The representatives - who have never looked at a potential project at the same time - will visit central Bedford to assess proposals for the town's regeneration.
It represents part of an initiative by Joyce Bridges, a commissioner for both organisations, to bring them closer together.
The commissioners of English Heritage and CABE are effectively the governing body or 'board' of each organisation, and include specialists from the fields of architecture.
An example of how far things have come is that three years ago the two quangos were locked in dispute over two significant schemes; the Coppergate Shopping Centre in York and the London Bridge 'Shard of Glass' tower.
Greg Luton, English Heritage regional director for the East of England, said: 'This exciting new joint initiative between English Heritage and CABE enables us to pool our expertise and to share ideas.
'The commissioners will visit Bedford's Castle Hill area and take a walking tour of the town centre and Riverside area to learn more about the regeneration strategies and development projects,' he added.