Currently have a 3 bed semi detached with two decent sized bedrooms and a box room converted to home office. Have a toddler and baby so need a solution to give them their own rooms and a loft conversion seems the way forward. To move to a bigger house in the area will be another £150k so is out of the question. We have a good loft space and could make it the biggest room plus en suite. Now, budget. No idea really how to forecast this as totally new to it but it would all need to be done by trades. All in company would be best as we want minimal hassle and want it done as quickly as possible, won’t be easy with a 2 year old and a 5 month old baby, but appreciate this will be far more expensive. What we want is a rear dorma and hip to gable at the side for maximum space and headroom. 35 sq metres roughly. We are on the south coast fyi.
What sort of ball park budget should be realistic and what other considerations before proceeding?