Ordinary People, Extraordinary History

If you ever stopped to look at a building whose architectural features or sense of history held your interest, ACO might just be what you are looking for.

Most people who join ACO are not architects, they are citizens who want to know more about our built heritage and how we can work together to save the best of it.

For over eighty years, ACO has been working to find viable uses for Ontario’s historical assets ensuring that the distinctive buildings of our past do not become parking lots or building sites for characterless new development.

You can support our ongoing advocacy by making a donation, by purchasing a historical house sign, or by becoming a member.


Hang Out a Shingle


Own a heritage home and want to show your pride? Our Historical House Sign package includes a sign featuring the name of the original owner and their occupation as well as the year of construction, and a print monograph including history of the home and its owners that is uncovered by our research team.

It's a great glimpse into your neighbourhood's history and the cost is only $75* per municipal address. It makes a great housewarming gift!

*ACO members receive a 10% discount


Join ACO London

Joining ACO London is a great way to meet all sorts of people who want to help preserve the architectural heritage in our region, people who value our built heritage, who want to conserve those features that make London a distinctive city, who believe that heritage is one key way a community maintains its identity and who believe that adaptive re-use is a green option.

Joining ACO through the London Region branch puts you in touch not only with London events but with activities across the province. As a member of ACO London you will receive its tri-annual newsletter, the ACORN, and the London Region newsletter, The Advocate.

With the public attention recently on several significant heritage buildings, threatened to be destroyed, it is vital that ACO be strong enough to present a defence of our built heritage. Your financial support will help us achieve this.

You can join online now by clicking the button below or you can download a membership form and delivering it to our office at Grosvenor Lodge.

If you have any questions or concerns please feel free to reach out to our membership coordinator Sharon Lunau.