I had a house where a shaded corner had a shrub in front of it (nasty, spiky bloody thing!) which prevented any airflow and turned the wall green, so it could just be that but obviously worth making sure
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local