Don't Move, Improve! is an annual contest organised by New London Architecture (NLA), to champion "emerging trends, imaginative design and original problem-solving" in home renovation and extension projects.
A kitchen that celebrates exposed materials, a corten-clad roof extension and a series of hobby rooms for a retired couple also made the shortlist for the annual award, which is now in its eighth year.
Other projects recognised include a ramped Victorian workshop, a garden library and a refurbished water tower.
Any house extension or improvement project completed in within the last two years, in any one of London's 33 boroughs, was eligible for the contest.
Judges included Dezeen editor Amy Frearson, NLA chairman Peter Murray, architect Carl Turner, Ash Sakula co-founder Cany Ash and Levitt Bernstein architect Zohra Chiheb.
The overall winners will be revealed at a reception at The Building Centre in London on 25 January 2018. An exhibition of 120 submitted designs will be unveiled at the same time.
The winner of last year's awards was a garden room containing a sunken Japanese-style bath.
An extension featuring a lookout post clad in wooden shingles and a garden studio dedicated to rug making took second and third place.
Here's the full Don't Move, Improve! 2018 shortlist:
Amhurst Road, Hackney Downs, by Poulsom Middlehurst
Black Ridge House, Walthamstow, by Neil Dusheiko Architects
Burnt House, Maida Vale, by Hayhurst and Co
Corduroy House, Hackney Downs, by Manalo & White
DA Residence, Walthamstow, by deDRAFT
Greswell Street, Fulham, by Simon Gill Architects
Greville Road Studio, Kilburn, by Syte Architects
Manor Road, Stamford Hill, by Paul Archer Design
Pitch Perfect, Peckham, by Nimtim Architects
Pop-Up Ute, Chalk Farm, by Friend and Company Architects
Rachel's House, Haggerston, by Paul Archer Design
Reading Room, Belsize Park, by Studio Carver
SE5: Garden Library, Camberwell, by Turner Architects
Slope House, Nunhead, by Poulsom Middlehurst
Sun Rain Rooms, Finsbury, by Tonkin Liu
Taper House, Barnes, by Mustard Architects
The Copper Lookout, Holloway, by Beasley Dickson Architects
The Triangle, Clapton, by Yellow Cloud Studio
The Water Tank, Keeling House, Haggerston, by Brian Heron Architects