Internet for a Granny Flat: Separate Service or Shared Wi-Fi?

Internet for a granny flat can be straightforward once you separate two questions: can the dwelling order its own service, and how will a reliable signal reach the people using it? Buying a stronger router only addresses the second question. It does not create an address record or an independent account.

Quick answer

Internet for a granny flat starts with the address, not the router. Ask a provider whether the flat can have an independent NBN service. If it cannot, compare an agreed connection from the main house with mobile or home wireless options. Check installation, coverage, privacy, account ownership and landlord permission before committing.

Internet for a granny flat: check the address first

NBN’s granny-flat guidance explains that an outbuilding at the same address will not usually qualify automatically for a new connection. A separate mailbox, kitchen or tenancy is not proof of a separate NBN serviceable location. Ask a retail provider to investigate the actual address record.

Give the provider the full address, unit designation and details of existing equipment. If the flat is missing from the system, ask what documentation is needed and who lodges the request. NBN may need to work with the provider on address information; a standard online availability result is not always the end of the enquiry.

Where a property has been formally subdivided or newly developed, a different connection process may apply. Our new-development connection guide explains the distinction. Confirm any charges for your property rather than applying a fee mentioned for a different type of build.

Compare three practical arrangements

An independent account can make responsibility clearer for unrelated households. Sharing can avoid another monthly service, but it also creates dependence on the main account holder. Wireless access avoids extending the house connection, yet reception at the front of the property may differ from reception inside the flat.

If you share, test the link rather than guessing

Stand in the rooms where the connection will be used and test a video call, an upload and ordinary browsing. Repeat during the household’s busy period. A speed test beside the main router does not describe the connection behind two external walls in the backyard.

A mesh system, correctly designed access-point arrangement or professionally installed link may help. They solve different problems. See our mesh Wi-Fi versus extender guide before choosing hardware simply because it advertises a large coverage area.

Do not assume a faster NBN plan will fix poor radio coverage. If the main house already receives adequate internet but the flat has a weak local connection, address that link first. Our explanation of Wi-Fi speed versus internet speed helps separate the two tests.

Fixed cabling needs the right professional

ACMA’s cabling guidance explains the role of registered cablers in home telecommunications work. Ask an appropriately registered cabler to assess any fixed cable route between buildings. Do not run improvised cables through a yard or undertake fixed wiring because an online tutorial makes it look simple.

Request an itemised quote covering the route, equipment, termination, testing and any property restoration. Ask which approvals you must obtain and whether the proposed equipment is suitable for its environment. Electrical work, trenching and telecommunications work may involve different responsibilities.

The cheapest hardware price is not the installed price. A quote that includes reliable delivery to the flat, a usable indoor access point and testing is easier to compare than a bare cable price with the difficult work left unspecified.

Separate the networks as well as the bills

Sharing internet should not mean giving another household access to your personal devices. Ask the installer about a separate network with suitable isolation. Use distinct credentials and decide who can administer the equipment. Do not assume a network called “guest” provides every separation feature you need.

Agree how updates, faults and password changes will be handled. If the main account holder goes away, the other household still needs a way to report a problem. Avoid sharing the provider-account password as a shortcut; use an authorised contact arrangement if the provider offers one.

These are practical privacy measures, not a guarantee of complete security. People handling sensitive work information should also follow their employer’s requirements. A home-network arrangement that suits streaming may not meet a workplace’s access rules.

Make the monthly arrangement explicit

Write down who pays the bill, how any contribution is calculated and what happens after a price change. Also decide who owns the equipment and whether it stays when a tenant or family member leaves. Check the provider’s terms before sharing access beyond the account holder’s household.

Consider the effect of overdue bills or cancellation. If one account supplies both dwellings, a service interruption can affect both even when only one household has missed its contribution. Separate accounts may be preferable where control and independence matter more than the apparent monthly saving.

Ask a relevant tenancy adviser about legal responsibilities if there is uncertainty. This guide does not determine whether a landlord may charge a particular amount or require a particular provider.

Price the first year, not just the plan

Build a comparison using twelve months of service charges plus equipment, installation and any connection fees. For a shared arrangement, count the incremental cost, such as better networking equipment or a plan change, rather than treating the existing connection as automatically free.

For illustration, a $600 installation spread across a two-year stay represents $25 a month before service charges. A shorter six-month stay makes the same installation equivalent to $100 a month. These are arithmetic examples, not quotes or predicted savings.

Include cancellation and equipment-return conditions for a wireless alternative. If reception is uncertain, ask about the provider’s testing or return arrangements before paying. Retain the terms that apply when you order.

A useful order of decisions

Start with address eligibility, then decide whether independence or sharing suits the occupants. Obtain permission and an installation assessment, test wireless reception where relevant, and finally compare the ongoing service. This sequence prevents a cheap plan from dictating an expensive or unsuitable setup.

When you are ready to compare internet options, use the actual service address and the arrangement confirmed by the provider. Check again if the flat gains a separate address or the property configuration changes.

Research checked 29 September 2026. Availability, installation requirements and provider terms remain address-specific.