What the Walls Can Tell You: Seven Due-Diligence Checks for Connected Living
In the UK housing market, the phrase smart home often appears in listing copy as a mood rather than a specification. A video doorbell and a voice assistant may look impressive on a viewing, but they say little about whether a property can support connected heating, security, broadband and electric vehicle charging over the next decade. As of November 2026, buyers are increasingly being asked to pay a premium for connectivity. The useful question is not whether a home has gadgets, but whether its fabric, services and legal arrangements can accommodate them without a costly retrofit.
1. Start with the broadband record, not the router
Ask what technology actually serves the property. Full-fibre connections, cable networks and older copper services are not interchangeable, and a seller’s current broadband package is only part of the picture. Check the Ofcom broadband checker and the availability maps published by Openreach and alternative network providers. In flats, ask where the communal equipment sits, who is responsible for it and whether a wayleave or landlord consent is needed for new cabling.
Inside the home, look for the optical network terminal and the route taken by internal cables. A router placed in a hallway cupboard may be tidy, but it can also create Wi-Fi dead spots in rear rooms. Mobile coverage matters too: a connected home is a network-dependent home, and poor indoor signal can undermine security devices, heating controls and remote working. Ask for recent speed-test evidence rather than relying on an agent’s assurance.
2. Inspect the consumer unit and spare capacity
The consumer unit is one of the most revealing pieces of infrastructure in any home. A modern board with spare ways, residual current devices and clear labelling is more valuable to a connected household than a collection of app-controlled sockets. Electric vehicle chargers, heat pumps, batteries and additional circuits all place demands on the electrical installation. Buyers should ask for the electrical installation certificate and a recent electrical installation condition report, often called an EICR.
Single-phase supply may be adequate for many homes, but larger properties or those planning major electrification should establish whether a three-phase connection is present or feasible. Earthing and bonding arrangements should be checked by a qualified electrician. A smart-home premium should reflect capacity and evidence, not simply the presence of a branded thermostat.
3. Test heating compatibility, not just thermostat branding
Smart heating controls are among the easiest devices to change, which is precisely why they should not carry much weight in a purchase decision. More important is the underlying heating system: boiler age, service history, zoning, radiator sizes, pipework and the location of hot-water cylinders. Buyers considering a future heat pump should look at insulation, emitter capacity and the space available for a cylinder and plant.
Ask how the current controls are wired and whether the system supports room-by-room zoning. Underfloor heating can be compatible with connected controls, but only if the manifolds and actuators are in good order. A vendor may leave behind a smart thermostat; the buyer may inherit a heating system that cannot use it well.
4. Check metering and energy data
A smart meter is not, by itself, a mark of a smart home. What matters is whether the meter communicates reliably, where it is located and whether the property has solar panels, a battery or an export meter. Buyers should ask about the communications hub and whether the meter has been functioning with the national data network. If the property is off the gas grid, metering and tariff arrangements deserve particular attention.
Energy data can support better decisions, but only where the infrastructure is accessible and documented. A meter tucked behind a locked cupboard or dependent on a weak signal may limit the value of connected tariffs and monitoring systems.
5. Examine parking and EV charging realities
Electric vehicle charging is one of the clearest tests of retrofit readiness. Off-street parking is the starting point, but buyers should also consider the cable route from the consumer unit, the capacity of the supply and whether the local distribution network operator needs notification. Load management may be necessary where the existing supply is constrained.
Leaseholders and owners of flats should check who owns the parking space and what consent is required for a chargepoint, cable routing or communal equipment. Listed buildings and conservation areas may impose further constraints. An existing chargepoint should be inspected for safety, warranties and transferability; it should not be assumed to add value simply because it is fixed to the wall.
6. Read the lease, title and planning constraints
Legal arrangements can outweigh hardware. Leaseholders should examine alterations clauses, permissions for external equipment, wayleaves, estate charges and restrictions on cabling or satellite dishes. Freeholders should check title plans and any covenants that affect parking, shared services or external works. In blocks, the freeholder or managing agent may control access to risers, roofs and communal electricity supplies.
Planning constraints also matter. Heat pumps, EV chargers and external security equipment may benefit from permitted development rights in some circumstances, but listed buildings, conservation areas and Article 4 directions can change the picture. Buyers should take appropriate professional advice before assuming that a desired upgrade will be straightforward.
7. Assess the network backbone and security wiring
Connectivity inside the home depends on more than the broadband line. Look for data cabling, a patch panel, power over Ethernet and a sensible distribution point. Alarm wiring, CCTV and doorbell positions should be examined for power and network access. Proprietary systems can become expensive to maintain if the original installer disappears or the app is discontinued.
A well-planned network cupboard, adequate power in useful locations and clear documentation are quiet indicators of genuine smart-home readiness. They are less photogenic than a wall-mounted tablet, but they are more likely to support future devices and services.
Distinguishing value from marketing
A smart-home premium should be justified by demonstrable infrastructure and paperwork: a recent EICR, broadband records, heating service history, permissions, warranties and clear information about shared services. Gadgets depreciate quickly; fibre, electrical capacity and legal permissions endure. Where evidence is missing, buyers should negotiate rather than assume. A specialist survey or electrician’s report can be a sensible cost before exchange, particularly where the property is being marketed on its connected credentials. The most reliable smart home is not the one with the most apps, but the one that can absorb change without opening every wall.
