Whilst forest management certification emerged in the early 1990s as a potential market-based solution to the problem of forest loss and degradation, certified timber has not yet taken a significant share of timber and wood product markets. Although the lack of supply of certified timber is acknowledged as a problem, market barriers to the uptake of certified products are poorly understood. This study sought to identify and compare barriers to the uptake of certified wood and wood products in the UK's paper and construction industries. Findings indicate marked variation in barriers between individual companies and between the industries. Key barriers identified include: organizational constraints -strategic commitment, inadequate systems, staff skills and financial provision; supply constraints -material availability, supply chain complexities, entrenched supplier relationships; and demand constraints -lack of knowledge, weak demand, price sensitivity, traditional expectations and availability of substitutes. Ways to overcome these barriers are discussed.