4th Utility broadband deals: apartment-block altnet with CityFibre expansion
4th Utility is an alternative-network full-fibre operator specialising in apartment blocks, new-build developments, and purpose-built urban schemes. Rather than building street-by-street like most altnets, 4th Utility partners directly with property developers and building managers to wire fibre into apartment buildings at construction or retrofit, combined with a CityFibre wholesale partnership that extends coverage to approximately 4.7 million UK premises including additional urban areas. Symmetric speeds from 100 Mbps to 2.3 Gbps, unlimited data on all plans, free installation on 12-month and 24-month contracts, Icotera Wi-Fi 5 router included, and a social tariff that in some apartment arrangements extends block-wide rather than per-household. This page is the honest take on when 4th Utility is the simplest route to full-fibre broadband for apartment residents and new-build home buyers, plus the important editorial point: unlike toob, Zen, BeFibre, or YouFibre which commit to zero mid-contract price rises, 4th Utility applies a £3 per month annual March price rise during the contract term, disclosed upfront in pounds and pence consistent with Ofcom's rule change.
Apartment-block and new-build specialist
4th Utility partners with property developers to install fibre directly into apartment blocks, new-build developments, and purpose-built urban schemes at construction or retrofit. Fibre is already in place when residents move in.
CityFibre wholesale partnership
Beyond its own-network apartment build, 4th Utility retails over CityFibre's approximately 4.7 million UK premises, extending coverage to urban areas such as London, Birmingham, Manchester, and additional CityFibre-served cities.
Symmetric speeds 100 Mbps to 2.3 Gbps
Consumer plans run across 100, 150, 200, 250, 300, 500, 900 Mbps tiers with a 1 Gbps and 2.3 Gbps multi-gig tier available on CityFibre multi-gigabit areas. All symmetric: upload matches download.
Flexible contract lengths
Contracts at 6 months, 12 months, 24 months, or 30-day rolling. 30-day rolling costs more per month and may include a small activation fee but offers genuine flexibility (rare among UK altnets).
Social tariff with block-wide arrangements
Social tariff for households on Universal Credit, Jobseekers Allowance, Income Support, or Pension Credit. In some apartment block arrangements, eligibility extends to all residents within the block without individual documentation.
£3/mo annual March price rise applies
4th Utility's fixed-term contracts include a £3 per month increase every March during contract. Disclosed upfront per Ofcom's 17 January 2025 rule. Smaller than BT's £4/mo but real. Toob, Zen, BeFibre, YouFibre commit to £0 mid-contract rises.
See live 4th Utility deals at your address
4th Utility's coverage depends on whether your building is wired for its own network or in a CityFibre-partnered city. Apartment residents should check with building managers too; fibre may already be in place. Run the postcode check first.
Compare 4th Utility dealsWhat 4th Utility actually is: apartment-block altnet
4th Utility (legally "The 4th Utility Ltd") is an alternative-network full-fibre operator with a deliberately distinct approach from most UK altnets. Rather than building street-by-street across whole towns like BeFibre, YouFibre, or toob, 4th Utility partners directly with property developers and building managers to wire fibre into specific apartment blocks, new-build developments, and purpose-built urban schemes at construction time or through retrofit. The brand positions broadband as "the fourth utility" alongside gas, electricity, and water, a deliberately basic, always-available service that should be wired into buildings as standard infrastructure rather than added later. Beyond its own-network build, 4th Utility retails over CityFibre's wholesale network (approximately 4.7 million UK premises) to extend coverage into additional urban areas.
Where 4th Utility operates
- Own-network apartment blocks and new-builds: specific buildings and developments across UK urban areas where 4th Utility has partnered with developers or building managers. Typically these are purpose-built apartment blocks, modern housing schemes, and student accommodation blocks.
- CityFibre wholesale expansion: approximately 4.7 million UK premises including London, Birmingham, Manchester, and additional CityFibre-served urban areas. 4th Utility is one of several retail ISPs on CityFibre alongside Vodafone, TalkTalk, Zen, toob, and others.
