Concrete room cantilevers over a pool at Formwerkz Architects’ Extended House

A concrete room cantilevers over a swimming pool as part of this extension to a postwar property in Singapore by local office Formwerkz Architects.

Formwerkz Architects house extension features cantilevered concrete box

The clients asked Formwerkz Architects to extend a two-storey 1970s residence in Singapore’s Bukit Timah neighbourhood to give them a multigenerational family home, which is named the Extended House.

Formwerkz Architects house extension features cantilevered concrete box

The architects designed a new wing at the rear of the plot with a contemporary geometric profile and a exposed concrete exterior that contrasts with the black-rendered plaster finish of the older building.

Formwerkz Architects house extension features cantilevered concrete box

“From the beginning, we wanted to retain as much of the existing house [as possible], working around it and using it as part of the new narrative,” said studio co-founder Alan Tay. “It became a dichotomy of old and new, a story of a recent past and contemporary aspirations.”

Formwerkz Architects house extension features cantilevered concrete box

As well as the new wing, which contains a dining room, kitchen and bedrooms, the architects added a lap pool along one edge of the site and extended the ground floor of the existing building to create a new lounge area.

Formwerkz Architects house extension features cantilevered concrete box

This extension and a new balcony that projects from the facade of the black building are both finished in the board-formed concrete that creates a clear distinction between the old and new parts of the home.

Formwerkz Architects house extension features cantilevered concrete box

The cantilevered section contains the master bedroom and extends out towards the pool, shading the decking and the dining room windows below.

Formwerkz Architects house extension features cantilevered concrete box

An atrium built on the site of the original double-height dining room connects the two wings, while gaps on either side create courtyards sheltered by the long sections of the two main buildings.

Formwerkz Architects house extension features cantilevered concrete box

The courtyard next to the pool is raised above the level of the decking around it and is bounded by a low concrete retaining wall that provides additional seating space.

Formwerkz Architects house extension features cantilevered concrete box

A steel mesh bridge inside the atrium traverses the space between the old house and the extension, with concrete walls creating a sense of consistency with the external surfaces. The angled roofline of the original structure can be seen below the level of new windows installed when the atrium was constructed.

Photography is by Albert Lim.

Here’s some more information from Formwerkz Architects:


The Extended House

The house at the intersection of Linden Drive and Jalan Naga Sari in Singapore is built for a multi-generational family that entertains frequently. We retained the existing 2-storey post-war bungalow built in the seventies and added a new block at the rear and a lap pool along the side boundary. The new rear extension sits on higher ground than the pool with its upper volume cantilevering over the deck.

Ground floor plan of Formwerkz Architects house extension features cantilevered concrete box
Ground floor plan – click for larger image

From the beginning, we wanted to retained as much of the existing house, working around it and use it as part of the new narrative. It became a dichotomy of old and new, a story of a recent past and contemporary aspirations. The dialogue between the old and new formed the framework for the design. Formally, the new addition is articulated in board-formed concrete volumes in contrast to the existing house in black rendered rough plaster.

First floor plan of Formwerkz Architects house extension features cantilevered concrete box
First floor plan – click for larger image

The existing high ceiling dining hall is converted to a atrium that bridged the existing house with the new block at the rear. This is the heart of the project where it bridges both physically and spatially, the old house and the new extension.

Cross section of Formwerkz Architects house extension features cantilevered concrete box
Cross section – click for larger image

On the upper floor, a wire mesh steel bridge negotiates the level difference between the existing house and the new extension. The H-shaped massing encloses two intimate courtyard spaces that together with the atrium are spaces of greatest tension between the old and new. The elevated courtyard that fronts the pool has a low concrete retaining wall that encircle it to serves as both barrier and outdoor seating.

Long section of Formwerkz Architects house extension features cantilevered concrete box
Long section – click for larger image

Architect – Formwerkz Architects
Design Team – Alan Tay, Iskandar Idris, Ming Hui, Xue Zhen
C&S Engineer – Portwood & Assocates
Builder – Sinwah-Apac Construction
Site Area – 670 sqm
GFA – 450 sqm
Completed – 2013

Formwerkz Architects house extension features cantilevered concrete box
Diagram showing new and existing parts of the house

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Diamond House by Formwerkz Architects

The front facade of this faceted house in Singapore by Formwerkz Architects is interrupted by a shard of tinted glazing.

Diamond House by Formwerkz Architects

Formwerkz Architects were asked to create a family home that retained the owners’ privacy so the building’s public-facing sides are predominantly clad in wood but feature carefully placed apertures.

Diamond House by Formwerkz Architects

During the day the tinted glass reflects its surroundings, but at night a warm glow emanates from inside and permits glimpses of the interior.

