Mulpha prepares Marymount Estate, a rare low-density Castle Hill land release

Mulpha is preparing to launch Marymount Estate in Castle Hill, bringing a rare new land offering to one of Sydney’s most tightly held residential markets.

The estate will introduce generous homesites within a low-density masterplan, with privacy, space and the established character of its Castle Hill setting central to the new community.

It will mark the first time in more than 65 years that the Marymount land has been made available, positioning the estate as a once-in-a-generation release in a suburb where opportunities to secure new residential land are increasingly limited.

About Marymount Estate

Rather than pursuing a higher-density outcome, Marymount Estate has been planned around larger individual lots and a more considered approach to the number of homes across the site.

The result is intended to provide greater separation between residences and more flexibility for future homeowners when designing their homes, while retaining a stronger connection to the surrounding natural environment.

The emphasis on lot size is particularly notable given Marymount's Castle Hill location, where established housing dominates and substantial new homesites are rarely brought to market.

Mulpha is positioning the estate around the idea of "where rarity becomes legacy", reflecting both the long-held nature of the site and the opportunity for purchasers to create individual homes rather than choose from a predetermined built form.

The project will also extend Mulpha's longstanding presence in Sydney's north-west.

The developer has operated for more than three decades, with its portfolio spanning residential communities and major hospitality assets. Its projects include Norwest Quarter, while its broader Australian portfolio includes InterContinental Sydney and InterContinental Hayman Island Resort.

Norwest Quarter has been one of Mulpha's most significant recent projects in the area, introducing a mixed-use, sustainability-led precinct to nearby Norwest.

Marymount Estate represents a different residential proposition, centred on land, lower density and the ability for each homesite to accommodate an individually designed residence.

Mulpha says its experience across landmark communities and destinations will underpin the planning and delivery of Marymount, with the developer framing the project around long-term neighbourhood quality rather than simply the release of new lots.

Castle Hill itself is one of the Hills District's most established suburbs, combining extensive retail, education and recreation infrastructure with Sydney Metro connectivity.

Builders in the Hills District region

A number of established builders are active across the broader Hills District and North West Sydney region, offering buyers in the area a range of design and delivery approaches once land becomes available to build on.

Burbank Homes

Burbank has been building homes across Australia since 1983, growing from its Melbourne origins into a national builder with an active presence across Victoria, Queensland, New South Wales, the ACT, and South Australia.

The company remains family-owned and operated, and is backed by the wider Burbank Group, which spans land development, design, construction, finance, and trade services.

Burbank's offering centres on a broad range of single and double storey home designs, supported by a large network of display homes and a design studio for personalising finishes.

Hudson Homes

Hudson Homes builds across Sydney, the Central Coast, the Hunter region, and Brisbane and the Gold Coast, with North-West Sydney listed among its serviced regions.

The builder is 100 per cent Australian owned and has built its reputation around a Fixed Price Build Contract and a Time Frame Guarantee, under which it commits to paying customers for each day a build runs over its agreed schedule.

Hudson also offers a 12-month Defect Liability Period, longer than the industry-standard three months, alongside a customer portal for tracking build progress.

McDonald Jones Homes

McDonald Jones Homes has been designing and building homes since 1987 and maintains an active presence across Sydney, along with the Hunter, Central Coast, Mid North Coast, South Coast, Southern Highlands, and Canberra regions.

The builder is known for its steel-framed construction, backed by a 50-year structural warranty on its TRUECORE steel frames, and offers a MyChoice Design Studio for personalising interior and exterior selections, along with in-house home loan and conveyancing support through its MyChoice services.

Domaine Homes

Domaine Homes is headquartered in Baulkham Hills, placing it within the Hills District itself.

The builder, trading under Domaine Homes By Clarendon, has built its offering around transparent, fixed pricing, including an online tool that lets buyers design and price a home before visiting a display centre. Its standard build process runs through six construction stages, with an average build time of around 36 weeks for a single storey home and 40 weeks for a double storey home.

Bottom line

For Marymount Estate, its established setting is an important part of the project's point of difference. The community will add a limited new land offering without the scale or density more commonly associated with newly developed residential precincts across Sydney.

For buyers who have spent years watching Castle Hill's established housing stock trade hands without a genuine opportunity to build from scratch, a rare land release changes the calculus entirely, offering a foothold in a location whose infrastructure, schools, and transport links are already mature rather than promised.

Marymount Estate is coming soon, with registrations of interest now open ahead of further details on the homesites and release program.