Hundreds of volunteers have offered to help finish the Lee Rigby House in North Staffordshire.
An ex-serviceman posted an appeal after seeing only three people "struggling to get the place finished" before opening in September.
A trustee said the build is on track, but they're grateful for any help.
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The Lee Rigby Foundation was established by the mother of the fusilier who was murdered in Woolwich in 2013 and has gone on to set up the Lee Rigby Home in Oakmoor.
Keith Lawson visited the home to do some work on Wednesday and said his phone has been "ringing off the hook" since he shared the post online.
"The people working there are veterans themselves.  I expected to see a house full of people beavering away so I was surprised when it was just three of them.
"Already we've filled five A4 sheets of paper with names and phone numbers of trades people that want to help."
The building for Lee Rigby House was donated by local charity, the Kendo Nagasaki Foundation, and will house seven people at a time.
The foundation runs purely on volunteers, and Roz MacDonald is one of two trustees. She says the house will offer somewhere for people to unwind.
"Nobody else is doing quite what we're doing.  Here is it just completely peaceful, people can feel the weights of their problems being lifted."
The charity is looking for people to help with finishing touches including furnishing, flooring, and landscaping.
Work has been ongoing for two years and the charity feels confident the house will be completed by September.
Ms MacDonald described the response as "tremendous- the most welcome deluge".

The company's decision last week to grant the equivalent of a 50% pay rise to six top executives sparked outrage.
Quebec's government agreed to a CA$1.34bn ($1bn; Â£800m) bailout in 2016, a year after it teetered on the edge of bankruptcy.
Prime Minister Justin Trudeau said he was "not pleased" with the pay hike.
But he welcomed the change of heart.
Protesters gathered outside the firm's headquarters in Montreal on Sunday, hours before Bombardier relented and said the rises would be deferred to 2020.
They will be payable only if the firm achieved performance goals, it said.
"Over the past 75 years, our fellow citizens have always been by our side," said Bombardier chief executive Alain Bellemare on Sunday night.
"It is because of this deep relationship that we are sensitive to the public reaction to our executive compensation practices."
He was one of the six executives who were set to receive payments of CA$43.7m ($32.6m; Â£26.1m) in 2016.
That was up from CA$30m the year before, according to regulatory filings.
Bombardier originally justified the pay increases as a necessary measure to retain top talent.
But two Quebec cabinet ministers pressured the company last week to heed the backlash.
The Quebec Premier Philippe Couillard tweeted that he was "satisfied" with Sunday's climb-down by the firm.
The Quebec government last year invested CA$1.34bn in Bombardier's C-Series aircraft programme in return for a nearly 50% stake.
In February, the federal government agreed to give the company CA$372.5m in interest-free loans.
In 2016, Bombardier also announced lay-offs for 14,500 people, including about 20% of its workforce in Belfast.
The redundancies came as the firm secured orders with Delta Air Lines and Air Canada and made its maiden commercial voyage with Swiss Air Lines.
A Facebook post asking for help to complete a retreat for veterans and service families has been shared nearly 50,000 times.
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Canadian plane and train manufacturer Bombardier has said it will defer some hefty executive pay increases following a public outcry.