Dogs and cats aren’t the only rescues at the animal shelter.

The Castaic Animal Shelter is in line to get a new spay-neuter clinic and administration building, and the county supervisors will consider awarding the construction contract Tuesday.

The expansion of the shelter at 31044 Charlie Canyon Road has formally been in the works since February 2012 when the supervisors approved the project and budgeted $1.86 million for it.

Design work started, but then soils testing found that the ground would be too susceptible to liquefaction in an earthquake. That added about $1 million to the price tag.

The supervisors approved a revised $2.9 million total budget in July 2013 and the county put the approximately $1.8 million construction part of the project to bid.

There were 18 bidders. The low bidder didn’t file all of the necessary paperwork, so county Administrator William Fujioka is asking the supervisors Tuesday to approve a $1.848 million construction contract with the second-lowest bidder, Woodcliff Corp., a general contractor in West L.A., and a total project budget of $3.17 million.

If all goes according to plan, construction would start next month and the new buildings would open in June 2015.