SA1 postcode
Broadband in SA1 3LZ
Castle, Swansea
Gigabit broadband is available at this postcode.
Free, independent comparison · Ofcom verified data · Updated 3 March 2026
Flood Risk
Low
Fibre (FTTP)
No
Best speed
Gigabit (1Gbps+)
Speed Calculator
Adjust the options below to see how much broadband speed your household needs.
HD uses ~5 Mbps per person. 4K uses ~25 Mbps.
Each person on calls needs around 10 Mbps.
Competitive gaming needs low latency as much as raw speed.
Cameras, thermostats, speakers and similar devices each use a few Mbps.
Gigabit broadband (Gigabit (1Gbps+)) is available at SA1 3LZ. That covers your 14 Mbps needs with room to spare.
Speed Test
Check your current download speed and see how it compares to what is available at SA1 3LZ.
The test downloads a 2 MB file from our server and measures how long it takes.
This test measures download speed only. Results vary depending on network conditions.
Broadband availability
Source: Ofcom Connected Nations 2025 (Jul 2025)
| Technology | Available | Coverage | Typical Speed |
|---|---|---|---|
| Standard (ADSL) | 89% | 89% | 10-20 Mbps |
| Superfast (30+ Mbps) | 89% | 89% | 30-80 Mbps |
| Ultrafast (100+ Mbps) | 78% | 78% | 100-300 Mbps |
| Full Fibre (FTTP) | N/A | N/A | 300-900 Mbps |
| Gigabit | 78% | 78% | 900-1,000 Mbps |
Speed Distribution at SA1 3LZ
Source: Ofcom Connected Nations 2025
Mobile coverage
4G & 5G coverage · Ofcom Connected Nations 2025
4G Outdoor
4G Indoor
5G Outdoor
Networks with 4G
Schools nearby
Nearest schools within 5 miles · Ofsted ratings as at Jan 2026
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Flood risk
🟡
Flood risk: Low
This postcode is in undefined — low risk of flooding from rivers and sea.
Flood Zone
Risk Level
Low
Air quality
Particulate matter & nitrogen dioxide levels
air quality
Air quality data not available.
WHO guideline: 15 μg/m³
WHO guideline: 45 μg/m³
WHO guideline: 25 μg/m³
Transport links
Nearest train stations and towns
Nearest train stations
No train stations found within 15 miles
Council tax bands
Band distribution for Swansea
Most common: Band
Annual council tax estimates for , 2024/25
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Check Deals →Living near SA1 3LZ
Castle is home to SA1 3LZ. Whether you live here or plan to move, the data below paints a clear picture. Broadband, schools, crime, house prices, and local services all follow. The numbers speak for themselves.
Superfast broadband (30 Mbps+) coverage at SA1 3LZ stands at 88.9%. That is close to the UK average of 93%. Ultrafast broadband (100 Mbps+) reaches 77.8% of properties. Over half of premises have access to faster tiers. Gigabit-capable connections cover 77.8% of premises. Gigabit is available but not yet widespread at this postcode.
The speed distribution at SA1 3LZ tells a more detailed story than headline figures alone. 11.1% of connections fall in the 30 to 300 Mbps range. 77.8% of connections fall in the 300 Mbps or faster range. No premises here are stuck below 5 Mbps. Every property meets the basic threshold for video calls. Over half of connections exceed 300 Mbps. That supports multiple 4K streams, large file transfers, and cloud gaming without issue.
What do the broadband speeds at SA1 3LZ mean in practice? Most premises have superfast speeds. Remote working with video calls and cloud tools should be manageable for most households.
FWA broadband has not reached SA1 3LZ yet. Satellite services like Starlink or 4G home broadband routers can fill the gap where fixed-line options are limited.
The USO guarantees every UK home at least 10 Mbps. At SA1 3LZ, 0% of properties do not meet this threshold. Every property here meets the minimum standard. That is not the case everywhere. Next-generation access (NGA) reaches 88.9% of the area. NGA typically means speeds of 24 Mbps or above.
Flood risk at SA1 3LZ is rated Low. Minor precautions may be worth considering. Check with insurers about any loading on premiums.
The three most common bands are D (25%), C (20%), E (20%). Band D corresponds to 1991 property values of £68,001 to £88,000. Current values are typically much higher. The spread across mid-range bands suggests a varied housing stock.
4G outdoor coverage at SA1 3LZ reaches 95%. Indoor 4G drops to 85%. Some signal loss indoors is normal. Most calls and data should still work inside. Coverage data covers EE, O2, Three, Vodafone. Check each operator individually, as coverage varies by network.
Suitability scores for SA1 3LZ: remote working 50/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.
