Archello Awards 2026 · Enter your projects before 30 September 2026
Archello Awards 2026 · Enter your projects before 30 September 2026

Building extensions

An overview of projects, products and exclusive articles about building extensions

Project • By forresterarchitectsPrivate Houses

ADEN London

We are lucky to have had many clients that give us free rein to do something different on the typical London townhouse canvas. The most considered move here is also the most striking.  The existing rear extension, typical for a mid terraced townhouse in fashionable Stoke Newington is barely a decade old was retained rather than demolished only to be rebuilt. Working with what was within the existing walls allow for some creative remodelling to the new rear lounge.  The first floor to the rear outrigger was removed entirely-the loss of an office and bathroom. In its place, a new timber mezzanine now spans the rear of the building as a dynamic diagonal. Expressed as an exposed timber structure it provides new focal point with a ne... More

Project • By TAS ArchitectsPrivate Houses

Colt House Renovation, Suffolk

This full renovation and refurbishment of an existing Colt House in Suffolk includes new larch-clad single storey extensions to replace a previous extension and conservatory, a new staircase, new insulation, and replacement windows & doors.  Anthony Cullen Anthony Cullen Set in mature gardens and with woodland to the south, the house benefits from beautiful views but was in need of modernisation. Previously uninsulated walls have been upgraded with new insulation and new larch cladding, and UPVC windows have been replaced with new double glazed Velfac windows supplied by okoHaus. Internally, all finishes have been refurbished including restoration of the original parquet floor, and the previously dark stairwell has been... More

Project • By atelier TUOBars

Golden Omakase Extension

This project is an extension of the Japanese restaurant Golden Omakase in Shanghai, designed by atelier TUO. The extension was required to be completed within a short construction period, providing a small public space along the commercial street while adding a new entrance and private dining room for the restaurant. half.half.photography half.half.photography Located in a district that combines commercial vibrancy with historical character, the site is long and narrow—approximately 15 meters in length and 2.1 meters in width—preserving a required fire access lane. Pedestrian flow is concentrated along one side of the site. half.half.photography half.half.photography The design responds to two simultaneous... More

Project • By Hedya An ArchitectsPrivate Houses

Caulfield South Residence

Project Brief This alteration and addition reimagines an Art Deco semi-detached home in Caulfield South. The aim was to honour the charm of the original 1930s structure while introducing thoughtful spatial planning, contemporary materials, and a stronger connection to the garden, all within a compact footprint and modest budget. Crucially, the design sought to introduce character, make the home feel special, and uncover its magic despite budget constraints. Hedya An Architects What was once a two-bedroom, one-bathroom home lacking a dedicated dining area and backyard connection has been transformed to include three bedrooms, a main bathroom, ensuite, study, laundry, mudroom, and generous dining and living spaces. Upon entry, an immed... More

Project • By Quinn ArchitectsPrivate Houses

Harfield gardens

"We tasked Quinn Architects with the challenge of modernising a unique mid-century home to meet the living and environmental needs of the 21st century, without compromising the integrity of the house’s original spirit. The resulting evolution builds upon, but does not compromise, the original Case Study ethos around which it was originally designed back in the 70s — that of open plan, simple volumes and panoramic windows overlooking exterior courtyard spaces."Ruth, owner of Harfield Gardens House Elliot Sheppard Elliot Sheppard Elliot Sheppard More

Project • By Reservoir A - Architecture + UrbanismHospitals

La Madeleine Hospital

The extension project of the Madeleine Hospital Complex, designed by RESERVOIR A and DDV for the EpiCURA group, reorganizes circulation flows and proposes an efficient distribution of functions based on a critical historical analysis of the site's development. Marie-Noëlle Dailly Marie-Noëlle Dailly Marie-Noëlle Dailly Marie-Noëlle Dailly A series of small-scale additions that previously consumed a large portion of ground space have been demolished to make way for an entirely new volume. This new structure consists of two rectangular wings arranged in an "L" shape over three levels, plus a basement. The layout echoes that of the very first hospital that historically occupied the site in the 19th cent... More

Project • By Studio 163 ArchitectsPrivate Houses

Clay House

When Studio 163 were approached to transform this ground floor one bedroom flat in Kentish Town into a bright and modern two bedroom flat, it was a very dark and damp space which lacked flow and visual connection. Caption The bedroom and bathroom were both at the rear of the property with the kitchen and living room space at the front. This created the awkward result of having to walk through the bedroom to reach the garden. Caption It was very important to the architects that the new space reflect the character of the client and her way of living - to create a space for entertaining and socializing as well as a peaceful garden for this aspiring landscape designer. She was also very mindful about repurposing what she had and mak... More

