What are some factors that I should consider.
As far as your internal rates used for calculating price is concerned:
* labor cost including benefits and taxes
* overhead cost including all insurances, indirect labor (supervisor, estimating, bookkeeping, receptionist), legal, licences, 20 others. Even if the indirect labor is you, you have to charge for it or you are working for free.
* material costs with a healthy markup (at least 2 times the shelf price, some suggest up to 6 times on small items). The markup covers your cost of going to get it and carrying it around on the truck. (weight = gas and wear and tear)
* vehicle/travel costs (Not just gas and oil. Depreciation, insurance, maintenance and repairs, tires) IRS say average vehicle cost is 56 cents a mile. A service truck is probably $1.00 a mile.
* desired profit (Don't be stingy here. This is why you are running a business.)
Get every penny of your costs in there. Every penny you forget, comes right out of your profits.