This is a very common dilemma for homeowners, particularly those doing modest kitchen extensions or interior alteration work on a budget. The short answer is no, not necessarily. HOWEVER, I definitely wouldn't recommend skipping the design/drawing phase of the project completely.
You need to apply for planning permission to extend or add to your house in the following circumstances: Any part of the works are higher than the highest part of the roof of the existing house. The height of the eaves of the extension would be higher than the eaves of the existing house.
Designing an extension Find an Architect. Find Architects near you, discuss your project and get quotes. Find a Structural Engineer. A structural engineer can provide structural calculations or carry out a structural inspection on your home. Find a Builder.
Designing an extension Find an Architect. Find Architects near you, discuss your project and get quotes. Find a Structural Engineer. A structural engineer can provide structural calculations or carry out a structural inspection on your home. Find a Builder.
Nothing to stop you using your own drawings, I did just that for an extension I built. You just need to make sure you have all the relivant Information on them. I just copyed the Info from a ``professional'' set of plans, our local planning portal is handy for this!