Grand Designs host Peter Maddison's Byron Bay reno

Television viewers never got to see 4 Palm Valley Drive in Byron Bay on Grand Designs, but its been the work in progress of the host Peter Maddison for the last two years.

The acclaimed architect has been working on the beach home, renovating the luxury Byron Bay Beach house, Wattai, which sold for $5.6 million to a Melburnian.

Janis Perkins of Real Estate of Distinction secured the sale for Melbourne property developer, Allan Sinclair, father of Sydney Swans footballer Callum Sinclair.

He paid $3.7 million for the home in 2004.

Set on the path to Watego's Beach, each of Wattai's four bedrooms come with ensuites. 

Set on 790 sqm, the home includes a large self-contained flat which leads to an outdoor decking, fitted with bbq area and a salt water wet edge pool. 

The most striking feature of the home is the 183 sqm rooftop terrace, complete with a 10 person spa.

It's going to be a busy year for the Melbourne-based architect.

On top of juggling his own business, Maddison Architects, he is renovating his family home in Brighton.

The family moved out of their mid-century home they've lived in for 15 years to allow the work to be done.

Maddison paid $790,000 in 2000 with the project costing a lot more money expected and it's taking a lot longer than he thought. 

"It's costing a lot more and it's taking a lot longer than I thought ... but it's coming along," he laughed.

"The plan is to renovate being sympathetic to the home's unique 1960s styling elements while adding a fresh touch."

Grand Designs Australia airs on The LifeStyle Channel and has been running since 2010.

Maddison will hope he is a little more successful than British counter-part Kevin McCloud in the property market.

McCloud, who present the British Grand Designs, has come under fire for his recent eco development in Stroud, which is said to be riddled with damp and unsafe to live in.