Anxiety is the symptom of uncertainty, and I know that working through the process of design and budgeting requires a great deal of work for the remodeler and the client. One of the biggest reasons for the anxiety in renovating is that most people know someone who has had an awful experience with the cost escalating during construction. In the almost 25 years in business, I still haven’t found these hidden costs because construction is not a series of unknowns, it is a series of should have knowns (with only a few exceptions).
One item that is always an unknown is what lies under the soil if you are digging a foundation. There could be ledge, clay, or a personal experience I had at one project: a subterranean peat bog. If you are building an addition and talking with your construction expert, you should ask (if they didn’t mention) what sort of challenges can be found and the approximate costs. Knowing your options in advance will reduce the uncertainty and also provide you with information on where you will need to be with the budget.
Another common item in construction on older homes is asbestos. The most visible asbestos is linoleum floor tile, and as a rule of thumb if it measures 9 inches by 9 inches, it probably contains asbestos. We work on many homes in Wellesley, Mass. That were built by a man named Porter, and we know that even if we cannot see asbestos, if the home is a certain age and has warm air heat, the ducts in the wall will have a paper coating that contains asbestos. Generally, the removal of one area is approx. $1,500 for professional mitigation and based on experience we usually add this to the budget as an allowance so that there is money in the budget to cover the additional cost.
Termite and other pest damage can also be found, and I could make a list of some pretty ridiculous things clients have told me they were charged extra for, but I believe the onus to do a thorough inspection of your property and divulge any potential additional work lies with the experienced professional you are working with. If they say they don’t know what is in your walls, they may not have opened enough