BT20 postcode
Broadband in BT20 4HD
Castle, Ards and North Down
Superfast broadband covers 100% of premises here.
Free, independent comparison · Ofcom verified data · Updated 19 March 2026
Flood Risk
Medium
Fibre (FTTP)
No
Best speed
~30 Mbps
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.
The best available speed at BT20 4HD is ~30 Mbps. That covers your 14 Mbps estimate.
Speed Test
Check your current download speed and see how it compares to what is available at BT20 4HD.
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) | 100% | 100% | 10-20 Mbps |
| Superfast (30+ Mbps) | 100% | 100% | 30-80 Mbps |
| Ultrafast (100+ Mbps) | 0% | 0% | 100-300 Mbps |
| Full Fibre (FTTP) | N/A | N/A | 300-900 Mbps |
| Gigabit | 0% | 0% | 900-1,000 Mbps |
Speed Distribution at BT20 4HD
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: Medium
This postcode is in undefined — medium risk of flooding from rivers and sea.
Flood Zone
Risk Level
Medium
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 Ards and North Down
Most common: Band
Annual council tax estimates for , 2024/25
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Looking at BT20 4HD in Castle? Here is what the data says. From broadband coverage to crime rates, this is the full picture. All numbers are from official sources. The guide is updated as new data becomes available.
Superfast coverage here stands at 100%. Nationally, 93% of UK premises have access. Coverage at this postcode is strong.
The speed distribution at BT20 4HD tells a more detailed story than headline figures alone. 100% of connections fall in the 30 to 300 Mbps range. No premises here are stuck below 5 Mbps. Every property meets the basic threshold for video calls.
Translating the numbers at BT20 4HD into daily use gives a clearer picture. Most premises have superfast speeds. Remote working with video calls and cloud tools should be manageable for most households.
Fixed Wireless Access is not currently available at BT20 4HD. For properties without fibre, 4G or 5G home broadband from Three, EE, or Vodafone may be an alternative.
The USO guarantees every UK home at least 10 Mbps. At BT20 4HD, 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 100% of the area. NGA typically means speeds of 24 Mbps or above.
Flood risk at BT20 4HD is rated Medium. Check Environment Agency flood maps for detailed information. Specialist flood insurance may be needed.
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 BT20 4HD 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 BT20 4HD: remote working 55/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.
BT20 4HD falls within the Ards and North Down local authority area. The immediate area is Castle, a distinct community within the wider district. The BT20 postcode area contains 658 postcodes on this site. Superfast broadband across BT20 ranges from 86% to 100%. BT20 4HD is close to the area average of 100%.
How does BT20 4HD compare to its neighbours? BT20 4AF (0.02 miles, castle) has 100% superfast coverage and 87.5% gigabit. BT20 4AG (0.02 miles, harbour) has 86.4% superfast coverage and 59.1% gigabit. BT20 4ST (0.03 miles, castle) has 100% superfast coverage and 100% gigabit. BT20 5AP (0.03 miles, harbour) has 100% superfast coverage and 0% gigabit. Coverage is broadly similar across these neighbouring postcodes.
Not every property at BT20 4HD gets the same speeds. Run a postcode check with each provider before signing up. Headline speeds are not guarantees. 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.
Castle offers a mix of residential properties and local amenities. The character of any area is best judged in person.
What does all of this mean for someone considering BT20 4HD? Connectivity at BT20 4HD is a strength. Strong broadband coverage gives flexibility for both working and leisure. The area scores well on that front. Ards and North Down 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.
Before making a decision about BT20 4HD, visit in person. Check the commute at rush hour. Try the mobile signal indoors. Look at local shops and green spaces. Ask about broadband reliability, not just speed. Data sets the scene, but real life fills in the gaps.
BT20 4HD 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 BT20 4HD
What are the broadband speeds available at BT20 4HD?
Superfast broadband (30 Mbps+) is available to 100% of premises at BT20 4HD.
What is the average house price near BT20 4HD?
No recent house price data is available for BT20 4HD.
What is the flood risk for properties at BT20 4HD?
BT20 4HD has a Medium flood risk rating. Check Environment Agency maps for detail.
What schools are nearby in the BT20 4HD area?
School data for BT20 4HD is being updated. Check the Get Information About Schools service for the latest.
How does crime rate in BT20 4HD compare to other areas?
Crime data for this area is being updated.
How suitable is BT20 4HD for remote working?
BT20 4HD scores 55/100 for remote working suitability. Speeds may limit video-heavy workflows.
What is the mobile signal like at BT20 4HD?
4G outdoor coverage at BT20 4HD is 95%. Indoor coverage may be lower.
What is the most common energy efficiency rating near BT20 4HD?
EPC data for BT20 4HD is being updated. Check the EPC register for individual property ratings.
What is the council tax band distribution at BT20 4HD?
Council tax band information for BT20 4HD is being updated.
How accessible are GP surgeries near BT20 4HD?
GP surgery data for BT20 4HD is being updated. Check NHS.uk for the latest.
What transport links are available near BT20 4HD?
Transport data for BT20 4HD is being updated.
Is BT20 4HD a suitable area for families?
BT20 4HD scores 50/100 for family suitability. Check school and crime sections above for detail.
What is the air quality like at BT20 4HD?
Air quality data for BT20 4HD is being updated.
How far is the nearest EV charging point from BT20 4HD?
EV charging data for BT20 4HD is being updated. Check Zap-Map for the latest.
Can I get full fibre broadband at BT20 4HD?
Full fibre availability at BT20 4HD is being updated. Check Openreach for the latest rollout status.
Area suitability scores
BT20 4HDRemote Worker
55Based 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
Ards and North Down
Region
Constituency
LSOA
N21000820
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