Standard fees are based on the following assumptions:
- The Building Control work needed is in line with the average time used to calculate the fee.
- The project does not include unusual, experimental, or highly complex designs or materials.
- The work will be finished within 2 years.
- All design and construction work is carried out by suitably competent people.
- Any electrical work is carried out by someone registered with a Competent Person Scheme (a government‑approved register)
- For minor domestic projects, the Building Notice fee covers both plan checking and inspections.
- Each basement level is counted as one storey.
- If more than one extension is built at the same time, their internal floor areas can be added together to work out the fee.
- If part of an existing building is demolished and rebuilt as part of an extension, the fee is based on the total rebuilt area plus the new extension.
