A floating window seat, a sunken roof terrace and a basement cinema room feature among the 33 projects shortlisted for Don't Move, Improve 2016 – a competition to find London's best home extensions (+ slideshow).

Now in its sixth year, the competition is organised by New London Architecture (NLA) – an independent forum dedicated to new architecture and construction in the capital – in association with Dezeen, Heal's and the Royal Institute of British Architects.

Other projects to make the shortlist include House of Trace, a project designed to reveal "memories of place and construction", Sanderson House, an extension that resembles a fox; and The Lantern, a project with a two-storey-high window.

There are a handful of roof extensions and loft conversions on the shortlist, including Reighton Road, a copper-clad roof extension; and Shoreditch Loft, a renovation that creates a new contemporary living space.

Other additions include a garden room with pivoting doors, a reorganised apartment with an exposed concrete structure and a monochrome kitchen with a zigzagging profile.

Dezeen's architecture editor Amy Frearson and NLA chairman Peter Murray were among the judges for the award. The overall winners will be revealed at a reception on 21 January 2016.

Any home extension or improvement project completed within the last two years in one of London's 33 boroughs was eligible for entry.

Last year winners were announced in two categories. First place in the home extension category went to a timber-framed extension to a 1960s terraced house in Gospel Oak by Maccreanor Lavington, while the home improvement category was topped by a Bloomsbury residence featuring glass walls and simple furnishings.

A longlist of 84 projects will go on show in the NLA gallery at The Building Centre, from January to March 2016.

Scroll down for the full Don't Move, Improve 2016 shortlist:

» Bhalerao House, Brent, by Paul Archer Design
» Brackenbury House, Hammersmith and Fulham, by Neil Dusheiko Architects
» Calabria Road, Islington, by Architecture for London
» Camden Townhouse, Camden, by Ben Adams Architects
» Clock House, Islington, by Archmongers
» College Road, Brent, by Russian For Fish
» Craig and Siobhan’s Place, Wandsworth, by Alexander Owen Architecture
» Cut and Frame House, Enfield, by Ashton Porter Architects

» Extension One, Islington, by Denizen Works
» Facet House, Hackney, by Platform 5 Architects
» Fitzrovia House, Camden, by West Architecture
» Folds, Haringey, by Bureau de Change Architects
» Grange Yard, Southwark, by Michael Trentham Architects
» Harcombe, Hackney, by Forrester Architects
» Healey Street Rooftop, Camden, by Alan Morris Architect
» House for Agnes, Hammersmith and Fulham, by Tigg Coll Architects

» House of Trace, Lewisham, by Tsuruta Architects
» Jam Factory, Southwark, by Gibson Thornley
» Kelross House, Islington, by Paul Archer Design
» Kenworthy Road, Hackney, by Chris Dyson Architects
» London Fields, Hackney, by Scenario Architecture
» Max House, Islington, by Paul Archer Design
» Nook House, Hackney, by Mustard Architects
» Reighton Road, Hackney, by Poulsom Middlehurst

» Sanderson House, Islington, by David Kohn Architects
» Sewdley Street, Hackney, by Giles Pike Architects
» Shepherd's Bush Extension, Hammersmith and Fulham, by Studio 30 Architects
» Shoreditch Loft, Hackney, by Levitate
» Talbot Road, Haringey, by Lipton Plant Architects
» The Gables, Camden, by Patalab Architecture
» The Lantern, Richmond, by Fraher Architects
» Turney Road, Southwark, by Ian McChesney
» Warner House, Camden, by Inside Out Architecture