There were no female architects when the house on the grounds of the Holy Trinity Anglican Church was designed by Mrs Milton Capp, who had no training in architecture.

And yet the wealthy 61-year-old drew the plans based on her knowledge of how a home should be laid out.

Fast forward through 100 years, the advent of electricity in 1936 and some extensive renovations and the parish will celebrate the centenary of the home of historic ecclesiastic value with a free community fair this Saturday.

The house was built as a rectory after the former home, built in 1857, was deemed to be in too poor condition. Bricks from the former building were actually used to create Trinity House.

The home was used as a rectory up until 1960 and since then has undergone renovations, the latest of which were completed just a few weeks ago.

"They've taken a couple of years," Anglican Church of Branxton Greta Lochinvar Priest in Charge Reverend Nicole Baldwin said.

"The corner of the house had dropped into reactive clay. There was some structural stuff as well and we put in a new kitchen.

"From when I first walked in here nine months ago, it's hard to believe it's the same building."

Rev Baldwin said the house will be used for after service morning tea and other church events.

"We've been having morning tea in the church, which is nice, but it will be great to be able to have it in the house," she said.

Rev Baldwin said the community fair was a celebration of the history and work that had been put in, but also a chance to invite the wider community into the space.

"It's not our property," she said. "We're the caretakers, we're looking after it for the community.

"We want to open it up for community use.

"We want people to feel like they can be a part of the space."

The community fair will include market stalls, face painting, Devonshire Tea prepared by the Paterson Country Women's Association and a barbecue.

The entertainment will be provided by the New Empire Ragtime & Dance Band, who will perform 1920 jazz music on the verandah of the house, to fit in with the home being built in 1919.

There will also be displays inside Trinity House showing clothes from the Australian Clothing and Textile Museum as well as furnishings from that era.

The event runs 11am-3pm. Vehicle entry is from Cantwell Road.