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    Wiring a 5000+ square-foot house

    I just met a builder today, and he mentioned about possibly building some 5000+ square-foot houses south of Ann Arbor in Washtenaw County. I've never wired a house that large before. Would I likely need more than a 200A service for such a dwelling? How much would electrical contractors typically charge for the wiring (base price)?

    #2
    I've never seen a house that large with less than a 400A service. Not saying they have that much load, but I find people with that size house think they need larger. Of course, you would need to know the load to decide. There are a few around here that are 600A and one that is 1200A.
    I would want a set of prints for these houses to make a bid off of. Most usually, one this size would be custom and you need to charge extra for that.
    brantmacga will probably see this and can help more since this is along the lines of what he wires in residential.
    [COLOR=navy]If you aim at nothing, you will hit it every time![/COLOR]

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      #3
      Originally posted by jeff48356 View Post
      I just met a builder today, and he mentioned about possibly building some 5000+ square-foot houses south of Ann Arbor in Washtenaw County. I've never wired a house that large before. Would I likely need more than a 200A service for such a dwelling? How much would electrical contractors typically charge for the wiring (base price)?
      I know it’s aggravating until you have done it a couple of times, but now would be a good time to practice the service calculations in 220. Once it’s in your head and your familiar with it, it will become easier to walk in a house and make an educated guess.
      Until then it’s just a WAG. Doesn’t even qualify for a SWAG...

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        #4
        Originally posted by jeff48356 View Post
        I just met a builder today, and he mentioned about possibly building some 5000+ square-foot houses south of Ann Arbor in Washtenaw County. I've never wired a house that large before. Would I likely need more than a 200A service for such a dwelling? How much would electrical contractors typically charge for the wiring (base price)?
        I started to compose a more detailed response but backed it out as it would come across as to harsh. I'll just say that you need to know what the Article 220 load is. Load and price has little to do with square feet.

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          #5
          Jeff, I agree with the others. Main variables include cooking and HVAC loads (which require their own calcs), and extras like auxiliary buildings, swimming pool, etc.

          The bigger the job, the worse it is to try to price by footage alone. You need real plans, real device and fixture counts, and real load calculations. It's worth learning.
          Master Electrician
          Electrical Contractor
          Richmond, VA

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            #6
            Spec houses?
            " How much would electrical contractors typically charge for the wiring"
            Typically someone will bid it at a price that will eventually cause them to go broke, I never figured out how to beat their price
            Think for yourself, while its still somewhat legal!
            Clarkesville, Georgia

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              #7
              Originally posted by jeff48356 View Post
              ....... How much would electrical contractors typically charge for the wiring (base price)?
              Not enough info. Gas or electric appliances? One or more 'kitchens'? How is it heated / cooled (gas-fired furnace(s), geothermal etc). How many can lights? Home theater?

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                #8
                Originally posted by 480sparky View Post
                Home theater?
                I almost mentioned that. I have a 50a 120/240v sub-panel in my equipment stack closet:


                :
                Master Electrician
                Electrical Contractor
                Richmond, VA

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                  #9
                  Milbank makes a nice 320 w/ two 200A disco's....



                  ~RJ~

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                    #10
                    Post # 3 & 4

                    Roger
                    Moderator

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                      #11
                      Originally posted by romex jockey View Post
                      Milbank makes a nice 320 w/ two 200A disco's....



                      ~RJ~
                      That can be problematic if remote on a pedestal due to the "single supply" rule, but ok if on house.
                      Ethan Brush - East West Electric. NY, WA. MA

                      "You can't generalize"

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                        #12
                        I don't know what it will cost, but I bet it's more than you bid.

                        I'm saying that because it seemed to me that when I went from production housing to custom homes (yea I did a few in the mid 70's), production rate went down.

                        If this is a new relationship with a builder, be cautious. Better to not get it than get it and wish you didn't.

                        Good luck (and listen to these guys on the forum).

                        Comment


                          #13
                          The largest custom home I did, back when I did them, was 4000 plus the finished basement IIRC.

                          I was given floor plans by the GC and created my own electrical from it or modified theirs. Bid was based on that, then a walk through with both owners prior to rough in with price adjusted at that time. Cost/opening plus service.
                          Tom
                          TBLO

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                            #14
                            Just roughed a 5000 sq ft house..... 225A service, base price of $50k, with recessed lights total of $70k. Includes no LV as they can’t make their minds up. Probably will end up north of $100k in the end.

                            Someone else would probably do it for half that 🤷🏻‍♂️


                            Sent from my iPhone using Tapatalk
                            [COLOR="Blue"]Brought to you by Carl's Jr.[/COLOR]

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                              #15
                              Originally posted by brantmacga View Post
                              Someone else would probably do it for half that 🤷🏻‍♂️

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