Hey Brendon,
Kudos for digging into the development process. A couple of notes for you before I answer your question:
- Since you have construction experience and based on your post, it sounds like you are considering filing your building permit based on an "owner-builder" exemption. This allows you to build your own home without hiring a licensed General Contractor. However, you should know that Florida law means you cannot sell or lease out any portion of the property for the 1st year after construction in this case. (Local law here in Tampa may set it out even further, I'd have to look into it.)
- All of the trade work that your step dad is able to do, even if up to code will still need to be performed by licensed subcontractors. Plumbing, electrical, mechanical, even if the owner is serving as the general contractor needs to be performed by licensed plumbers, electricians, and ac technicians.
- You may be able to work past both the above issues by working with licensed contractors. A project of this size you are going to want a GC with some experience anyway. The deal you could work it is to get the GC to sub-out some of the work to you as an independent contractor in return for a discount on their price. This way you have no issues leasing right away, the work is done under the supervision of the general contractor, and you get some cost savings on the items you're able to do yourself.
- As far as the trades go, this may be a little more of a sticky issue. You're probably going to have a hard time finding an electrician who will let your stepdad do a bunch of wiring under their license. There's just too much liability here.
Now to answer your actual questions:
Cost: Easiest way to figure this out is to hire a GC to work with you and give you an estimate. Or you can get some quotes from subcontractors based on square footage.
Let's say you want to build a single story 2,000 square foot frame house.
- Call up some electricians, plumbers, and HVAC guys and ask for a rough cost. Tell them you don't need hard numbers just an idea.
- Calculate how much concrete you will need for a foundation and get a cost for an excavation and concrete foundation pour. (monolithic probably being the cheapest)
- Get a quote from a framing company (again tell them you just need a general idea) for framing a 2,000 square foot home.
- Find a drywall subcontractor and find out roughly how much to drywall and finish a 2,000 square foot home
- Get quotes from painters, bathroom, and kitchen installers. FIgure out any other materials (doors, finish trim, flooring, siding, roof tiles, etcc etc.)
A good rough number for just a home build is about $150 per square foot, but remember this is a quadplex so you need 4 kitchens, 4 bathrooms, etc etc. Again probably best to speak with a GC.
Loans:
You need to know whether you own the land or not. Most of the big banks that offer construction loans want you to own the land outright. They won't let you purchase the land with the construction loan. So they want you to buy the property in cash, then you can take out a loan for construction. Also keep in mind they won't give you the money up front and will only let you draw on the loan for work completed. So you'll need to have some cash on hand to pay to get work started. Plus you'll need to refinance a standard construction loan once you complete construction which has some expenses.
Second option is hard money. You can get hard money loans for new construction that will include the land purchase, but it can be very expensive. Will also need to be refinanced.
Third is some local banks allow you to take out a "One Time Close" loan which covers both the construction process and converts to a regular loan once you complete construction. Mid Florida Credit Union and a bunch of other local banks offer these, as do FHA lenders, but you'll need to shop around a bit.
Hope that helps, if you've got any other questions on the development process feel free to DM me.