Does your loft have enough internal height to be converted to a room.
2400mm from the loft floor (plasterboard) to the highest part of the ridge?
If you do not have 2.4 Metres, then it's very unlikely, unless the ceiling of the room below the attic is high enough that it can be reduced to compensate.
Builders who carry out loft conversions / alterations regularly 'may' not require plans to explain how works should be conducted to comply with Building Regulations, subject to the complicatedness of the particular job.
Building Notice forms and a letter of Planning Exemption, may suffice where Planning Permission is not required.
Customers who are able to ensure that builders properly explain all design options, so they the customer can compare product and price, plus ensure that product is received, may not require plans.
Further to the above, the stairs could be designed and installed by a stairs specialist, simplifying the work for the builder.
In addition to above mentioned 'Building Notice' and Planning Exemption you may opt to call me out purely to obtain independent verbal design advice. This takes several hours and includes steel and timber sizes, calculations as necessary. If customer has chosen a builder who is unsure of a few points, this builder could be present at the meeting.
Alternatively customers 'may' pay for design advice and detailed plans for a number of builders to quote, in which case the builders prices will be easier to compare, as all builders will be contracted to carry out identical work as per plan.
Identical homes will have loft conversions, however some of these lofts end up with better stair design and use of space plus more headroom than others.
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