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Sam, depends on how you take the architect on and the scope of works you agree in the appointment.
Before meeting anyone I recommend having a little look at both the RIBA website, and also the JCT website regarding employing architects for domestic projects. They should discuss this with you anyway but its always good to have a bit of knowledge. Most likely they'll suggest the RIBA Agreement 2010. They should also be able to guide you in terms of tendering which is always useful especially when your its your entire family home
It really comes down to what you want to pay him for
but in a nutshell the working dwgs in particular detailing
remember drawing time costs
important elements would be
layouts
elevations
roof detailing
wall construction / insulation
tanking
Producing the specification
submitting the planning applications
remember the basic construction details don't vary much from build to build
get the basics from him to get you thro planning / enough basic detailing for the works to be priced by the builder
Plumbing heating electrical all can be agreed with your builder using the plans produced agree with him what you want and let them produce working drawings the engineer will produce the structural detailing needed from the architects details Inc drainage layouts also calcs for building control
if you want any advice / info drop me a pm and I'll mail over my number