The local authority for SA1 3LZ is Swansea. The immediate area is Castle, a distinct community within the wider district. The SA1 postcode area contains 1195 postcodes on this site. Superfast broadband across SA1 ranges from 0% to 100%. SA1 3LZ is below the area average of 98%.
How does SA1 3LZ compare to its neighbours? SA1 3NE (0.04 miles, castle) has 100% superfast coverage and 100% gigabit. SA1 1ED (0.04 miles, castle) has 100% superfast coverage and 100% gigabit. SA1 1SN (0.06 miles, waterfront) has 100% superfast coverage and 100% gigabit. Neighbouring postcodes tend to have better superfast coverage.
Broadband availability varies by provider and by property. At SA1 3LZ, check individual coverage tools from BT, Sky, Virgin Media, and local operators. If fibre is unavailable, consider 4G home broadband or satellite as alternatives. Speeds may still be adequate for most uses. Compare contract lengths, total costs over the term, and exit fees. The cheapest monthly rate is not always the best deal.
Every part of Castle has its own feel. This data gives you the factual starting point. A visit fills in the rest.
Pulling the data together for SA1 3LZ, here is what stands out. Swansea as a local authority area has its own planning priorities, council services, and infrastructure investment plans. Check the council website for the latest. The data covers what can be measured. Castle has its own character that numbers alone cannot capture. Use these figures as a filter, then visit to get the full picture.
Data sources include Ofcom (broadband and mobile), Land Registry (house prices), Police.uk (crime), Ofsted (schools), Environment Agency (flood risk), and Open-Meteo (air quality). Council tax data comes from the Valuation Office Agency. EPC data is from DLUHC. Transport data uses NaPTAN. Speed distribution figures are from Ofcom Connected Nations. All figures are the latest available at the time of writing.
Numbers tell part of the story for SA1 3LZ. Visit at different times of day. Talk to neighbours. Check mobile signal indoors. Walk the route to the nearest school or station. Test the broadband speed from inside the property. These things do not show up in data.
SA1 3LZ in Castle: broadband, house prices, crime, schools, and more. All from verified sources. Run a speed test above for a live reading. Compare with nearby postcodes to see how this area stacks up against its neighbours.
More local data is being added for this postcode
This page already has postcode-specific content, and more data-backed sections will appear as the remaining local datasets finish processing.
Frequently asked questions about SA1 3LZ
What are the broadband speeds available at SA1 3LZ?
Superfast broadband (30 Mbps+) is available to 88.9% of premises at SA1 3LZ. Ultrafast coverage is at 77.8%.
What is the average house price near SA1 3LZ?
No recent house price data is available for SA1 3LZ.
What is the flood risk for properties at SA1 3LZ?
SA1 3LZ has a Low flood risk rating. Check Environment Agency maps for detail.
What schools are nearby in the SA1 3LZ area?
School data for SA1 3LZ is being updated. Check the Get Information About Schools service for the latest.
How does crime rate in SA1 3LZ compare to other areas?
Crime data for this area is being updated.
How suitable is SA1 3LZ for remote working?
SA1 3LZ scores 50/100 for remote working suitability. Speeds may limit video-heavy workflows.
What is the mobile signal like at SA1 3LZ?
4G outdoor coverage at SA1 3LZ is 95%. Indoor coverage may be lower.
What is the most common energy efficiency rating near SA1 3LZ?
EPC data for SA1 3LZ is being updated. Check the EPC register for individual property ratings.
What is the council tax band distribution at SA1 3LZ?
Council tax band information for SA1 3LZ is being updated.
How accessible are GP surgeries near SA1 3LZ?
GP surgery data for SA1 3LZ is being updated. Check NHS.uk for the latest.
What transport links are available near SA1 3LZ?
Transport data for SA1 3LZ is being updated.
Is SA1 3LZ a suitable area for families?
SA1 3LZ scores 50/100 for family suitability. Check school and crime sections above for detail.
What is the air quality like at SA1 3LZ?
Air quality data for SA1 3LZ is being updated.
How far is the nearest EV charging point from SA1 3LZ?
EV charging data for SA1 3LZ is being updated. Check Zap-Map for the latest.
Can I get full fibre broadband at SA1 3LZ?
Ultrafast broadband (100 Mbps+) reaches 77.8% of premises. Check Openreach and local operators for FTTP availability.
Area suitability scores
SA1 3LZRemote Worker
50Based on superfast broadband coverage, FTTP %, and 4G mobile outdoor coverage.
Family
50Based on Ofsted school ratings, crime rate, flood risk, and GP surgery proximity.
Value for Money
50Based on broadband quality relative to average house price in the area.
Map
Area info
Parish
Castle
District
Swansea
Region
Constituency
LSOA
W01001955
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