Every construction site, development compound and managed property in the UK needs the same three things from its internet connection: it must arrive before the project starts, it must support remote access to CCTV and site systems, and it must end when the job ends — without exit fees, stranded hardware or a contract that outlives the building.

In 2026 there are three realistic ways to get broadband onto a construction site, a development plot or a vacant property: a fixed IP SIM in a 4G/5G router, a managed WiFi hire package, or a temporary fibre/FTTC line. Most comparison guides you'll find are years out of date — written before 5G went mainstream, before the PSTN switch-off deadline reshaped site security, and without a single mention of the one technical issue that decides whether your site cameras actually work: CGNAT.

This is the current, complete comparison — real speeds, real costs, real lead times — written for construction companies, property developers, estate and keyholding services, and property maintenance teams who need connectivity that moves at the speed of a programme. And if you already know a SIM is the answer, GleeSIM's full range of fixed IP SIMs is here — shipped with a 24-hour turnaround from purchase to delivery, no site survey required.

The Three Options at a Glance

The rest of this guide unpacks each row — starting with the issue the older comparisons never mention.

The CGNAT Problem: Why "Any 4G SIM" Breaks Your Site Security

Here is the single most expensive misunderstanding in temporary site connectivity, and the reason a cheap consumer data SIM is a false economy.

UK mobile networks place standard data SIMs behind carrier-grade NAT (CGNAT). Your router never receives its own public IP address — it shares one with thousands of other connections, and the address it actually holds is private and unreachable from the internet. The consequences on a live site or managed property:

• Remote CCTV viewing fails. Your security contractor, monitoring station (ARC) and head office cannot connect inbound to cameras, DVRs or NVRs. The camera records; nobody can reach it.
• Dynamic DNS (DDNS) cannot fix it. DDNS needs a public IP to point at. Behind CGNAT there isn't one. Every "free workaround" tutorial dies here — full explanation in our guide DDNS Not Working on 4G? Here's Why →
• Port forwarding does nothing. Inbound traffic is discarded at the carrier's NAT layer before it ever reaches your router's forwarding rules.
• Access control, alarms and lift lines become unreachable. With the PSTN switch-off pushing gate intercoms, door entry, alarm signalling and lift emergency lines onto 4G, an unreachable connection is a compliance and safety exposure — not just an inconvenience.

The fix is a fixed IP SIM (also called a static IP SIM): a 4G/5G data SIM assigned a permanent static public IPv4 address. No CGNAT in the path. Your site router owns a real, routable address that never changes — so remote viewing, VPN whitelisting, remote diagnostics and monitoring-station connections work exactly as they do on a fixed line.

This is the dimension the legacy "4G vs fibre" comparisons ignore entirely, and it's decisive: for any site with cameras, access control or remotely managed systems, only two of the three options natively support inbound access — and only one of them can be live tomorrow. Browse the full static IP range on the GleeSIM Fixed IP SIM collection →

Option 1: Fixed IP SIM — Site Broadband That Ships Same Day

What it is: a business-grade 4G/5G data SIM with a dedicated static public IPv4, fitted into a cellular router you own (Teltonika, Robustel, Cradlepoint, TP-Link and virtually all site routers accept GleeSIM's triple-cut 2FF/3FF/4FF SIM). One SIM powers the entire site LAN — site office broadband, welfare cabin WiFi, CCTV, time-lapse cameras, access control and alarms — via a single reachable address.

Speeds in 2026: real-world 4G delivers 30–100Mbps down depending on mast distance and congestion; 5G routinely delivers 100–300Mbps+ in covered areas — genuinely fibre-class performance for site office cloud platforms (Procore, Autodesk Build, BIM 360, Fieldwire), video calls and multi-camera CCTV streams. An external antenna on the cabin roof materially improves marginal-signal sites.

Costs: SIM-only pricing with no hire overhead. GleeSIM's range runs from £9.50/month (2GB multi-network — time-lapse cameras, trackers, alarm signalling) up to £79.99–£110/month for unlimited 5G single-network plans and £135.99–£245.99 for unlimited or 100GB multi-network options with UK, Ireland, EU and USA roaming. For most single-site deployments, the sweet spot is an unlimited single-network SIM — for example the Unlimited 5G Fixed IP SIM on EE UK from £89.99/month, which pairs EE's market-leading geographic coverage with a public IP or private APN configuration.

Lead time — and why there's no site survey: this is where the SIM model structurally outruns everything else. GleeSIM's process is fully remote: tell us the postcode of your deployment, and we check every UK network operator's masts serving that area remotely — verifying they're live and performing properly — then recommend the strongest available network for your site before your SIM is even dispatched. No assessment visit, no survey appointment, no "subject to survey" caveat in the quote. From there it's a 24-hour turnaround from purchase to delivery, and most routers are online within five minutes of the SIM arriving.

Contract: GleeSIM offers bespoke quotes on 30-day and 90-day terms with one month's cancellation notice once the initial committed tenure has elapsed. A 12-week groundworks package gets a 90-day contract; a short void-property monitoring job gets 30 days. And when the site demobilises, the SIM redeploys to the next one — static IP, firewall whitelisting and monitoring configuration intact.

Single-network vs multi-network — an honest cost note: GleeSIM also supplies multi-network fixed IP SIMs — including 3-UK-network SIMs (Vodafone, O2 and Three on a single SIM) and 4-mobile-network SIMs (all four UK operators on one SIM) — which automatically connect to the strongest available signal and switch networks if one degrades. They are the resilience gold standard for marginal-coverage plots and mission-critical monitoring. They are also more expensive than single-network plans, because multi-operator roaming agreements cost more to run. Our honest guidance: since we check the masts at your postcode remotely before dispatch, most sites do brilliantly on the single strongest network at the lower price — and we'll tell you when your location genuinely warrants the multi-network premium. Both options live side by side on the Fixed IP SIM collection page.