Diamond House by Formwerkz Architects

The architects explain that the angular form was chosen to make the most of the small site and increase the space available for the garden: “The sloping walls at the corners allow for a smaller footprint while expanding the spatial volume at upper levels.”

Diamond House by Formwerkz Architects

A glazed entranceway dissects the building and separates the main living and dining spaces on either side.

Diamond House by Formwerkz Architects

At the rear, the house opens up as large windows and terraces look out onto a sunken garden and a lap pool surrounded by trees.

Diamond House by Formwerkz Architects

A twisting staircase connecting the three floors has an oak-clad handrail on one side to restrict views from the street, while glass is used for the side looking onto the interior.

Diamond House by Formwerkz Architects

Previous projects by Formwerkz Architects include a house with a courtyard shielded by a perforated concrete wall and another with an elevated garden that shelters two bedrooms underneath.

Diamond House by Formwerkz Architects

Other faceted homes we’ve published recently include a house in Italy with sections that jut out to fit its sloping site and a pair of tapered additions to a nineteenth century house in London.

Diamond House by Formwerkz Architects

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The architects sent us the following project description:


Diamond House

The house along Cove Drive in Sentosa sits on a slightly tapered site that faced a man-made lake. Built for a small family that greatly cherish their privacy, the house turns it back on the street and the sides where the neighbours are in close proximity.

Diamond House by Formwerkz Architects

Like a monolith resting over the gardens, the single, faceted volume house the main spaces with their primary view to the waterway.

Diamond House by Formwerkz Architects

The main entrance brings one into the centre of the house with the living and dining space on the sides.

Diamond House by Formwerkz Architects

The upper floors are split in the middle into two volumes that house the daughter and the parent’s bedrooms.

Diamond House by Formwerkz Architects
Basement plan – click for larger image

The basement accommodate the guest room, entertainment, services and garage, lit and ventilated largely by the sunken courtyards.

Diamond House by Formwerkz Architects
Ground floor plan – click for larger image

The massing on grade is kept deliberately small to create more garden spaces within the tight site.

Diamond House by Formwerkz Architects
First floor plan – click for larger image

The geometry is derived from negotiating with the planning parameters imposed on the neighbourhood and the desire to simplify the building form.

Diamond House by Formwerkz Architects
Attic plan – click for larger image

The front and side facades are pared down with openings strategically position to allow optimal daylighting with minimum compromise in privacy.

Diamond House by Formwerkz Architects
Section – click for larger image

The sloping walls at the corners allow for a smaller footprint while expanding the spatial volume at upper levels.

Diamond House by Formwerkz Architects
Front elevation – click for larger image

Like its simple form, few architectural materials were used. The facades are entirely wrapped in iron wood. The interior adopts a lighter palette of oak and travertine.

Diamond House by Formwerkz Architects
Side elevation – click for larger image

At nightfall, fragments of the internal spaces are seen on the facade.

Diamond House by Formwerkz Architects
Rear elevation – click for larger image

The muted, impenetrable volume gradually gives way to the volumes of internal light, revealing the intricacy within.

Diamond House by Formwerkz Architects
Rear elevation – click for larger image

Site Area – 6000 Sqft
Gross Floor Area – 5000 sqft
Completion – Jan 2012

Architect – Formwerkz Architects
Team – Alan Tay , Foo Yuet Yee, Cai Xun
Structure – Portwood & Associates
M&E – PCA
Builder – Sinwah-Apac Construction Pte Ltd

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Courtyard House by Formwerkz Architects

A perforated concrete wall screens the courtyard of this Singapore house by Formwerkz Architects from low sun and prying neighbours (+ slideshow).

Courtyard House by Formwerkz Architects

Formwerkz Architects punctured the concrete wall joining the house’s two blocks with a pattern of holes that looks like inverted braille.

Courtyard House by Formwerkz Architects

“The perforated concrete wall allows for air-flow and glimpses of the garden beyond but shields the western sun and its adjacent neighbours,” said the architects.

Courtyard House by Formwerkz Architects

The blocks sit either side of a pool in a central courtyard and have gardens to the front and rear, a layout modelled on a northern Chinese typology but adapted for the tropical climate.

Courtyard House by Formwerkz Architects

“Similar to the traditional courtyard typology, the inner core is a private, secure and well-ventilated outdoor space intended as an extension of the family space,” the architects said.

Courtyard House by Formwerkz Architects

From street level the house is approached via a flight of stairs that lead up to a decked terrace, which sits on top of a garage next to the staff quarters in the basement.

Courtyard House by Formwerkz Architects

The ground floor is tiled with travertine both outside and in, divided by the central pool that separates a living area on one side and a dining room and kitchen on the other.

Courtyard House by Formwerkz Architects

Upper storeys overhang these spaces, protecting them from rain to remove the need for walls that would face the interior.

