The employer has a duty of care to take reasonable steps to ensure the workplace is safe for employees and visitors; this may be the reason for carrying out refurbishment. It seems odd that an employer is able to close a workplace for this period of time and expect to regain their share of the market again afterwards. It would seem unlikely that most employees would be able to accept 8 months without pay and redundancy may be considered for employees who satisfy the requirements, remember as a part time worker you are entitled to the same rights as a full time worker and redundancy is a potentially fair reason for dismissal
There is strength in numbers, if you are a member of a trade union get them involved, speak to your colleagues who are in a similar position and approach your employer to establish their intentions.