What should I know before installing an electric fire in a chimney?

Question

This is something we've discussed over the holidays, but we're a bit lost at what would be involved and the cost we're looking at excluding the cost of the electric fire and installation of it? Can an expert break this down for us with costs to expect?

Teodor · Answer

Installing an electric fire in a chimney breast is usually straightforward compared to gas, but there are a few things to consider.
1. Chimney condition
If the chimney is no longer in use, it should be capped externally and ventilated to prevent damp. You don’t need a flue liner for an electric fire, but the chimney void is often boarded and insulated to reduce drafts.
2. Power supply
You’ll need a nearby socket or a new fused spur installed. If there isn’t one in the chimney breast, an electrician may need to run a new supply. Budget around £100–£250 depending on access and distance.
3. Opening preparation
The fireplace opening may need reducing, plastering, boarding or fitting a new lintel/surround depending on the style of fire (inset, wall-mounted or freestanding). Allow £200–£600+ for building and finishing work if required.
4. Installation cost (labour only)
For a simple install with existing power and suitable opening: £150–£300.
If electrical work and making good is needed: total costs can be £400–£900+ excluding the fire itself.
Overall cost really depends on whether it’s a straight swap into an existing fireplace or you’re modifying the chimney breast. If you can confirm the type of fire and whether there’s an existing power supply in place, the estimate can be narrowed down further

Keith · Answer

It all depends on what sort of chimney you have, if it's open, you will need to board over the opening, don't forget to install a vent as the chimney needs to breathe, if there is no chimney cowl, you need to have one to stop the rain coming in, but it still allows the as or flow, this helps stop the damp.

Wesley · Answer

I think keith has answered the question perfectly.as for the electric side of things it shouldn't be to big a job if the existing installation is to standard..Extending existing or installing new circuits have to be to the current regulations.If you have an existing EICR for the installation this would hi light any issues.

Martin · Answer

I think the answers already pretty much cover it all I would add would be whether you have it hardwired on its own circuit if possible

Daniel · Answer

Chimney condition: Even though an electric fire doesn’t use the chimney, the flue should be clean, dry, and free from damp or debris. An unused chimney may need ventilation to prevent condensation and mould.

Power supply: Electric fires need a nearby socket or fused spur. Make sure the electrical supply is adequate and safely installed, ideally by a qualified electrician.

Fire size and fit: Measure the fireplace opening carefully. Some electric fires are inset models designed to fit inside an existing chimney recess, while others are freestanding or wall-mounted.

Ventilation needs: Electric fires don’t require a flue, but older fireplaces may still need an air vent to keep the chimney dry and prevent damp problems.

Heat output: Most electric fires provide 1–2 kW of heat, which is enough for supplemental heating but not usually for heating an entire room on its own.

Safety clearances: Check manufacturer guidelines for distances from combustible materials such as wooden surrounds or mantels.

Building regulations: In the UK, electric fires generally do not require Building Control approval, but any electrical work must comply with Part P of the Building Regulations.

Aesthetic considerations: You may want a chimney closure plate or fireback to improve appearance and reduce draughts from the chimney.

Overall, electric fires are one of the easiest and safest options for using an old chimney, but proper preparation helps avoid damp, electrical, and fitting issues.

Steven · Answer

An electric fire is one of the simplest and safest options for a chimney, but there are a few key points to consider before you commit:

1. Power supply – Most electric fires need a dedicated socket inside or near the chimney breast. If one isn’t already there, an electrician will need to install it (often chasing a cable in the wall).

2. Opening size & surround – The chimney opening must suit the fire you choose. You may need a trim, back panel, or minor building work to achieve a neat finish.

3. Ventilation & condition – Even though it’s electric, the chimney should be checked for damp, debris, or drafts. Some installs include sealing or lining the opening to prevent heat loss.

4. Heat output – Most electric fires provide 1–2 kW of heat, so they’re ideal for rooms rather than whole-house heating.

Typical costs excluding the fire itself:

Electrical supply (if required): £80–£150

Basic fitting into an existing opening: £100–£200

Minor building/finishing work (if needed): £100–£300

In most homes, the total installation cost lands between £150 and £400, depending on what’s already in place. A site visit allows an installer to confirm exactly what’s required and give a fixed price.

What should I know before installing an electric fire in a chimney?

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