The Campaign to Protect Rural England (CPRE) issued an analysis of planning and housing market data in five areas over the past decade.
Ample land is available for house building in all types of market, its research found. Permissions were typically sufficient for at least four years of building, it says.
Torridge in Devon has the most rapidly rising prices of the areas studied but the largest supply of permitted land in relation to completion rates, the report observes.
House prices in Poundbury, Dorset, have risen in spite of large numbers of new homes, it notes. This casts doubt on Kate Barker's view that lack of housing supply underlies rising prices, the CPRE said. "The contribution of planning constraints to prices is so marginal as to be virtually undetectable," it contended.
But DCLG deputy director of planning delivery and performance David Morris insisted that more houses are needed to meet population projections. Planners need to focus on getting houses built not just allocating land for them, he added.