I have put an offer in on a house that is virtually the same, going to see what recommendations you receive . hope to be moving next month. my initial idea is to take the wall out. I keep looking on houzz for inspiration.

Photos:

I think you need to weigh up several things. What you can reasonably expect to achieve in your current home with an extension, and how much would it cost to get the same space if you move, including stamp duty, moving costs and decor / improvements. Are the houses genuinely comparable? (When we were making the same decision a lot of the 5 bed homes in our area were 3 bed footprint with a loft conversion including 2 bedrooms. The downstairs were offering less space than we already had and the cost was at least an extra £100k over the cost to improve our existing home.) As you have kids, you may need to think about schooling and whether it is an advantage to stay where you are or better to move for more chance to get into a desirable school.

Thanks to everyone who replied Just an update So over the weekend, went up to the attic, armed with several tools. One was a pocket temp and humidity gauge, which showed an initial reading of 2 C and a humidity of 90% I also bought an industrial strength dehumidifier, Powerdri 18 L, and popped it up on Saturday morning. It claimed to suck up to 18 L of water per day. Came back in the afternoon, just had around 100 mls in the water tank, a damp squib. Humidity still remained at around 75 and temp the same. So got my portable heater, the standard one you use in the room and left it on for a couple of hours. Returned and hey presto, the humidity was now down to 60, temp went up to 14C and the droplets/condensation on the felt seemed to have evaporated ..great success (Borat) In the meanwhile, I pulled all the insulation back, the ones which I feel had blocked the eaves Not 100% sure they were blocked but yes possibly. There were other areas in the loft, where the insulation had definitely not caused any blockages. Sunday was much better. Switched off the humidifier and the heating and re-checked the temp. It was around 5 C and the humidity around 85%, which was the same as outside. So I presume airflow is present, from interior to exterior, if both have the same humidity? This is all from my end. Will repeat the same over the next weekend. In the meanwhile, I hope my felt lap vents will finally arrive and may make a difference. Or as Jonathan said, could be just related to the cold snap and me vigorously pushing the insulation into the eaves. Fingers crossed but the dampness is not to be taken lightly, seen mould grow like wildfire , if this is ignored KR Mel pics? pre and post-insulation being moved