Albert is a developer. Bea is the owner of a block of land upon which she intends to build a house. Albert and Bea enter into a contract for Albert to build a house for RM 75,000. The contract contains no provision for the price to increase in line with price rises in materials. The price of materials rises significantly. Albert wants an extra RM 10,000 to continue. Bea agrees and Albert builds the house.

Does Bea have to pay the extra RM 10,000?