During the project’s pilot, 249 artificial nest cups were installed on buildings close to known nesting sites across northern and eastern Hampshire.
Twenty seven were used by house martins this summer, more than the project team had expected.
Keith Betton, chair of Hampshire Ornithological Society, said: “The response to the first pilot stage of this project showed how strongly people across Hampshire want to help house martins.
“This next phase turns what we have learnt into action by offering hundreds more safe, ready-made nests.
“It gives homeowners, schools and businesses a simple, practical way to support the recovery of this threatened bird.”
To quality for a cup, which are provided and installed for free, properties must be within 1km (0.6 miles) of a previously recorded house martin nest.
Host buildings must have suitable overhanging eaves at second story level, between four and seven metres from the ground.
Applications for the nest cups can be made on the Hampshire House Martins Project, external website.
