It’s an unfortunate situation, but sometimes players are faced with a hole that is under construction or has temporary greens or tees in play. When a player is faced with this occurrence, the USGA Handicap System™ has procedures in place that the club handicap committee and players follow to adhere to the USGA Handicap System and keep a player’s accurate scoring record intact.
It’s important to note that as long as the Rules of Golf can be followed during the temporary period, scores are acceptable for handicap posting purposes.
The handicap committee is accountable for notifying club members when a hole is not played (closed) due to construction. The score for that hole must be posted using “par plus” any handicap strokes the player is entitled to on that hole, “par minus” for the extraordinarily good/plus handicap players. What’s par plus? See here for more info.
The handicap committee at the golf club must notify its local authorized golf association when temporary greens and/or tees will be utilized (Decision 5-1a/3). The authorized golf association will decide whether the USGA Course Rating™ and Slope Rating® should be modified temporarily, or have other procedures temporarily put into place.