Thanks for all your replies. Can I just say, these are the real estate photos from when we bought, so not my clutter!
I should also clarify the reason I want to increase value now is so I can borrow more against the house for the extension.
subtitleson, the conservatory faces east. I don't have the floor plan on my laptop but I will try to dig out the hard copy and scan it.
finallyhere thank you, the conservatory is the thing that makes people say "wow" when they walk in. Our master bedrooms needs paint and my daughter's bedroom is a fantastic combo of four different walls - one yellow, one charcoal and two different wallpapers!! It is a sight to behold, believe me. So stripping and painting it white and carpeting is one of my priorities. (I've already done this with my son's tiny room).
pigpoglet & citigirl Interesting - that's exactly what my husband wants to do. The conservatory is ridiculously sunny in summer, so either tiling it or putting shade sails in is an option (though one quote for shade sails was £2500!!!). I worry about losing the wow factor.
wowfudge Unfortunately I have to get rid of the garage as it's derelict and literally falling down. I'm in two minds whether to build another garage in the extension or just make it a spare room. Do you think the loss of storage will be a big issue?
bowerbird yes, I've thought about painting the kitchen cupboards but wonder if it's worth the effort. I'd also like to replace the bold red with a white subway tile splashback.
caroin Thank you, that is the sort of straight talking advice I need! I want to borrow against the value of the house for the extension but I am unsure what the house is actually worth now. As far as I can tell the only true way to find out what the house is worth to the bank is to apply for the increased loan and keep our fingers crossed that it's not declined and looks bad on our (already slightly tenuous) credit file.
I would like to sell in the next two or three years to move back to Australia. And because Sydney is sooooo mindblowingly expensive, I need to make sure we make the most of this house so we can go back with a decent deposit. The house prices in this area are on an upward trend. In fact the house two doors from us which is not as big as ours (though has been decorated beautifully) recently sold for nearly £60K more than we paid two years ago.
Thanks again for the help! I'm going round in circles trying to make decisions!!