According to the Energy Saving Trust, insulating underneath the floorboards on the ground floor (only rooms above unheated spaces need to be insulated) can save you around £60 annually.
Some suspended floors can be accessed from underneath (if there’s a cellar, for example), but if this isn’t possible, you could take up the floorboards to fit insulation. The downside of this is that it’s a big, disruptive job and you may break some of the boards in the process, or not be able to get them all up. You can also fill the gaps between the boards, which seems the obvious way to stop the draughts. However, walking on the floor is likely to dislodge at least some of the filler, so it could be a waste of time in the long run.
Another big job is making your home’s windows less draughty and more energy efficient, especially if you live in a period property that has the original windows. Replacing windows is expensive, typically costing several thousand pounds for a house, but it is worth doing if you can afford to.
Remember that double-glazed windows don’t have to be made of UPVC - there’s more choice of styles and materials than you might think, unless you live in a listed building or on ‘designated land’, such as conservation areas, where there are stricter rules about replacement windows (and doors).
If you can’t afford to change the windows, or at least the glazing (sometimes you can replace single glazing with double glazing, or fit special heat-retaining glass to the existing windows), there are much cheaper ways to make windows more energy efficient. These include fitting secondary glazing units or film (clear film you fix in place across the windows with tape).
Another good DIY option is weatherstripping, which is draught-proofing tape that helps to fill the gap between the frame and the window’s moving parts.
Original sash windows are notoriously draughty, and weatherstripping can make them less so, but consult a good DIY book or website to see how to apply it to sashes, or get a pro to do it, because it’s more complicated than with other types of window.
In a similar way, brush draught excluders around exterior doorframes can be effective at keeping the cold out, as can a brush strip fixed to the bottom of the door - just cut it to fit and screw it in place.
A ‘sausage’ fabric draught excluder will also help to reduce draughts, as a brush strip will only cover some of the gap - fit it too low, and it will drag on the floor. And don’t forget to fit keyhole and letterbox covers to stop cold air coming in there.
For extra insulation at this time of year, it’s a good idea to fit a curtain pole above the door and hang a heavy curtain across it, especially if the door is partially or fully glazed. Measures like these should make your home cosier and help to reduce your heating bills, which is always welcome.
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To make original floorboards less draughty, try using Polycell Flexible Gap Polyfilla (£3.98, B&Q) to fill any gaps between them and the skirting boards.
This filler is designed for gaps along skirting boards, window frames and doorframes because it flexes with movement.
It can be painted over when fully dry and is surface dry in about an hour. Best of all, it’s less rubbery than most flexible fillers and so easier to work with and it can even be used outdoors, which is really useful.
If you have a fireplace that isn’t in use and is open to the chimney above, it can be very draughty, but it doesn’t have to be.
A chimney balloon is the best way to plug the gap, but if you don’t want to buy a balloon, you could try making a DIY version with a bin bag containing loft insulation or an old pillow. Whatever you use, make sure you remove it before using the fireplace.