from Ofcom Connected Nations 2025 · House prices from HM Land Registry · Crime from Police.uk · See all data sources