What Is ADSL Broadband? Standard Broadband Explained (2026)

ADSL is asymmetric digital subscriber line broadband that runs entirely over copper telephone wires from the exchange to your home. Maximum speeds reach 24 Mbps download and 1 Mbps upload, though most households receive 8–12 Mbps depending on distance from the exchange. ADSL is being phased out as the PSTN switch-off in January 2027 approaches and FTTP coverage reaches 82% of UK premises.

How ADSL Works and Its Limitations

ADSL uses the copper telephone line running from your local exchange directly to your home to carry broadband data alongside voice signals. A microfilter or splitter separates the broadband and phone signals at the socket. The maximum download speed on ADSL2+ is 24 Mbps, but real-world performance depends almost entirely on the length and quality of the copper line. Homes within 1 km of the exchange may achieve 15–20 Mbps, while those 3 km away often receive below 5 Mbps. Upload speeds cap at just 1 Mbps, making ADSL unsuitable for video conferencing or uploading large files. Electrical interference from household appliances and aging internal wiring further degrade signal quality. Plusnet still offers ADSL packages from around £22 per month, but with FTTC available to 96% of UK premises and FTTP at 82%, ADSL is increasingly obsolete. Ofcom reports that fewer than 8% of UK households remain on ADSL-only connections as of 2025.

ADSL Speeds Compared to Fibre

The performance gap between ADSL and fibre broadband is enormous. ADSL maxes out at 24 Mbps download under ideal conditions, while FTTC delivers up to 80 Mbps and FTTP reaches 1.8 Gbps. The UK average broadband speed of 157 Mbps is nearly seven times faster than the best ADSL can manage. For basic browsing and email, ADSL may still function, but streaming even a single 4K video requires 25 Mbps, already exceeding ADSL's theoretical maximum. Sky Broadband has largely migrated its customer base away from ADSL, pushing Superfast FTTC as the entry tier. TalkTalk phased out standalone ADSL sales for new customers in 2024. If your household includes multiple users or any smart home devices, ADSL's 1 Mbps upload creates a significant bottleneck. Online gaming on ADSL typically produces latency of 30–50 ms, noticeably worse than the sub-15 ms achievable on FTTP.

The PSTN Switch-Off and ADSL's Future

The Public Switched Telephone Network switch-off, scheduled for January 2027, will retire the copper infrastructure that ADSL depends on. Openreach has already begun stop-sell orders in exchange areas where FTTP is available, meaning new ADSL connections can no longer be ordered in those locations. By December 2025, over 450 exchanges had been flagged for stop-sell, covering millions of premises. Existing ADSL customers in these areas will be migrated to FTTP or FTTC alternatives before the copper network is decommissioned. BT is actively contacting ADSL customers to offer upgrade paths, typically to its FTTP Fibre Essential package at 36 Mbps. Vodafone runs trade-in campaigns offering FTTP from £25 per month with no setup fees for customers switching from ADSL. If you are still on ADSL, upgrading sooner rather than later is advisable, as demand for installation slots intensifies as the January 2027 deadline approaches.

How to Upgrade from ADSL

Upgrading from ADSL to fibre is straightforward with the One Touch Switch process introduced by Ofcom. You simply sign up with your new provider and they handle the switch, including cancelling your old ADSL service. The entire process takes around 10–14 working days. EE offers FTTP packages starting at 36 Mbps with a mobile data backup feature, ensuring connectivity even during installation. NOW Broadband provides a budget-friendly FTTC option from approximately £22 per month with average speeds of 36 Mbps, a significant jump from typical ADSL performance. For rural premises where fibre is unavailable, 5G home broadband from providers like Vodafone and Three offers an alternative, delivering 100–300 Mbps wirelessly. Zen Internet specialises in reliable FTTP for users who need consistent performance without traffic management. Before switching, run a speed test on your current ADSL connection to benchmark the improvement. Over 1.6 million UK households used One Touch Switch in its first year of operation.

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Frequently Asked Questions

Can I still get ADSL broadband?

ADSL is still available in some areas, but Openreach has placed stop-sell orders on exchanges where FTTP is live. Most providers have stopped selling standalone ADSL to new customers. If ADSL is your only option, check whether 4G or 5G home broadband could provide faster speeds at your location.

Is ADSL fast enough for streaming?

ADSL can handle standard definition streaming at 5 Mbps per device, but 4K streaming requires 25 Mbps, which exceeds ADSL's maximum in most real-world conditions. If you stream regularly, upgrading to FTTC or FTTP delivers a far better experience with no buffering.

What is the difference between ADSL and ADSL2+?

ADSL supports maximum download speeds of 8 Mbps, while ADSL2+ doubled the frequency range to achieve up to 24 Mbps. Both use the same copper telephone line. Nearly all remaining ADSL connections in the UK are ADSL2+, as the original ADSL standard has been superseded.

Related Guides

What Is FTTC Broadband? · What Is FTTP Broadband? · PSTN Switch-Off Explained · Types of Broadband UK

Methodology & Sources

Information in this guide is sourced from Ofcom market reports, Openreach coverage data, ISPreview.co.uk, provider websites and independent broadband research from Point Topic and Thinkbroadband. Prices and availability are checked monthly. Speed data reflects advertised average speeds from provider Key Facts documents.