Old houses may have their beauty lost but with a fixes and upgrades it would back into its glorious days.
But having such structures under renovation will require a special treatment so it won't bring any harm. Homes built prior to 1978 requires contractor that is certified the Environmental Protection Agency.
Old building are most like built from materials that may bring hazards health and the environment. Paints used contain dangerous amounts of lead which could be a health if some got exposed to.
More details about this, on the link below.
Link: Why should I use a contractor that is EPA certified on