- Technology: 100% FTTP full fibre with symmetric speeds on every consumer tier. Copper-free, landline-free last mile.
- Coverage check: always run the postcode check plus confirm with your building manager (if apartment) whether 4th Utility is already wired in.
How 4th Utility differs from street-by-street altnets
- Building-by-building rollout: coverage is decided at the property level through developer partnerships rather than by street. Two adjacent apartment buildings may have completely different availability.
- Built-in at construction: for new-build developments, 4th Utility is often wired in before residents move in, which means no delay or installation visit required.
- Compare with Hyperoptic: Hyperoptic is the larger apartment-focused altnet nationwide; 4th Utility fills similar role in buildings outside Hyperoptic's reach and in specific developer-partnered schemes.
- Compare with Community Fibre (London only): Community Fibre often has faster top speeds and better pricing for London residents; 4th Utility fills similar apartment-block role outside London.
- Compare with toob: toob builds street-by-street across South Coast Hampshire and CityFibre cities; 4th Utility builds building-by-building with CityFibre extension. Different rollout models, both using CityFibre wholesale for expansion.
The editorial honest take. 4th Utility's developer-partnership model is editorially distinct and practically useful: for apartment residents and new-build home buyers whose building already has 4th Utility wired in, the friction of ordering broadband is genuinely lower than at many alternatives. The trade-off is that coverage is completely address-specific and you cannot predict availability from street-level data alone; check with your building manager if possible. For CityFibre cities outside the own-network apartment footprint, 4th Utility becomes effectively one of several retail ISPs on CityFibre, with its apartment-origin brand identity less relevant.
4th Utility speed tiers and typical prices
4th Utility's pricing is more complex than most UK altnets because it spans multiple speed tiers, multiple contract lengths, and mixes its own-network build with CityFibre wholesale pricing. Typical April 2026 pricing is shown below. The 6-month promo pricing applies for the first 6 months of 6-month, 12-month, or 24-month contracts, with a step-up to the ongoing rate thereafter. All tiers are symmetric.
| Tier | Download / upload | Typical promo price | Typical ongoing price (after promo) |
|---|---|---|---|
| 100 Mbps | 100 / 100 Mbps | From around £18/mo (fixed pricing promo until March 2027 on some terms) | Steps up after promo period |
| 150 Mbps | 150 / 150 Mbps | Around £26/mo for 6 months | Around £36/mo thereafter |
| 200 Mbps | 200 / 200 Mbps | Around £29/mo for 6 months | Around £39/mo thereafter |
| 250 Mbps | 250 / 250 Mbps | Around £21/mo for 6 months (£23 for 12 months) | Around £31/mo (£37 on 12-month) |
| 500 Mbps | 500 / 500 Mbps | Around £32/mo for 6 months | Around £42/mo thereafter |
| 900 Mbps | 900 / 900 Mbps | Around £34/mo for 6 months | Around £44/mo thereafter |
| 1 Gbps | 1000 / 1000 Mbps | Around £21/mo for 12 months | Around £30/mo thereafter |
| 2.3 Gbps | 2300 / 2300 Mbps (CityFibre multi-gig) | Around £33/mo for 12 months | Around £47/mo thereafter |
The highlighted 500 Mbps tier is where the value case is strongest on longer contracts for typical households. Symmetric half-gigabit at around £32/mo for the first 6 months, stepping to £42/mo thereafter, plus the £3/mo March rise during contract. The tier at approximately £21/mo 6-month promo on 250 Mbps is another notable value point if you can tolerate the speed step-down. Free installation and activation apply on 12-month and 24-month contracts; the 30-day rolling option carries a small activation fee and higher monthly rate but provides genuine flexibility.
The router included as standard is the Icotera i4850-25, a Wi-Fi 5 dual-band device with four gigabit Ethernet ports. It handles gigabit-class speeds well over wired connections but is a basic Wi-Fi router compared to the Linksys Wi-Fi 6 mesh at toob, the Wi-Fi 7 routers at BeFibre Be900/Be2300, or the eero Pro 6E at Cuckoo. For power users, 4th Utility offers a separate bridge device plus PPPoE credentials so you can use your own router; ask at order. Unlimited data applies on every tier, with no fair-use policy or peak throttling.
