Kitchen reno tips from Michael and Carlene Duffy

Much of this episode is taken up with a somewhat bizarre wedding vow renewal ceremony for Sonny and Alicia, which, nice as it is, takes teams away from the work site for an entire day.

But at least it provides an opportunity for Britt and Alicia to somewhat build bridges after their an unpleasant week of animosity.

“It was beautiful, it was really nice,” Britt says of the ceremony. “I think the ice was broken a bit. They’re here for their kids, we’re here for ours.”

Frenemies Alicia and Britt at Alicia’s wedding renewal party.

Then it’s on to another opportunity to win cash with each team presenting their home’s sustainability features in an attempt to be deemed this year’s greenest house.

Taz is well prepared, showcasing the vegie gardens, greenhouse, chook pen made of site offcuts, extra solar panels to heat their sauna and hot tub, underfloor heating and the use of timber from fallen trees in their landscaping – a cheeky inclusion given Taz took every last stick of free timber on offer leaving none for anyone else.

Ben and Emma have a grey water treatment system which uses water from their house on the garden.

Sonny and Alicia have used recycled bricks for their fireplace and barbecue, reclaimed timber for their decorative beams, vegie garden, water tanks and an eight- star rated clothes dryer.

At the other end of the scale sit Mat and Robby, who forgot about the challenge entirely and can only offer “I recycled yesterday” in their presentation.

Han and Can find out they’re broke.

After Han and Can make their pitch, they’re hit with some bad news when Scott Cam tells them they’re flat broke, even with the $50,000 cash injection all teams were given several days before.

They’ve burned through it just paying previous weeks’ invoices and are $6000 in the red, staring down the barrel of not having any money left for landscaping. Yet Han is still determined to insulate and plaster their outdoor shed to create an art studio that future buyers could seek a permit to turn into a habitable space.

It’s madness. Foreman Dan had earlier tried to dissuade her, and now Scott Cam does his best too, but Han forges on, taking on the job of plastering and insulating on her own to save money.

“I didn’t realise how grave the situation was,” Can says. “There’s massive concern about completing.”

Britt offers Han her tradies.

Britt gets wind of how down the girls are and heads to their shed where Han is forlornly plastering to give her a pep talk.

“How can we help?” she asks Han, offering her the use of her chippies to come and hang some doors.

“It doesn’t feel right,” Han protests.

“Your buyer is not my buyer. You’re not my competition. I want you guys to do well,” Britt insists before leaving to tell an incredulous Taz about the offer she’s made.

“These are the same people that were absolutely rinsing us on Monday,” he points out, followed by footage of Ben and Han suggesting the other teams conduct an arson attack on Britt and Taz’s deck.

Britt shrugs his protests away.

“Kill them with kindness,” she says.

Taz finds out Britt has offered their tradies to Han and Can.

In a later interview with producers Han can only acknowledge Britt’s offer through gritted teeth.

“That was very nice of her,” she says.

But the uneasy peace appears to be over when the cashed up serial winners Britt and Taz take out the whopping $20,000 sustainability prize, the day after winning $10,000 in a baking challenge.

“I don’t know why they won. They had smart appliances?” Ben asks.

The ecstatic faces of Sonny and Alicia and Mat and Robby when Britt and Taz win yet another prize.

“There is no way in hell that they should have won that at all,” Mat agrees. “Their whole house has underfloor heating which is not energy efficient. That is the most unsustainable house on the street.”

His response is somewhat rich given when he gave his pitch for sustainability he

began with “I found out about this 30 seconds ago”.

(And fact check, Mat: underfloor heating is considered an energy efficient heating method.)

Alicia and Sonny and predictably seething too, with Sonny claiming that much of the fallen timber claimed by Taz is sitting unused.

“How sustainable is that? Some of it could have gone in my yard.”