The cap will help to keep rent down for families who qualify for affordable housing Changes have been approved to the council’s affordable housing policy to cap rent at 70 per cent of market value. The update to Reading Borough Council’s (RBC) Affordable Housing Supplementary Planning Document (AHSPD) means developers will be asked to set affordable housing rates at a minimum of 70 per cent of market value. Developers of sites with ten or more homes in Reading must make 30 per cent of them available for affordable housing. However, this can be reduced, or the contribution can be made off-site, if it is not deemed viable.