Price rise honesty: the £3 annual March rise
An important editorial point handled directly rather than buried. Some third-party broadband reviews describe 4th Utility using phrases like "competitive pricing" without explaining the annual increase structure. The most accurate source is 4th Utility's own terms, which set out explicitly: fixed-term contracts include a £3 per month increase every March during minimum contract term. Compared against the broader UK market, this is an important differentiator that affects your real total contract cost.
4th Utility price-rise terms
- Fixed-term contracts include a £3/mo increase every March during the minimum term.
- Increases are disclosed upfront in pounds and pence, consistent with Ofcom's 17 January 2025 rule change banning inflation-linked percentage rises.
- Some variable-price deals sold via comparison sites handle rises differently, often with penalty-free exit if an un-specified increase is applied.
- 30-day rolling contracts do not have the minimum-term rise but carry a higher monthly rate from signup.
- Post-contract (out-of-contract) pricing steps up further.
How that compares across rivals
- Toob, Zen, BeFibre, YouFibre: £0 mid-contract rises. Absolute fixed price for contract term.
- Community Fibre: £2/mo annual rise (lowest disclosed among UK majors).
- 4th Utility: £3/mo annual March rise.
- Cuckoo: £3/year increase (similar effective impact to 4th Utility).
- NOW Broadband: £3/mo annual rise.
- Vodafone: £3.50/mo annual rise.
- BT, EE, Sky, TalkTalk: £3-£4/mo annual rises.
The practical arithmetic worth stating out loud. On a 500 Mbps 24-month contract at around £32/mo for the first 6 months stepping to £42/mo with £3/mo March rise applied: first 6 months at £32 = £192; months 7-12 at £42 = £252; March rise applied from month 7 onwards and additional March rise from month 19, approximate total over 24 months including the £3/mo rise is around £1,044 (subject to exact promo dates and March-rise timing). By contrast, toob at around £24/mo fixed on 18-month contract = £432 total; BeFibre Be500 at around £27/mo fixed on 24-month = approximately £648 total. Over equivalent terms, 4th Utility is materially more expensive than fixed-price altnet rivals on the same speed tier. Where 4th Utility wins is convenience (already wired in your apartment), contract flexibility (30-day rolling available), and the block-wide social tariff option.
Why 4th Utility fits apartments and new-builds
4th Utility's developer-partnership model has specific advantages for apartment residents and new-build home buyers that are worth understanding in detail.
Apartment resident advantages
- Fibre already wired in: if your building is a 4th Utility partner, the fibre is typically already in place and no engineer visit is needed for activation.
- No wayleave issues: unlike street-by-street altnets, 4th Utility works with building managers to handle wayleave and common-area access at the property level. Residents do not need to negotiate building consent individually.
- Block-wide social tariff: in some apartment arrangements, social tariff eligibility extends to all residents within the block without individual documentation, which is unusual and potentially generous for households on qualifying benefits.
- Standardised installation: for buildings wired at construction, every resident gets the same network quality and the same apartment-friendly installation approach.
New-build home-buyer advantages
- Active from move-in: for new-build developments wired at construction, broadband can be active from the day you move in rather than requiring a separate install.
- Future-proof connection: purpose-built fibre with gigabit-capable infrastructure in place from day one, avoiding the retrofit friction many older homes face with Openreach FTTP rollout.
- Developer commitments: many new-build developer partnerships include multi-year agreements that give 4th Utility an ongoing presence in the development.
- Predictable quality: because the network is purpose-built rather than retrofitted, performance tends to be consistent across units.
The editorial honest take. 4th Utility's apartment-block specialism is a genuine product differentiator for the right household context. If you have recently moved into a modern apartment block or new-build development and the building manager confirms 4th Utility is already wired in, the convenience advantage is real and worth factoring into your decision. If your building does not have 4th Utility installed, the alternative is to rely on Openreach FTTP (if available), or look at Hyperoptic for apartment-specific options in cities where Hyperoptic has deployed. 4th Utility does not retrofit individual apartments outside its developer-partnered buildings, so your address is either wired or not.
