Premium building & construction for homes that deserve the best. Trusted by Mosman, Double Bay & Eastern Suburbs homeowners.
We don't cut corners.
We build them properly.
BuiltByAJ is a Sydney-based building and carpentry business built on one principle — do the job right. Every time. No shortcuts, no hidden costs, no excuses. Just quality workmanship from start to finish.
From a single door replacement to a full custom build — every job gets the same standard of care.
Get a Free QuoteCustom timber work, fix-outs, repairs and precision carpentry for residential and light commercial.
Internal and external doors, solid core, hardware and clean finishes that last.
Wall framing, structural alterations and support work done with proper planning.
Decking, outdoor platforms, privacy screens and timber structures built for durability.
Custom outdoor cover solutions including steel awnings, pergolas and shade structures.
Full renovations and custom builds managed from planning through to completion.
Ready to get started?
"The best in the business. Carpentry to perfection and detail. Some call him OCD — it's what we need. Well done."
"What an amazing job Alexander did for my home. We had recently purchased a sauna that Alexander installed very neatly in our backyard and I am more than happy with the final result. Beautiful work Alex!"
"Great work from Alex! Our friend Jean-Paul recommended Alexander to refit & install doors at our new place and they came out perfect! Highly recommend."
"Alexander consistently delivers high quality carpentry with great attention to detail. Reliable, professional, and easy to work with. Highly recommend!"
"Highly recommend BuiltByAJ. Fantastic bloke and very respectful. His attention to detail is unreal and he puts his customers first every time."
"Top work skills. Knows how to deal with customers, treats people with respect and most importantly delivers quality work. Highly recommend — jobs will be quality and fast."
"Great experience from start to finish. He was professional, reliable, and paid close attention to detail."
"Would highly recommend AJ to anyone. An extremely skilled carpenter who always does a fantastic job and works very hard."
"Reliable, everything explained clearly. Highly recommended — a pleasure working together."
"I engaged BuiltByAJ to do some repairs around the house and I couldn't be happier. Alex was professional and on time."
Call or submit a quote request. We'll discuss your project, answer your questions and give you an honest overview — no obligation.
We come to site, assess the job, and give you a clear written quote. No surprises. No hidden costs.
We deliver. On time. Site left clean. Finished to the standard BuiltByAJ is known for.
Based in Bexley, serving homes that demand the best across Sydney's most sought-after areas.
Not sure if we cover your area? Call us.
Fill in the form and we'll call you back to discuss. Or call us direct — we pick up.
We'll be in touch shortly to discuss your project.