A TikTok user called Jo, who is renovating a 1920s detached house in Cheshire, shared a video showing the conversion.
The footage read: “We wanted to transform this wasted space and needed more storage.”
The family was given a figure of £24,000, so decided to do it themselves for just £5,000.
They used railway sleepers to put a border around the trees before building a sturdy timber frame base.
It took just two days to construct the log cabin, which arrived on the back of a lorry.
After saving £19,000, social media users were quick to react to the video, which has more than 37,000 views.
One said: “Come round to mine I’ll pay that.”
Others were less impressed with one saying: “But you purchased a cheaply made Dunster cabin.
“Two or three years max and you will start having problems with it.”
Another asked: “Why did you need slabs?”
Jo responded: “To lift it off the ground and also to ensure it was level.”
It comes after a woman transformed her drab garden into the Love Island Villa on a budget.
Casa Lawson took to TikTok to show off the incredible garden makeover.