3d modeling cost

[CadDad]

I am looking for detailing costs per square foot for plumbing.

[cadbyken]

The can vary a lot.  Depends on the buliding type (school, office building, hospital, etc).   Getting a general number from other contractors would be difficult because of the competitive nature of what you are asking.

[CadDad]

That's what I thought. The project is a small medical building and we were requested plumbing modeling services. There are no plumbing plans to base an estimate from which is what we usually use.

[jhoward]

if you don't have any plans of any kind how are you bidding the job in the first place ?

T&M the whole project...... that sounds like the only option to me.

[cgb]

Saw this old topic ad I though I would resurrect it.

I and others I know figure that a fully coordinated mechanical model excluding HVAC, with sleeving drawings, interference done and installation drawings for the plumbers and fitters to install the model costs between 4.5% and 7% of the direct labour.

So a job with 20,000 hours has somewhere 900 and 1400 hours of drafting.   The tighter the job the higher the cost.   Design build jobs go even higher because they seem to keep changing. 

I think that HVAC costs will be lower but I am not sure.

What are others experiences and rules of thumb?

Colin

[lsm_drafter]

Saw this old topic ad I though I would resurrect it.

I and others I know figure that a fully coordinated mechanical model excluding HVAC, with sleeving drawings, interference done and installation drawings for the plumbers and fitters to install the model costs between 4.5% and 7% of the direct labour.

So a job with 20,000 hours has somewhere 900 and 1400 hours of drafting.

Colin

FTFY 

[cgb]

thanks...   

[cjehly]

you have to remember that those hours (whatever the estimate) is compressed into the 1st 25% of the total job schedule as well.  You could bid it, have an accurate estimate of total hours to model it, but not have the man-power to pull it off in that time frame without going into massive amounts of overtime (or OWN-time).

You also have no idea of how difficult coordination is going to be.  The main reason people ask you to quote blank sheets is because they'd rather lock in a generic number based on sq.ft then a true number based on actual drawings. (in other words, that job will suck, almost every single time).

[cgb]

you have to remember that those hours (whatever the estimate) is compressed into the 1st 25% of the total job schedule as well.  You could bid it, have an accurate estimate of total hours to model it, but not have the man-power to pull it off in that time frame without going into massive amounts of overtime (or OWN-time).

You also have no idea of how difficult coordination is going to be.  The main reason people ask you to quote blank sheets is because they'd rather lock in a generic number based on sq.ft then a true number based on actual drawings. (in other words, that job will suck, almost every single time).

Agreed.  I have used my 5-6% rule to try and get employers to allocate appropriate man power and have been told " It never took that long before"...   Well conversation is over at that comment and no extra help and everyone screaming when the sleeves where not laid out in time.    Ugly ugly situation.

   

[bparrell]

10% of contract price. 6% is just to keep people employed.

[cgb]

10% of contract price. 6% is just to keep people employed.

Not sure of what exactly what you are trying to say here.   Are you saying that modeling costs 10% of the total contract including labour, equipment and other materials?     That's significantly more than 7% of direct labour.  We would never get a job if we put that in for drafting.  10% of contract could be  3 or 4 times 7% of direct labour.

[bparrell]

Labor

[Zorg]

I quote per base design drawing, making exceptions for basements & roof tops for plumbing as their is more detail and coordination work. Generally it's safe to say 6-8% of the contact's value should be spent on drawings and you find places to make money on the drawings as you go. Depends how good the base design drawings are and where you can flag coordination hot spots early on. If you're managing a team or have subbies, I would hold off giving work in those troublesome areas until the job comes together a little more and everyone needs it done 2 weeks ago. Tends to get the problematic areas sorted out much quicker when they want to get plasters and such in there to finish off.

I always price 1 issue per stage as well:

Preliminary
Approval
Construction
Record (20% of the total above is 9/10 safe  ).

[Tstright]

I am looking for detailing costs per square foot for plumbing.

Ours is based off of field labor. Usually between 8%-18% depending on the type of job.

[cjehly]

I am looking for detailing costs per square foot for plumbing.

Ours is based off of field labor. Usually between 8%-18% depending on the type of job.

10% used to be a given.

 That is not the case in LA anymore, in fact its almost 1/2 of that (or worse).