Courtyard House by Formwerkz Architects

A spiral staircase leads up to a series of bedrooms, studies and bathrooms on both sides, connected by a balcony that circles the courtyard partly indoors and partly out. This walkway breaches the concrete walls so the residents can amble above the jungle-like garden.

Courtyard House by Formwerkz Architects

Rooms on the first floor are screened with wooden strips, used either vertically or criss-crossed. A large bathroom, library and outdoor seating area take up the top floor.

Formwerkz Architects has also designed a house with bedrooms sheltered under a long canopy and a couple of the studio’s projects have been shortlisted for World Building of the Year 2013.

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The architects sent us the following information:


The Courtyard House

The courtyard house is located in a three-storey mixed-landed residential district, on the eastern part of Singapore. Built for a multi-generational family who seeks a communal way of living but wanted a space that are private, screened from the prying eyes of surrounding neighbours.

Courtyard House by Formwerkz Architects
Ground floor plan – click for larger image and key

While inspired by the Si He Yuan courtyard house, the project seeks to readapt the vernacular typology found in the northern regions of China, to a detached house typology in an urbanised tropical context.

Courtyard House by Formwerkz Architects
First floor plan – click for larger image and key

The massing, comprising of two blocks in a north-south orientation, delineate the site with a front garden, the central courtyard where all the rooms looked into and a back garden. The public and private realms are layered in a spatial procession from the street. Circulation within the house circumambulate the courtyard on all floors.

Courtyard House by Formwerkz Architects
Second floor plan – click for larger image

The main spaces are organised around this central, outdoor atrium where a lap pool runs parallel to one edge. The ground floor is finished entirely in hone travertine without any drops to blur the boundaries between indoor and outdoor, unifying the entire ground floor as a singular, seamless, communal space. The perforated concrete wall allows for air-flow and glimpses of the garden beyond but shields the western sun and its adjacent neighbours.

Courtyard House by Formwerkz Architects
Cross section – click for larger image

The house expresses the relationship between periphery and core. Similar to the traditional courtyard typology, the inner core is a private, secure and well-ventilated outdoor space intended as an extension of the family space. While the periphery is surrounded in dense tropical foliage, the courtyard is tranquil and contemplative.

Courtyard House by Formwerkz Architects
Long section – click for larger image

Through a series of spatial appendixes of bridges, wall perforations, pool extensions, shower stalls, stairs and bay windows that penetrate the two side walls that bound the inner sanctum, the residents gets to experience the tropical garden on the periphery.

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The Park House by Formwerkz Architects

The Park House by Formwerkz Architects

The elevated garden of this Singapore house by architects Formwerkz creates a huge canopy to shelter bedrooms beneath.

The Park House by Formwerkz Architects

Creating a figure of eight at first-floor level, the garden wraps around and divides a double-height living room from a kitchen and dining area with a study above.

The Park House by Formwerkz Architects

A black scissor staircase climbs up through the canopy to provide exterior access to these first-floor rooms, while a white spiral staircase leads up from the raised garden to the attic study.

The Park House by Formwerkz Architects

Large areas of glazing let natural daylight into the house, which filters in through thin vertical louvers.

The Park House by Formwerkz Architects

If you’re interested in projects from Singapore you can check out a few more here.

The Park House by Formwerkz Architects

Photography is by Jeremy San.

The Park House by Formwerkz Architects

The text below was provided by Formwerkz Architects:


The Park House

Sited in the northeastern corner of the Singapore, the 2-1/2 storey house sits on a sunken piece of land facing a huge park next to the sea.

The Park House by Formwerkz Architects

It is a house designed for a middle-age couple that entertains frequently.

The Park House by Formwerkz Architects

The house is set low to the ground and all the bedrooms are placed on grade while the living spaces on the upper floors.

The Park House by Formwerkz Architects

The bedrooms on the lower floors gets the shade and privacy from the garden and the boundary walls while the communal space on top, connects with the park across the street.

The Park House by Formwerkz Architects

Click above for larger image

Capitalizing on the planning guidelines on Roof Eaves Setbacks, created a 2m wide apron all round the upper floor that stretches to form the car porch canopy.

The Park House by Formwerkz Architects

Click above for larger image

The band of cantilevered concrete is planted on top, elevating the garden to the upper floor while shading the bedrooms on the ground.

The Park House by Formwerkz Architects

Click above for larger image

Site area – 415 sqm
Built-up area – 250 sqm

The Park House by Formwerkz Architects

Click above for larger image

Architect – Formwerkz Architects
Design Team – Gwen Tan, Berlin Lee, Stephen Lim, RuiLin

The Park House by Formwerkz Architects

Click above for larger image

Structural – TEP Consultants Pte Ltd
Builder – PLC (2006) Pte Ltd