Check the Internet Before You Buy: Fibre, 5G and Starlink Due Diligence for Overseas Property

Published on: July 14, 2026

Last verified: 14 July 2026. Broadband, mobile and satellite availability, and the legality of satellite services, vary by country and change frequently. Verify at the exact address before acting.

Buyers will spend three site visits testing water pressure, checking for damp, and haggling over the kitchen, and then discover, after they have moved in, that the "fast fibre" the agent promised is a single overloaded copper line and the mobile signal drops in the bedroom. In the remote-work era, connectivity isn't a utility footnote. For a large share of international buyers, it is the difference between a home they can actually live and work in and an expensive holiday house.

Here is the problem: internet quality is almost never disclosed accurately, it varies enormously street by street (especially rurally), and unlike a leaking roof, you can't see it. This guide turns connectivity into something you verify on the ground before you commit, the same way you would check the title.

Key takeaway: Never trust a coverage map or a seller's word alone. Verify connectivity at the exact address, on more than one option, during your viewing: run a real speed test on the property's own line, test mobile signal indoors on the main carriers, confirm what wired service can actually be installed, and, if you might rely on satellite, check that Starlink is available and legal at that location. Rural "up to" speeds and reality are frequently not the same number.

Why connectivity has to be part of your due diligence

Three things make internet a genuine buy-or-walk factor rather than a detail:

• It is binary for remote workers. A video call either holds or it doesn't. If your income depends on stable uploads and low latency, marginal connectivity isn't a compromise, it's a non-starter.
• It is expensive or impossible to fix retroactively. Getting fibre trenched to a rural property can cost thousands and take months, if the provider will do it at all. You cannot assume you will sort it out later.
• It is rarely disclosed honestly. "Superfast broadband available" often means available in the wider area or to a cabinet down the road, not to your door at usable speed. Advertised "up to" figures describe a best case that rural and older properties seldom reach.

The four layers worth checking are: fixed-line (fibre, cable, or DSL/copper), mobile (4G/5G), satellite (Starlink and alternatives), and redundancy (do you have a viable backup when one fails).

Layer 1: Fixed-line broadband, what is really at the door

The single most important distinction is what physically reaches the property, not the neighbourhood.

Fibre-to-the-home (FTTH/FTTP) is the gold standard: fibre runs all the way into the building. Fibre-to-the-cabinet (FTTC) runs fibre to a street cabinet and then copper the rest of the way, so speeds fall off sharply with distance from the cabinet, and a home 800 metres away can be far slower than one next to it. DSL/copper and older cable vary widely in quality. In many rural and coastal areas, the honest answer is "copper only," and that shapes everything.

How to verify:

• Ask for the exact address-level availability, not the postcode or town. Most countries have a national broadband checker (often run by the telecom regulator or incumbent operator) where you enter the full address.
• If the property is currently occupied, ask the seller to run a live speed test on their own connection while you watch, ideally on a wired connection, and note the actual download and upload speeds and the ping.
• Confirm what can be newly installed, at what cost, and with what lead time. "Available" sometimes means "available if you pay for a new line to be run."
• Look for more than one wired provider. A single monopoly line with no alternative is a risk if service is poor.

Layer 2: Mobile, test 4G/5G indoors on every carrier

Mobile is your everyday backup and, in some locations, your primary connection. Coverage maps are optimistic and don't account for the walls of the specific building, hills, or the fact that thick stone and reinforced concrete kill signal.

How to verify:

• Bring a phone (or two) and test signal inside the property, in the rooms you will actually work and sleep in, not just standing outside. Run a mobile speed test in each.
• Test the major carriers, not just your own, since you will want the option to switch. A cheap local prepaid SIM for a viewing is worth it.
• Check whether 5G genuinely reaches the address or whether you will be on 4G. In many rural areas 4G is the real ceiling, and that is fine if it is stable.
• Note peak-time behaviour if you can. A signal that is great at 11am can congest in the evening.

Layer 3: Satellite (Starlink and alternatives), the rural safety net

Low-earth-orbit satellite internet has changed the maths for remote and rural properties. Starlink now operates in a very large number of countries (well over a hundred, with coverage still expanding) and can deliver genuinely usable speeds and latency good enough for video calls in places fibre will never reach. But two things must be checked at the specific location, not assumed.

