BAAhouse offers a modern living solution, architecturally designed to optimise the space in your backyard.

BAAhouse was set up by Architects and Professional Designers who developed a passion for producing architecturally designed second dwellings when approached by a friend over 6 years ago who requested a granny flat that blended in with the natural surroundings. 

With such an interest in the 1st design from the general public at the Brisbane Home Show in 2012, we identified a gap in the market place for affordable housing alternatives that were aesthetically pleasing and blended in with existing dwellings and the environment. We decided to set up BAAhouse as a company.

Since then we have developed a range of stylish and contemporary granny flat / small house designs to suit most budgets and built with quality materials. We offer a quality and individualised product as well as a professional and personal service.

BAAhouse is a division of BAAhouse + BAAstudio. Baahouse provides a range of pre-designed small houses while BAAstudio is the more traditional customised design architectural service providing high end architectural designs to suit your lifestyle needs.

Our team of designer's create internal and external spaces that provide a sustainable, enjoyable environment. We are specialists in integrating the three parts of your living environment: building architecture, interiors and landscape- equalling a design enhancing life.


  • Aesthetic and multi-purpose modern designs for your granny flat, home office, studio or rural retreat. Developed by architects with over 20 years of experience in the industry.
  • Designed and coordinated to capture solar access and prevailing breezes- warm in winter, cool in summer.
  • Fits on a standard 600sqm lot without council approval (1 & 2 bedroom dwellings only).
  • Produce quality detailed construction drawings ensuring leading Brisbane based builders deliver a cost effective and quality finish build.
  • Work with local Certifiers, Engineers and Estimators to take the stress out of building and give you an accurate guide on costings.
  • Soaring raked ceilings to living and deck areas to maximise space, light and comfort.
  • Sustainably sourced timber construction and battening adding texture and warmth.
  • Eco-material and finish options to suit your lifestyle and budget.
  • Capital investment for your property
  • Option to buy the plans and source your own builder. Ideal if located outside South East QLD.
  • Project manage the job with regular site inspections to ensure the job is built as per the drawings and documents produced. We act as an agent on behalf of the client.

Why BAAHOUSE as a name?



Being raised and having studied in N.Z where sheep are a large part of the landscape, BAA seemed an appropriate and catchy name!

All of the BAAHOUSES have been named after famous sheep from the Merino to the Drysdale. This keeps our designs consistent with the companies name BAA.

The BAAHOUSE journey from conceptual sketch design to the final 3d vision. 





BArch, Bbsc, VUWNZ, 2000

BAAHOUSE director CLAUS EJLERTSEN is a international designer from Denmark and New Zealand.

With over 20 years experience having worked in London, New Zealand and Australia. He completed a Bachelor of Architecture and Bachelor of Building Science from the University of Victoria, Wellington, New Zealand.

Throughout his career CLAUS EJLERTSEN has developed his unique and distinctive style through technical drawings /national and international experience and has a passion for detailing and producing high standard quality architecture.                                                                                                                                                       

With his enthusiastic and fresh approach to all architectural projects, Claus Ejlertsen has won many design awards and has worked as a principle design Architect for many leading architect firms. Claus is passionate about producing aesthetic architecture and designing to express individual clients personalities, as well as understanding the site to maximise the clients lifestyle in terms of views, light, space and natural surroundings.




Senior Architect

Board of Architects member: 4996

Graduating from The University of Queensland in 2011, Jessica is a registered architect with over seven years’ experience working predominately on multi-residential projects, including apartment and townhouse developments in inner city Brisbane. She understands and can confidently guide her clients through the complete design process from sketch design through to construction. Jessica understands the value of developing good relationships with her clients to better understand their vision.

Jessica believes that the most important phase of a project is at the drawing board, and recommends that every project regardless of scale or budget, will benefit from architectural design




Dio. Int Design Interior Designer.

Dean’s approach to design is holistic, blending environmental, physical and aesthetic qualities of architecture. With a passion for residential design, Dean delivers a creative, considered approach to design quality and client management.

A qualified interior designer with a commitment to impactful and intelligent design, Dean has a discerning eye for joinery detailing and prides himself on substantiating the brief with distinctive results. From traditional to contemporary aesthetics, each design is tailored to be unique.

Presently a student of Architecture at Queensland University of Technology, Dean supports the Architectural team through collaboration and high attention to architectural documentation to service a range of project sizes.

In today's economic climate with the cost of construction and renovation prices skyrocketing, -why not invest in an affordable low cost 2nd dwelling on your existing house lot.


BAAHOUSE can help you achieve this. We offer verbal onsite advice regarding your extension, discussing alternative layouts and optional extras.


With over 20 years combined experience in the building industry as Professional designers and Architects, BAAhouse can give a truly professional service and quality building outcomes.


Every house is designed to fit on a typical sized block and situated on the site so they do not require council approval. The BAAhouse range is based on 50-120 square metres, one to two bedrooms, laundry, study, kitchen and dining with additional decks and optional extras. New 3 bedroom option available.


All designs are approved by an Engineer and then certified by local Certifiers. After certification, BAAhouse works in conjunction with established builders to give you a truly unique and high quality finish design that will enhance your life style and give you an investment for the future.