4th Utility vs Toob, Hyperoptic, and Community Fibre
For addresses where 4th Utility is available, the comparisons worth running are (1) against Hyperoptic in overlap buildings (rare but possible in purpose-built apartment blocks), (2) against Community Fibre in London, (3) against toob in CityFibre-served cities, and (4) against Openreach-based majors in buildings where both are available.
Where 4th Utility wins
- Already wired into many apartment blocks and new-builds: no install friction.
- Flexible contract lengths including 6-month, 12-month, 24-month, and 30-day rolling (unusual).
- Block-wide social tariff arrangements in some apartment buildings.
- Symmetric speeds across every tier vs asymmetric on Openreach FTTP.
- Unlimited data with no fair-use throttling.
- Free installation on 12-month and 24-month contracts.
- Multi-gig 2.3 Gbps tier available in CityFibre multi-gigabit areas.
Where others win
- Toob (#toobpromise): absolute fixed price for contract (£0 rises vs 4th Utility's £3/mo March rise) and Linksys Wi-Fi 6 mesh router.
- Hyperoptic: larger apartment-focused footprint in many cities; Wi-Fi 6 router on many packages; 30-day rolling on every tier.
- Community Fibre (London only): typically faster top speeds and better London pricing.
- Zen: Which? 84% customer satisfaction, PC Pro 22-year award streak, B Corp certified, absolute Contract Price Promise.
- BeFibre (FullFibre-Zzoomm): Wi-Fi 7 router on Be900/Be2300, fixed-price promise, 16+ English counties.
- YouFibre (on Netomnia): multi-gig up to 7 Gbps, fixed-price for contract term.
- Openreach majors (BT, Sky, BT): TV bundles, mobile bundle discounts, nationwide availability.
The practical arithmetic worth stating out loud. On 500 Mbps over 24 months at a 4th Utility apartment address: 4th Utility promo of £32/mo for 6 months stepping to £42/mo with £3/mo March rises applied works out to approximately £1,044 total over 24 months (approximate; exact timing of March rises varies). Toob Home500 at £24/mo fixed on 18-month contract works out to £432 total (adjust to 24 months by re-contracting mid-flow). BeFibre Be500 at around £27/mo fixed on 24-month contract works out to approximately £648 total. Zen Full Fibre 500 on Openreach at around £42/mo fixed for 18 months = £756 total. 4th Utility is materially more expensive than fixed-price rivals at the same speed, but the convenience advantage for apartment residents (fibre already wired, no install hassle) is genuine value that may offset the price premium depending on context.
What to check before ordering 4th Utility
Confirm your building has 4th Utility
For apartment residents, ask your building manager whether 4th Utility is already installed. Run the postcode check at the4thutility.co.uk or BroadbandSwitch comparison tool with your full address. For new-build home buyers, ask the developer which broadband provider is installed at construction.
Factor the £3/mo March rise into your total cost
4th Utility's fixed-term contracts apply a £3 per month rise every March during the minimum term. Calculate your 12-month or 24-month total cost including the rise before comparing against fixed-price altnets like toob, Zen, BeFibre, or YouFibre.
Pick the right contract length
24-month contracts typically offer best headline pricing. 12-month gives moderate flexibility. 6-month is unusual and useful for short-term arrangements. 30-day rolling costs more per month and may include a small activation fee, but offers genuine month-to-month flexibility (rare in UK broadband).
Check social tariff eligibility
If your household receives Universal Credit, Jobseekers Allowance, Income Support, or Pension Credit, the social tariff may apply. Ask whether the 4th Utility apartment arrangement at your building extends social tariff block-wide without individual documentation; this is unusually generous when available.
Plan for the Wi-Fi 5 router
The included Icotera i4850-25 is a Wi-Fi 5 dual-band router. It handles gigabit-class speeds well over wired Ethernet but is not current-generation wireless. For power users, request a separate bridge device plus PPPoE credentials and use your own Wi-Fi 6 or Wi-Fi 7 router. For typical household use it is adequate.
