Contractor

Name : Mr. and Mrs. Kapila Bandara - The Client

Contact : kapila.chello[a]gmail.com

Construction Manager

Name : Archt. Dr. Narein Perera - The Architect

Contact : nareinperera[a]gmail.com

 https://uom.lk/staff/Perera.NGR.php

Stakeholders

Function : Designer

Archt. Dr. Narein Perera

nareinperera[a]gmail.com

 https://uom.lk/staff/Perera.NGR.php


Principle Architect

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Function : Structures calculist

Eng. Keerthi Ratnayake

keerthi[a]clefcon.com

 http://www.clefcon.com


Structural Design

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Function : Construction company

Saman Gamage

samanbgamage[a]gmail.com

General Contractor

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Function : Manufacturer

Archt. Shashikala Ranasinghe / Electroplastic Engineering Co.(PVT) LTD

shashi125[a]yahoo.com

Lighting Consultant, Luminaire Design and Manufacture

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Function : Manufacturer

Mark Your Design | MYD - Shenuka Dias

dias.myd[a]gmail.com

Furniture Design and Manufacture

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Function : Other consultancy agency

CQS Sunanda Gnanasiri

ccccqs[a]gmail.com

Cost Consultant / Quantity Surveyor

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Function : Other consultancy agency

Eng. Kelum Perera and Eng. Rifai Mohamed

kak.perera[a]gmail.com, rifaas[a]gmail.com

M&E Engineering Consultants

Contracting method

General Contractor

Type of market

Realization

If you had to do it again?

A significant aspect of the building process was the time taken for construction. The extended time for the construction was due to the responsible and sustainable procurement of materials, and the human capital heavy building process. Yet, this is taken as a positive element in the overall scheme. This has allowed all concerned to make informed decisions and explore the labour intensive, hand-crafted approach to the creation of elements to the maximum.

Building users opinion

The well-defined functional zones, the careful detailing of each zone in continuous consultation with the User, has resulted in the Users being extremely happy with the product. The home has been in occupation for over a year - a year that has compelled extensive use of our homes because of the COVID19 pandemic – yet, the Bandaras remain content.

A conscious decision was taken to avoid air conditioning in occupied spaces. Even with the extended occupation of the spaces during this year, the thermal comfort, in particular, is deemed satisfactory. Thus, in post occupancy evaluation it was decided to maintain all spaces as free running.

The illumination levels were kept comparatively low, to imbue spaces with a quality that encourages people to stay. This aspect is highly appreciated, and the comfort and peace of the places created, is appreciated by the Users.

Mr. & Mrs. Bandara eagerly await the day they can share their home with their friends and relations, freely and safely – without concerns of COVID19.

Energy consumption

• Primary energy need : 1,45 kWhpe/m².year
• Primary energy need for standard building : 15,00 kWhpe/m².year

Calculation method : Other

Envelope performance

• Envelope U-Value : 1,41 W.m^-2.K^-1
More information :

The envelope is dominated by the terracotta tile skin. The roof and wall elements differ in their level of insulation and internal layer :
The roof element includes a timber ceiling together with 50mm of insulation sandwiched between reflective layers.
The wall elements act as screens, thus includes only the timber structure and tiles.
The lower level of the residence uses random rubble walls. u-value = 4.38.

• Building Compactness Coefficient : 0,24

Systems

Heating system :
• No heating system
Hot water system :
• Solar Thermal
Cooling system :
• No cooling system
Ventilation system :
• Natural ventilation
Renewable systems :
• Solar photovoltaic
• Renewable energy production : 88,70 %
Other information on HVAC :

No HVAC installed. Designed and run as a free running building. The spaces utilise ceiling mounted fans.

The system uses Net-metering for the solar system. Thus, there is no credit granted for excess energy produced.

Solutions enhancing nature free gains :

The concept of the project is built around reducing solar heat gain, while maximising ventilation and optimising daylight integration. The building envelop is unique and developed for this purpose.

