The unions launched an increased claim of 10% under the Construction Industry Joint Council (CIJC) pay agreement earlier this year.
But employers have responded with an offer of less than 4% which has sparked anger among the unions as the country struggles with the cost of living crisis and soaring inflation rates.
Charlotte Childs, GMB National Officer said: “The construction industry is facing an unprecedented skills shortage.
“Without meaningful improvements to the CIJC agreement, which sets out the minimum rates for all grades covered by the agreement, the shortage will likely worsen.
“The CIJC needs to show leadership in setting the appropriate rates for this highly skilled and highly motivated workforce – not this derisory offer.”
Pay negotiations will continue with new rates due to come in force at the end of June.