Availability and legality vary by country and can change. Some countries have full residential service; some have only maritime or aviation or roaming service; some are in regulatory limbo; and a handful ban it outright. Importing or operating a satellite terminal where it isn't licensed can be illegal. Never assume Starlink "will just work", confirm it for that country.

Line of sight matters. Satellite dishes need a clear view of the sky. Trees, tall neighbouring buildings, or a valley wall can obstruct the signal.

How to verify:

• Check the official Starlink availability map for the exact address and note whether the status is full residential service, roaming-only, waitlisted, or unavailable.
• Confirm the legal status of satellite internet in that country with a local source. Regulations differ and evolve, and "available on the map" is not the same as "licensed for residential use everywhere."
• Use the Starlink app's obstruction or sky-view checker on site to confirm a clear line of sight from where a dish would be mounted.
• Factor in hardware and monthly costs, which vary by country, and remember the dish needs continuous power and shelter from extreme weather.
• Look into alternatives where relevant (other LEO or regional satellite providers, or fixed-wireless), especially in countries where Starlink isn't licensed.

Layer 4: Redundancy, never depend on a single link

If your livelihood runs through the connection, one line is a single point of failure. The best setups combine two independent technologies, for example fibre or cable as primary with a 5G router as automatic failover, or Starlink as primary with mobile backup. Ask yourself: when the main link goes down for a day, what happens to my work? If the answer is "everything stops," build in a backup before you rely on the place full-time.

The on-site connectivity checklist

Do this during a viewing, not from your desk at home.

• Run a live wired speed test on the property's existing line (download, upload, ping). Screenshot it.
• Test mobile signal indoors in each key room, on at least two carriers.
• Enter the exact address into the national broadband checker and the Starlink map.
• Confirm what fixed-line service can be installed, the cost, and the lead time, in writing.
• Verify satellite is legal and available at that location if you may rely on it.
• Check line of sight to the sky for a potential dish.
• Ask neighbours what they actually use and how it performs, the most honest data you will get.
• Plan your redundancy: identify a viable second connection before you buy.

Frequently asked questions

Is Starlink available and legal everywhere?
No. Starlink operates in a large and growing list of countries, but status differs by location: some have full residential service, some only roaming or maritime service, some are pending regulatory approval, and a few ban it. Availability and legality can also change over time. Always check the official availability map for the specific address and confirm the local legal status before relying on it.

How do I test internet speed before buying?
Run a real speed test on the property's own connection during a viewing, ideally wired, and record the download speed, upload speed and ping. Also test mobile data indoors on more than one carrier. Do not rely on advertised "up to" figures or coverage maps, which describe best cases and wider areas rather than your exact address.

The listing says "fibre available." Can I trust that?
Not without verifying. "Available" often means available in the area or to a nearby cabinet, not fibre all the way to the property at usable speed. Confirm at address level whether it is fibre-to-the-home, fibre-to-the-cabinet, or copper, and whether new installation is possible, at what cost.

What internet speed do I need to work remotely from an overseas home?
It depends on your work, but a stable connection with reliable upload speed and low latency matters more than a high headline download number. Video calls are sensitive to upload speed and ping, so test those specifically. Consistency and a backup link usually matter more than peak speed.

Can I add fibre to a rural property later?
Sometimes, but it can be slow and costly, or the provider may decline to run a line to an isolated property. Never assume you can upgrade after purchase; confirm what is installable, at what price and lead time, before you commit, and treat satellite or 5G as your realistic option if fibre isn't feasible.

Keep reading on JanusHermes

Connectivity is one line item in the broader job of setting up utilities abroad after you buy. Fold the checks above into your property viewing-trip checklist. And if you are buying to work remotely, read the digital-nomad visa and property map alongside the permanent-establishment tax trap that working from an overseas home can create.

This article is general guidance for international property buyers and reflects the connectivity landscape at the time of writing. Broadband, mobile and satellite availability, and the legality of satellite services, vary by country and location and change frequently. Always verify connectivity at the specific address and confirm current local rules before making a purchase decision.