

Construction costs will, of course, be dependent on the quality of materials and workmanship you’re aiming for. But, as a basis for working out an initial budget, £1.5k per sqm is a reasonable estimate for your construction costs, to which you should add a contingency of 20% for unexpected remedial work.
So, were you planning to convert your existing kitchen of 20 sqm and add an extension of 15 sqm to give a combined area of 35 sqm, you might reasonably budget for construction costs of around £60k.
Based on construction costs of £60k, you might allow for the following fees:
1:0 Preparation 
£ 0,900 
23: Concept & Developed Design 
£ 2,700 
45: Technical & Specialist Design 
£ 3,600 
67: Construction; Use & Aftercare 
£ 1,800 


00: Total 
£ 9,000 

