They spent weeks competing against each other on the biggest and toughest renovating reality TV show, but our Blockheads came together for a good cause on Domestic Blitz.

It was their chance to recognise a true community hero, paramedic Michael Wilson, who lost his life on Christmas Eve 2011 while attempting a tricky rescue of two injured canyoners in the Southern Highlands.

He left behind a beautiful and heartbroken family — Kellie, the love his life and his wife of 16 years, and three children, Eliza, 15, Grace, 12 and Hugo, 6.

"We've all been touched by the story of the Wilsons, so for us to be a part of it is just amazing," Andrew said.

As a nurse in charge of the Trauma Department at the Sydney Children's Hospital, Kellie knew better than anyone just how much Michael's job meant to him. They were both in the business of saving lives and understood and supported each other at the end of each day.

From the moment they bought their house 11 years ago, Kellie and Michael had always wanted to renovate. Last year, they had saved enough money to renovate a few things, but Michael decided that they should all go on a family holiday instead.

When family and friends sought to help the Wilsons through this difficult time, the way to do it was clear: a complete home and garden transformation — a domestic blitz.

The Blockheads and Domestic Blitz team couldn't have done it alone. The offers of assistance from tradies, suppliers and helpers was overwhelming, and without their willingness, expertise and sheer patience, the mammoth task could not have ever been completed in such a short amount of time.