Construction almost always goes over budget(money and time). No matter how experienced you are, there are always things that can't be forseen. When planning projects years ago as a town engineer, I'd add 25% to the money and a month or two to the time. That way I looked like I knew what I was doing.
On the other hand, I started my house in 88, we moved in in 99 and its still not finished because everything is now in the way. I ran over budget because I hit ledge when digging the cellar hole and boulders everywhere. I spent 1000 hours digging with my AC HD6G and another 1000 hours repairing her. There was an area 20' x 40' x 2.5' of granite that was in my way. It took most of a summer to take it down. I couldn't blast because of cost and the damage it would do to the ledge that I was going to pour my footings on. That cost me a year and a few thousand.
We poured the foundation with my home built forms. I planned to use the 2" x 4" s and plywood from the forms for framing the house. I ran into problems with the cellar hole sides collasping in on the foundation walls before I was ready. It became a slow and difficult process to dig out, put in drainage, waterproof, insulate, and back fill around the walls. This cost me over a year. Then my wife had an accident and I had to take care of her for months. Then she got pregnant and I got a very intense project at work for two years.
When I got the time(it was 5 years after pouring), it turned out that 1/2 the wood had rotted. IT had been stickered and covered but mice got in and made a mess that held water. It was a long struggle but worth it. Someday, I'll finish the bathroom and do the trim work. We live comfortably and cheaply in our passive solar house.
Building a project is like a hitch in the military: get through it and don't do anything that you will later regret. Good Luck, Rick
Edited by boyscout862, September 10, 2013 - 07:29 AM.