Project • By Proctor & ShawPrivate Houses

Stepped Wall House

Stepped Wall House is a direct response to the unique site topography and geometry. The typical London ‘side extension’ typology had been adapted to the sloping and narrowing side passage site. The architectural solution was a mono pitched side roof which lands on a sequence of stepped walls which vary in height. In plan the steps create zones for dining, sitting and working. Nick Deardon Nick Deardon Nick Deardon Nick Deardon The new structure is simply expressed with exposed white washed timber beams and buff brick cavity wall. Internally a monolithic concrete floor and steps is paired with natural Clayworks plaster, Oak veneered joinery and green painted kitchen cabinetry with terrazzo worktops. Nick D... More

Project • By MICA ArchitectsHeritages

Lincoln’s Inn Hall

The Great Hall and Library project includes restoration, excavation and extension of the Honourable Society of Lincoln’s Inn, and is the most significant development to the historic estate in 150 years. The work comprises heritage-led conservation and restoration with bold contemporary additions to the oldest working Library in London. The changes enhance the character and setting of the Inn and its unique buildings, providing huge improvements to quality and quantity of teaching and event spaces for the wider Inn community. Andy Stagg Andy Stagg RestorationThe refurbishment of the Great Hall removes recent poor-quality alterations, restoring many of the building’s heritage features and reinstating the original ceremo... More

Project • By Objekt ArchitectenHousing

Villa ABC

For our clients in Lebbeke, we set to work on their existing home. The layout of the house needed to be rethought to improve its circulation. With 2 teenagers growing up, there was also the need for more space and a new, practical bathroom. Ypsilon Business Photography The main intervention became the demolition of the existing volume at the back of the house. Instead, a new volume was added, including a new rooftop dormer. This intervention increased the useful floor area on the ground floor as well as on the first floor. The entire rear façade is made up of glass sections for maximum connection with the garden. Ypsilon Business Photography A teardrop-shaped kitchen island was placed centrally in the kitchen, a place wher... More

Project • By Matthew Giles ArchitectsPrivate Houses

Northbourne Road

Matthew Giles Architects’ contemporary interpretation of proportion, form, and architectural detailing see the remarkable transformation of this 4 storey, villa-like home, first built in the 1860s.   The semi-detached suburban house lies within Clapham Park & Northbourne Road Conservation Area, and so the design team responded with an approach that was sympathetic and cohesive with much of the Victorian vernacular in the local area: yellow London stock brick, stucco mouldings around the doors, timber sash windows, and natural slate roofs.  © James Newton The remaking of this home included the demolition of an existing rear addition, replaced by a striking single storey infill extension that accommodates a ne... More

Project • By one-world design architectsPrivate Houses

Herondale Avenue

Tasked with designing and project managing the complete refurbishment and extension of a 5-bedroom family home, the stand-out element of the project was the visually-striking open plan kitchen-dining and entertainment space at the rear of the property. The focus was on blending the relationship between the garden and the interior, to reflect the homeowner’s outdoor lifestyle. Charlie Round-Turner Large glazed sliding doors were installed along the length of the back wall, a living wall established to blend inside and out, and extra light was brought into the space through the use of two half-barrel-vaulted sedum roofs. These vaults were extended beyond the sliding doors to frame the view of the garden and provide shade and shelt... More

Project • By WR-APHousing

25CR

25 Coleshill Road is a total reinvention of ‘the ugly duckling’ on the street into a sustainable, contemporary detached family home. The clients brief to us included the reconfiguration of all the internal spaces, a near rear/side extension to incorporate a family area and the addition of new modern dormers to the top floor to improve usability.   Ben Tynegate The existing dwelling had a very distinctive presence on the street as a standalone three-storey house painted in white, that differed from the surrounding Victorian traditional red-brick dwellings. The anomalies of the existing house presented an opportunity to design in partnership with the clients something that is both sensitive to the surrounding area whils... More

Project • By mia2 ArchitekturNurseries

Child care center Hauderweg

The Hauderweg child care facility is located near the center of Ebelsberg (southern district of Linz) and is embedded in a quality garden with beautiful old trees. It is well connected to the public transport network by tram. Access to the day care center and kindergarten is along the calm street Hauderweg. It is an ideal location for a childcare facility (also due to its proximity to the school). Kurt Hörbst Kurt Hörbst The existing building from the 1980s had to be renovated. Two outdated additions were removed to make room for a quality new building of the day care center, that has to be the space for 9 groups. This two- storey, compact, L-shaped building was positioned in the construction window in such a way, that... More

Project • By Studio Caminoli CoppolaPrivate Houses

Masseria Serra del Fico

The masseria is small in size compared to many others in Salento, even though in this area called “del Capo" they are generally smaller than those in the Brindisi area. The main volume was intact toward the east, while on the opposite side it was completely collapsed. The ancient volume was reconstructed with old recovered tuffs and each room was rebuilt by a local master (Mesciu Toto) with star-vaulted and barrel-vaulted ceilings. Caption All the parts interested by the expansion works were built with the same construction technique. In both cases a reinforced concrete structure was inserted within the masonries in order to improve the seismicity of the building. The masseria has a coat of arms dated 1769, but some parts of the... More