Building regulation drawings plus structural calculations

Hi,

We are planning to do a kitchen extension and need some drawings to submit to building control with supporting calculations/report.

Nothing too complex but around 7 small lintels/beams need to inserted so I guess it needs the calculations done.

We have already got the planning permision so all dimensions are there but just need to prepare working plans for building control and also so our builders know what to construct with all details.

Borough is Merton. At top we wish to pay £350 for both services.