Design - Quote

[Airforce2]

I have been asked to put in a quote for a project where I will be required to carry out design (heatload calculation etc) as well as drawings. It will be a very basic system. There will be a couple of roof mounted toilet exhaust fans also.

The client has indicated underfloor ducting. I believe there will be 2 units required.

There are 2 buildings.

Building 1 is 3713 square feet (345 square meters).

Building 2 is 7750 square feet (720 square meters).

I was wondering if there is a basic formula to getting a more accurate quote? Say "X" amount of square feet (or square meter) per hour in design?

I am a bit torn over how many hours to put down in my quotation...

Thanks for your help,

 

[Zapster]

Use RSMeans to get the mechanical square foot cost. Determine the cost of the installed system in your area. Typically, the design cost for a PE to supervise the design and stamp the drawings is around 6%. 10% if construction services are provided.

 

[Airforce2]

Thanks Zapster for your reply. The only thing that will be difficult is finding out the final cost once installed. There are a few variables there (cheap labour, cheap materials etc).

 

[GBAILEY]

AF2,

RSMeans is updated every year with factors for project location and most of the variables are accounted for in the yearly realease. It's worth the $99 to get the book because, with a little study and work you can get the ballpark estimate you need from the publication.

GB

 

[cme]

rules of tumb:

60 hours a drawing

40 hours for spec

means books are way off

 

[Greg06]

Airforce2

I would recommend for smaller project that 6% and 10% stated above not be used. For small project the overhead of setting up drawings, files etc is high compared to larger project.
The actual % of construction value may appoach 20%.
I think there is a lot of free engineering occuring on small project it is hard to even break even with the amount of time you spend on the job. There a no large peices of equiment to offset design time.

CME's hours per drawings may work better for you if this is a smaller project.
Greg