Granrey,
I wish I didn't have to give you this advice.
Based on my experience, there are very few crossover opportunities to commercial work right now. The reasons for this situation, are probably a result of the economy and the difference in the two sectors. I spoke with an old associate recently that had a 6 month battle to find work in residential project management. He was fortunate to find another residential postion three states away from his previous job. He has a lot of NAHB certifications and been in the housing industry for a lot of years. He mentioned his lack of success with commercial positions too. He said the employers/recruiters would not talk to him with his residential background. There is a bias, fair or not, against candidates with no commercial experience.
My advice...for what it is worth:
If you only have four years experience as an estimator, then you should take the courses for any certification, and move to commercial estimating. As I have said before , there are far more opportunities for professional estimators in the industrial, commercial and civil sector, then in the residential industry.
IMO, the differences between residential and commercial estimating:
The project dollar volume is much higher. The most expensive sales/buyout estimate I performed, had a hardcost of about $750,000. Most of my recent sales estimates were in the $250,000 to $350,000 hardcost range...per unit. A million dollar project in commercial work is probably not considered a high risk.
The residential industry usually customizes their divisions of work to fit the local methods for building homes. Correct me if I am wrong, but even light commercial bidders use the CSI MasterFormat for specifications and estimates? It makes sense, since it is organized in an industry accepted manner for engineers, architects, estimators, and project managers. As a residential estimator, we used three different estimating breakdowns in 15 years for estimating homes on the computer. Most of the small residential builders which are small operations, use a simple spreadsheet for a sales estimate. They use lumber yards and vendors for material quotes. They also handle their AP functions, by paying from invoices, rather then using a purchase order system. They pay their bills from monthly statements, rather then spending a lot of time on job costing their expenses. The largest homebuilders have the revenues to employ specialized estimators. But I live in an area of about 650,000 folks, and we do not have any of the big homebuilders in our market. There might be three or four homebuilders that have estimators/purchasers. But I may be overstating that number. The commercial folks have several types of estimates...five if I remember correctly? There were two kinds of residential sales estimates I performed; ballpark or detailed.
As other posters have mentioned, the commercial industry gets quality drug free hourly crafts. The residential industry relies on subcontractors. They hire the folks they need without a lot of requirements, except for attendence. The commercial contractors emphasize safety. The homebuilders sites have walkboards across unfilled garages without safety rails, ditches with no yellow tape, no fences to protect the site from theft/injuries and no OSHA signs posted.
The commercial builders use plan services/exchanges to look for work, to bid on. I am sure the best commercial contractors get their opportunities to work on projects, without bidding. There is no clear defined bidding method for residential work. The builder might be contacted by the customer directly or a real-estate agent might bring a builder a set of plans for an estimate. But there is no service in my region, that sends a residential builder the customers plans for an estimate. There are no specifications in residential bid packages, unless the customer creates the specification sheets themselves. The architects provide construction documents. The residential customers buy stock plans or pay for a residential designer to draw the plans. But there are no other documents for the residential estimator to use for third party plan estimates. I worked for a builder that used their own standard specifications, unless the alternates were described, when a proposal was presented to a customer. It usually irritated a lot of customers that wanted to pick and choose their own specifications on the bids.
The commercial estimators use excepted construction standards, such as Means. The best residential plans actually have usable sections and details on them. A lot of them do not have these details.
The developers use the same skills in developing commercial, industrial, and residential properties. So if you can pick up some civil estimating skill sets, you will have some valuable training.
IMO, The residential industry's chief player is the small builder, despite what you see about the largest builders. So the emphasis in the residential industry is on survival these days.
Mike