Urban environment

The site is a short distance from the main road, although it does not have views towards it. Therefore, it is sufficiently secluded, giving opportunities for opening of spaces, natural light and ventilation, without concern for vehicle emissions and particulate matter. 

The placement of the new residence corresponded to where an existing residence was sited. The old residence was demolished, because it was in no condition for renovation. Therefore, minimal new ground area was consumed. This allowed the preservation of all existing trees on site and the conscious orientation and amalgamation of the landscape into the design. 

The internal access path from the entrance to the property to the house is also one that originally existed. In its final detailing the path was paved with perforated blocks that allow grass to grow along the path, while vehicle access and surface water run-off is effectively facilitated for. 

The indoor play area / badminton court, was a half built structure at the commencement of design process. Therefore, the siting and elevation was utilised as is. The structure was on an adjacent property, later amalgamated as a part of the whole. 

The microclimate of the immediate context was exploited to the maximum. The shaded and vegetated context was preserved and this allowed the optimum integration of natural light and ventilation. Thereby, together with the renewable energy installation, created a Net-Zero energy building.  

• Land plot area : 4 222,00 m²
• Built-up area : 15,00 %
• Green space : 3 572,00

Product

Luminaires

Electroplastic Engineering Co.(PVT) LTD

[email protected]

Product category : HVAC, électricité / lighting

Custom Designed Luminaires. Archt. Dr. Narein Perera and Archt. Shashikala Ranasinghe - Designers

The Clients - the users of the residence - appreciate the idea of asymmetry and the soft, diffused quality of the light emanated by the luminaires. Fabric as the primary material for the ambient light luminaires works to soften the overall interior and its distinct materiality. The options for task lighting are specifically reduced in scale compared to that of the ambient fixtures. Thus less visible in general areas. All fixtures use LED lamps.

Construction and exploitation costs

• Reference global cost : 580 000,00 €
• Renewable energy systems cost : 5 700,00 €

Reference global cost/Dwelling : 580000

• Total cost of the building : 505 000 €
Additional information on costs :

The total cost indicated here includes two distinct functional zones - the residence and the extended recreation / entertainment zone. The total cost also includes the complete furnishing of the spaces. All aspects were designed and custom manufactured for the project.
A distinct advantage was seen in the use and sourcing of materials from the locality, greatly reducing transport costs. Almost all of the major elements of the build was built in-situ, therefore waste was minimised to a maximum. [e.g. timber was sourced as logs from the local (State Timber Corporation), sized such that almost the whole log is utilised, as joists, rafters, timber battens etc.]

Energy bill

• Forecasted energy bill/year : 130,00 €

Real energy cost/m2 : 0.14

Real energy cost/Dwelling : 130

Indoor Air quality

As a naturally ventilated building the posiibility of CO2 concentration is minimised. Even when fully enclosed the vertical volumes of the spaces help ease any buildup of CO2. 

All materials used in the interiors is natural and coatings used are all water based. 

Comfort

Health & comfort :

Health and Comfort is deemed a primary concern in the siting, orientation and form making of the building in general and the building envelop in particular. 

The shaded envelop ensures the direct solar heat gain into the interior spaces are minimised. The envelop itself is again shaded by vegetation adjacent to the building and vegetation on the envelop itself. 

The verandah spaces outside each internal space and extensive natural ground cover around the building enhance evaporative cooling possibilities. 

All fenestration is oriented to the north and south, while ensuring the glazed surfaces are shaded, by both building elements and vegetation.

The lighting of the spaces mimic and incorporate the natural rhythms of the day. Screens of timber and bamboo tat allow the user to control the intensity of light penetrating the spaces. Direct sunlight is avoided by the orientation of the fenestration, but use large opening to capture and integrate daylight, throughout the day.

 

GHG emissions

• Building lifetime : 80,00 year(s)