Loft insulation and boarding

Hi I need to upgrade my loft insulation to increase the thickness to comply with current standards. I would also like the loft boarded which is likely to involve fitting extra timbers as it's a 1930's house so the thicker insulation will rise above the timber joists. The loft is already boarded so that will need removing too. I don't know the dimensions of the loft, but it's a small end-terraced house. Wondering how much a job like this might cost as I have no idea. Thanks