A proper architect, appointed from the start should charge a flat fee based on the level of service required, and as a percentage of the construction cost.|
For example if you are doing a full extension with kitchen/bathroom etc and you want design (which is important and a service to pay for - you can always spot who has got the builder to lay something out on a bit of a4 paper to cover planning and warrant), planning and building warrant submissions and even some details of the construction of the thing, along with site supervision and payments to builders (if that is required) then you are looking to shell out up to 7% of the cost of building it.
On the other hand if you only want a set of planning drawings and warrant drawings to take to a builder to knock up in his usual manner then it would be less, but not below about 3% i would say.
#9423614, By Nexus_6 Building extension costs
Nexus_6 3,971 posts
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