Just Lofts can supply and fit any loft hatch to your current loft access. This could be for many reasons, your current one is old and drafty or not shutting. whatever the problem having a new hatch fitted will stop drafts and gain easy access to your loft.
Loft Hatches are available in varying sizes, however this is dependent on their manufacturing material. Plastic Loft Hatches are typically designed to fit a structural opening of 562mm (width) x 726mm (length) with there being no option for a made to measure size. Metal Loft Hatches on the other hand come supplied in a variety of stock sizes. With made to measure sizes also an option when you have a loft opening with dimensions outside of the norm.