What is the best method and timing for resigning from my job and what should I tell my employer?

Resigning from your construction job is always an unpredictable event because it effects many company circumstances and many people including your boss, colleagues, subordinates and clients. While some my be happy for you and your new opportunity, others who are dependent upon you may be disappointed and even angry with you abandoning the team. When resigning it is wise to expect the worst and hope for the best outcome.

You should prepare your reasoning for your departure well in advance, and keep your story and all explanations to a minimum. The golden rule for resignations is, "The more you say the more you have to explain and defend." Most people with your current employer will not understand your decision no matter what you say or how you say it so it is best not to say too much. It is easier for them to give you the benefit of the doubt (rather than confirm their fears).

An employer who values you will likely press you to stay, and press ;you for information to help him or her prepare their arguments to keep you.
They will likely ask you what role, pay and firm you are going to work for in order to craft an appropriate response or counteroffer. If you are open to a counteroffer this information will help them but it you are not (and you never should be open to a counteroffer), you should avoid providing ANY details other than you have already made a commitment and are not open to counteroffer discussions. Again the more information you provide them they more you open yourself up to additional discussions which will only end in the employer investing needless time and effort in hope to change your mind. The fact is, the more an employer invests in crafting a counteroffer the more frustrated they become when it is turned down. Spare them the exercise and frustration.

It is appropriate to let the employer know you will discuss more of the details at a later date once your new employer has properly introduced the new hire to its employees, and to mention any facts about the new position that will reduce their anxiety. For example, I will be relocating, or I am moving as a result of personal goals (family), or the new employers is not a competitor, or the decision had nothing to do with anything negative or pushing you out at the current employer, etc..

When resigning it is always best to submit a written letter of resignation as the first step which sets the stage with a degree of certainly and finality to your position.

Given the chance that the resignation will likely create emotional stress on you and the employer, it is best to give your resignation on a Friday or right before a holiday so emotions can settle down with you not in the office.