Set a reminder for contract end
Post-contract pricing steps up. Set a calendar reminder for month 22 on a 24-month contract to renegotiate or switch. 4th Utility may offer retention pricing if you ask; do not let the contract auto-renew at the higher out-of-contract rate by default.
Compare 4th Utility deals by postcode
The comparison widget below is filtered to show 4th Utility home broadband only. Enter your postcode and select your exact address to see plans available at your property, ranked by recommendation. For apartment residents, also confirm with your building manager whether 4th Utility is installed.
Prefer to see the full UK market? Compare all providers at your postcode or filter by feature. For similar apartment-friendly altnets, see Hyperoptic (nationwide) or Community Fibre (London). For fixed-price altnets, see Toob, Zen, BeFibre, or YouFibre.
Related routes
Trust, reputation, and corporate context
The 4th Utility Limited is an alternative-network full-fibre operator specialising in apartment blocks, new-build developments, and purpose-built urban schemes through direct developer and building-manager partnerships. The company's brand positions broadband as the fourth essential utility alongside gas, electricity, and water: a service that should be wired into modern buildings as standard infrastructure. 4th Utility uses CityFibre's wholesale network (approximately 4.7 million UK premises) to extend coverage beyond its own building footprint into additional urban areas including London, Birmingham, and Manchester. The company is one of several retail ISPs on CityFibre alongside Vodafone, TalkTalk, Zen, Toob, and Cuckoo.
Independent review scores on Trustpilot in 2025-2026 show 4th Utility at around 4.3/5 (6,000+ reviews), suggesting generally positive customer sentiment. The primary consistent criticism is the Wi-Fi 5 router hardware being behind what some competitors ship, and the £3/mo March rise during contract being less attractive than the fixed-price commitments at toob, Zen, BeFibre, and YouFibre. Customer support is UK-based with email, phone, and online portal routes; the social tariff arrangements including block-wide eligibility in some apartment buildings are a particular strength for households on qualifying benefits.
4th Utility FAQs
Is 4th Utility broadband any good in 2026?
Yes, particularly for apartment residents and new-build home buyers whose building is wired for 4th Utility. The company offers symmetric full fibre from 100 Mbps to 2.3 Gbps on its own network and via CityFibre wholesale (approximately 4.7 million UK premises reached). Flexible contract options include 6-month, 12-month, 24-month, and 30-day rolling. Unlimited data, free installation on 12-month and 24-month contracts, and a social tariff that in some apartment arrangements extends block-wide. The honest editorial point: 4th Utility applies a £3 per month annual March price rise during the contract term, disclosed upfront per Ofcom's 17 January 2025 rule. Fixed-price rivals like Toob, Zen, BeFibre, and YouFibre commit to zero mid-contract rises. Trustpilot rating is 4.3/5 across 6,000+ reviews.
Where is 4th Utility available?
4th Utility operates in two ways. First, it builds its own network directly into specific apartment blocks, new-build developments, and purpose-built urban schemes through developer and building-manager partnerships. Second, it retails over CityFibre's wholesale network (approximately 4.7 million UK premises), extending coverage to urban areas including London, Birmingham, Manchester, and other CityFibre-served cities. Because the own-network build is building-by-building rather than street-by-street, availability can differ dramatically between adjacent properties. Always run the postcode check plus ask your building manager (if apartment) whether 4th Utility is installed.
Does 4th Utility really have a £3 per month annual price rise?
Yes, on fixed-term contracts. 4th Utility's published terms apply a £3 per month increase every March during the minimum contract term, disclosed upfront in pounds and pence consistent with Ofcom's 17 January 2025 rule change. Some variable-price deals sold via third-party comparison sites handle rises differently, often with penalty-free exit if an un-specified increase is applied. The rise is smaller than BT Group's £4 per month or Vodafone's £3.50 per month but it is a real mid-contract increase. If you want absolute fixed pricing with zero mid-contract rises, look at Toob, Zen, BeFibre, or YouFibre instead.
