The Housing (Sale of Houses) Regulations, 1995, governs the sale of rented houses by local authorities to tenants and provide that the purchase price is the market value as determined by the local authority in its existing state of repair and condition. Discounts of 3% on the value of the house are allowed for each year of tenancy, up to a maximum of ten years, plus an additional discount of £3,000. Valuations stand for a maximum period of one year or such lesser period as the local authority may determine. Any improvements carried out by the tenant are disregarded in calculating the sale price. A tenant may contest a local authority valuation by submitting a valuation certificate from a qualified valuer in support of the claim. In the event of significant variation between the two valuations the local authority may refer the matter to the Valuation Office for adjudication.