Best for: construction sites of every size, property developers running multiple plots, keyholding and vacant property security firms, maintenance teams managing distributed building stock, and any deployment where speed-to-live and inbound remote access are non-negotiable.

⚡ Mobilising this week? Send us your postcode — we'll check the masts, recommend the network, and have your SIM with you in 24 hours. Order a Fixed IP SIM →

Option 2: Managed WiFi Hire — Convenience at a Rental Premium

What it is: a hire company ships or installs a pre-configured 4G/5G router (sometimes with external antennas fitted at height), manages it remotely, and bills a monthly hire-plus-data fee. Established providers in this space offer portals, usage alerts, VoIP add-ons and engineer support.

Speeds: identical physics to Option 1 — it's the same 4G/5G networks underneath. The hire premium buys management, not megabits. Professionally installed external antennas do help on weak-signal sites, though a self-fitted antenna on a SIM-and-own-router setup achieves the same result for a one-off hardware cost.

Costs: typical market pricing runs ~£115–£240+ per month for router hire plus data, with variations by network count and data tier. Over a 9-month build that's £1,000–£2,000+ against a comparable SIM-only spend of £250–£900 for contractors who own a £150–£400 router — hardware that then serves every future site for free.

Lead time: usually 24–72 hours — but almost always "subject to a remote survey" or site assessment first, and genuinely same-day service is typically labelled and priced as an emergency tier. The assessment step exists because the hire company must protect its service commitment; it also means the clock doesn't start when you order.

The fixed IP catch: across the managed-hire market, a public fixed IP is commonly a paid bolt-on rather than standard — and some providers don't offer it at all. If your site has CCTV, access control or anything a monitoring station must reach, interrogate this line item before signing: a managed WiFi package without a fixed IP delivers fast browsing and unreachable cameras.

Best for: contractors who want zero involvement in hardware, large compounds needing multi-access-point WiFi coverage engineered across the site, and firms without anyone comfortable inserting a SIM and typing an APN (a five-minute job, but a real consideration for some teams).

Option 3: Temporary Fibre / FTTC — Fast Where It Exists, Slow to Arrive Everywhere

What it is: a fixed line delivered over Openreach (or altnet) infrastructure to the site — FTTC where a cabinet is nearby, FTTP where full fibre has been built out.

Speeds: FTTC delivers roughly 30–76Mbps down / up to ~20Mbps up depending on cabinet distance. FTTP, where available, is the outright speed winner: 100–900Mbps symmetrical-ish options that no cellular service consistently matches. Latency is also lower than 4G/5G — relevant for heavy VoIP estates.

Costs and lead times — the dealbreakers: a new temporary connection means an Openreach survey, potential civils where ducting is absent (common on greenfield plots — the places construction happens), installation and activation charges in the hundreds of pounds, and a standard lead time of 4–12 weeks that can stretch further. Contracts run 12–24 months as standard; early termination on a 16-week project incurs fees. And when the hoarding comes down, the line — and everything you paid to install it — stays behind.

The greenfield irony: fibre is weakest exactly where construction is strongest. New developments, brownfield regeneration and rural plots are, by definition, places where the fixed infrastructure doesn't exist yet. You are frequently the reason the fibre will eventually arrive — which is no help in week one.

Best for: long-duration projects (18 months+) on served urban sites where FTTP is already in the ground, sales suites and marketing offices that will convert to permanent use, and as the eventual permanent connection your fixed IP SIM bridges you to — then remains as failover once fibre goes live.

Head-to-Head: A 12-Week Project, Costed

Take a realistic scenario — a 12-week refurbishment with a site office, welfare cabin and four CCTV cameras requiring remote monitoring:

On programme-length work, the arithmetic isn't close. The Unlimited 5G Fixed IP SIM – EE UK covers the entire scenario above — site office, welfare WiFi and all four cameras behind one static IP — for less than the cost of the hire option's management fee alone.

Beyond the Building Site: Developers, Keyholders & Property Maintenance

The same three-way comparison applies well beyond active construction — and the fixed IP SIM case gets even stronger:

Property developers running multiple plots. Sales suites, show homes, marketing cabins and phased plots each need connectivity that starts and stops with the phase. One GleeSIM account scales across every plot, each SIM with its own dedicated static IP under a single management portal with usage alerts — and SIMs migrate from completed phases to new ones. Developers also use fixed IP SIMs to offer temporary home broadband to purchasers when fibre provision to new plots is delayed — a completion-day experience fix that protects survey scores.

Keyholding, vacant property and void security. Empty commercial units, properties between tenancies and development land are theft and squatting targets — and none of them justify a 12-month broadband contract. A fixed IP SIM in a battery- or mains-powered router puts monitored CCTV, door contacts and alarm signalling into a void property within 24 hours, reachable by the keyholding company's control room via one whitelisted static IP, on a 30-day term that ends when the tenancy starts. This is the connectivity model the vacant property security sector has been waiting for.

Property maintenance and facilities teams. Distributed building stock — housing association assets, managed blocks, retail estates — increasingly runs remote systems: boiler and plant monitoring, water temperature compliance sensors, lift emergency lines (a hard PSTN switch-off deadline item), door entry, car park ANPR. Every one of those systems needs an addressable, reachable connection. A low-data multi-network fixed IP SIM from £9.50/month per building delivers it, with the whole estate visible in one portal.

For CCTV-heavy applications across any of these sectors, our dedicated setup guide covers port forwarding, Hikvision configuration and firewall lockdown: Fixed IP SIM for CCTV UK