Welcome to Alter Extend Design

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Alter Extend Design

About us

Alter Extend Design is an architectural drafting service run by a highly experienced practitioner based out of Caulfield in Melbourne’s inner south-east. The company has been involved in providing drafting and architectural design services for over 20 years. Alter Extend Design specialises in preparing documentation for small and large town planning and building permit projects. The projects consist of large and small residential and town planning projects as well as documenting industrial and commercial projects.

Our services


Preparing documentation for town building.

3D modelling

Developing a mathematical representation of houses.


Building permits for residential and multi-units developments.


Planning wide range outdoor living extensions such as fences, verandahs and car ports

What else do we provide?

Site visits

First site visit is free to inspect the property and discuss the project.

Professional design

Plans externally drafted using 3D Modelling CAD on request.

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Our Experience

Alter Extend Design

Architectural design company based in Caulfield for the last 20 years having established great relationships with Glen Eira and surrounding councils. Qualified in Architecture and Building Surveying along with 30 years of experience in the industry. Mainly operating in Melbourne’s south eastern suburbs and have built up a strong rapport with council and property developers within the area.

What our clients say

"Alter Extend Design were thorough, punctual, fast, reliable, helpful and provided good ideas. I am very happy with the service they provided and with the workmanship."


"Alter Extend Design did the preliminary drawing satisfactory. The drafting was submitted on time. Les was professional and he came on time."

Lana M

"I would most certainly recommend this business, Less is very professional, he knows what he is doing and is very eager to help."

Ester P

"Les Klajn from Alter Extend Design was a pleasure to deal with. He was diligent in dealing with council and was able to obtain good outcomes with minimal fuss."

Chris & Marina Scott