The costs we suggest for installing solid wall insulation are for paying a company to come in, insulate your whole house in one go, fully redecorate and replace everything just as it was. Some people want exactly this, but it does cost a lot of money.
If you’re looking to spend less, it is advisable to insulate a wall when you are having other building or decorating work done.
Internal insulation can be fitted when you’re planning to redecorate anyway, or to fit a new kitchen or bathroom. You can also spread the cost by tackling one room at a time.
External insulation will also cost less if you fit it when you’re having other work done to the outside. If you’re having a new roof, or painting the windows, or even having solar PV panels fitted, then you will probably have scaffolding up already, which can save a bit on the costs. If your walls need repointing or other repair work, it’s worth getting a quote for a complete refurbishment including insulation – it will probably work out cheaper than doing the two things separately.
Sometimes there is financial support available to help with the cost of solid wall insulation.
You can contact your local authority to see if there is any help in your area, or find out more about financial support.