What router does 4th Utility provide?
The included router is the Icotera i4850-25, a Wi-Fi 5 dual-band device with four gigabit Ethernet ports. It handles gigabit-class speeds well over wired Ethernet connections but is a basic Wi-Fi router compared to the Linksys Wi-Fi 6 mesh at toob, the Wi-Fi 7 routers at BeFibre Be900/Be2300, or the eero Pro 6E at Cuckoo. Power users can request a separate bridge device plus PPPoE credentials and connect their own router of choice; ask at order. For typical household use the supplied router is adequate, particularly where most devices connect over Ethernet rather than wireless.
Why should I choose 4th Utility if it has a £3/mo rise when Toob does not?
The honest answer is convenience for apartment residents and new-build home buyers. If your building is already wired for 4th Utility, ordering broadband is friction-free: no engineer visit, no street-level build delays, no wayleave negotiation. The £3/mo March rise is a real cost that Toob, Zen, BeFibre, and YouFibre do not charge, but the convenience advantage of pre-wired apartment broadband may outweigh it depending on how much you value set-up simplicity versus total contract cost. Running the numbers on your specific speed tier and contract length is the right test. If you want both convenience and absolute fixed pricing, check whether Hyperoptic is available at your building.
Does 4th Utility offer a social tariff?
Yes. 4th Utility offers a social tariff for households receiving qualifying government benefits such as Universal Credit, Jobseekers Allowance, Income Support, or Pension Credit. Documentation is typically straightforward, and eligibility checks may still apply. Importantly, in some apartment block arrangements 4th Utility has extended social tariff eligibility to all residents within the designated block without requiring individual documentation, which is unusually generous. Ask at your building whether this arrangement applies. Compared to BT Home Essentials, Virgin Media Essential Broadband, or Vodafone Essentials, 4th Utility's social tariff runs on genuine full fibre.
Can I get a short-term or rolling contract with 4th Utility?
Yes. 4th Utility offers a 30-day rolling contract alongside 6-month, 12-month, and 24-month minimum-term options. The 30-day rolling option costs more per month than the minimum-term alternatives and may include a small activation fee, but it provides genuine month-to-month flexibility. This is relatively rare among UK altnets (only Hyperoptic and Cuckoo offer similar flexibility on more tiers). If you are renting short-term, planning to move soon, or uncertain about commitment, the rolling option is worth considering. Note the rolling option does not have the £3/mo March rise because there is no minimum term.
How does 4th Utility's switching process work?
Because 4th Utility runs on its own network or on CityFibre wholesale (both independent of Openreach), switching does not use the Openreach wholesale transfer process. For regulated products including home broadband, One Touch Switch (launched 12 September 2024) applies: your new 4th Utility service coordinates the switch automatically with your old provider, and you do not need to contact them separately. For apartment residents whose building is pre-wired for 4th Utility, activation is typically within days of order and does not require an engineer visit. For new-build developments, broadband can often be active from move-in day.
References
1. Ofcom on in-contract price rises
Ofcom (2025). Ban on inflation-linked mid-contract price rises.
3. 4th Utility (official information)
Confirm current packages, the £3/mo March rise line, and contract options on the provider’s own site.
Editorial accountability. This page was written by Adrian James and reviewed by Dr Alex J. Martin-Smith. We do not accept payment for editorial placement. Our affiliate disclosure and editorial policy explain how we earn and how corrections work. Typical pricing ranges shown on this page reflect April 2026 market observation. The £3 per month annual March price rise is taken directly from 4th Utility's contract terms; confirm live pricing and current terms at the4thutility.co.uk before ordering. This page deliberately contrasts the 4th Utility £3/mo March rise with the zero-rise commitments at Toob, Zen, BeFibre, and YouFibre so readers understand the choice accurately.
See 4th Utility ranked against every provider at your address
For apartment residents and new-build home buyers whose building is already wired, 4th Utility offers material convenience. For household budgets priority, fixed-price altnets like Toob may save money over the contract. Run the live check and compare total contract cost.
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