The charity raises most of its cash to support construction workers and their families through fund-raising events across the country.
Lighthouse chiefs say funding has been “decimated” just as more callers than ever turn to its 24/7 helpline for advice.
Bill Hill, CEO of the charity said: “As a result of the Coronavirus pandemic the calls to our Construction Industry Helpline are currently increasing by over 25% a week.
“Many of the calls received are from self-employed tradesmen, agency staff or workers on zero hour contracts who cope from week to week. They are often only one or two paydays away from poverty.
“They need our help to feed their families and to pay their bills for heating and lighting.”
The charity is now appealing directly to construction companies for donations.
Hill added: “Whether you’re in a position to donate or not, we are here for you.
“Our 24/7 helpline and app will enable anyone that needs help to access emergency financial support and mental health and wellbeing information and guidance”.
To watch the appeal video click here.
To make a donation click here.