Many homeowners are surprised to discover how complex the Council approval process can become when heritage controls apply. Poorly considered designs, inadequate heritage responses and a lack of local experience can lead to expensive redesigns, lengthy delays, or refused applications.

At McCullum Ashby Architects, we specialise in heritage alterations and additions throughout Ku-ring-gai and Sydney’s Upper North Shore. As a local architectural practice with extensive experience in heritage-listed homes and HCAs, we understand how to balance contemporary family living with the architectural character that makes these homes so valuable.

Some of the most common mistakes we see include:
■ Additions that overwhelm the original dwelling
■ Designs that fail to respond to the existing streetscape
■ Unsympathetic materials and detailing
■ Poorly resolved roof forms and rear additions
■ Heritage reports and DA submissions that do not adequately address Council requirements

These issues can significantly impact approval timeframes and project costs.

Our experience working with Ku-ring-gai Council and heritage-sensitive sites allows us to develop carefully considered architectural solutions that respect the original home while creating functional, modern living environments.

We have completed a wide range of successful heritage renovations, alterations and additions across Ku-ring-gai, including homes in Wahroonga, Warrawee, Turramurra, Pymble, Gordon, Killara, Lindfield and Roseville.

View examples of our recent alterations and additions projects here.

Contact McCullum Ashby Architects to discuss your project and learn how we can help you navigate the heritage approval process with confidence while creating a home that respects its history and supports modern family living.

The post Heritage Alterations & Additions in Ku-ring-gai: Avoiding Common Council Approval Pitfalls appeared first on Mccullum Ashby Architects | Wahroonga Architect.

This project, now featured on our website, represents a carefully considered transformation of an existing home within the Clanville Conservation Area in Roseville. The design focuses on enhancing liveability through improved spatial planning, increased natural light, new swimming pool and a stronger connection between indoor and outdoor living areas, delivering a contemporary family home while respecting the character of its surroundings.

The approval was ultimately secured through an appeal to the Land and Environment Court (LEC). While our preference is always to achieve approvals through the standard DA process, this project required escalation to ensure the client could realise their vision. Importantly, the appeal outcome substantially retained the integrity of the original design, reinforcing the strength of the architectural approach and planning strategy.

This result highlights our ability to navigate complex planning challenges and advocate effectively for our clients when required, balancing design quality with regulatory frameworks to achieve the best possible outcome.

If you are planning alterations and additions in Roseville or the wider North Shore, and are seeking an experienced local architect to guide your project – from concept through to approval – we would welcome the opportunity to assist.

Project location: Roseville, NSW

Stage: DA approval

Planning context: HCA | Ku-ring-gai Council LEP & DCP

The post DA Approval of our Lord Street, Roseville Project appeared first on Mccullum Ashby Architects | Wahroonga Architect.

With the introduction of Chapter 6 – Low and Mid-Rise Housing under the State Environmental Planning Policy (Housing) 2021, new opportunities are emerging for well-considered infill development across NSW.

At McCullum Ashby Architects, we’re already helping clients capitalise on these changes.

A Recent Success Story

We recently secured approval for four Class 1A townhouses on an exceptionally challenging site under the LMR provisions.

The constraints were significant:

• Steep topography with a 9m fall from rear to street
• Narrow site proportions (65m x 15m)
• Strict requirements for forward vehicle entry and exit
• Overshadowing impacts from surrounding development
• Sensitive southern neighbour interfaces

Despite this, the design needed to remain within Class 1A classification—avoiding the cost and complexity of Class 2 construction—while still delivering high-quality, marketable dwellings.

Smart Design = Better Outcomes

Through careful planning and design, we achieved:

• Four individually compliant dwellings, each with its own basement parking
• No shared basement—maintaining Class 1A classification
• Effective use of fire separation to maximise yield
• A built form that responds to both topography and neighbouring constraints

Fast Approval in a New Planning Framework

Even under relatively new legislation, the Development Application was:

• Approved in just 4 months from lodgement
• Successfully navigated through multiple amendment rounds (including landscape requirements)
• Delivered with a smooth, proactive approach to council engagement

What This Means for You

This project demonstrates that even highly constrained sites can deliver strong outcomes under the new planning controls when approached strategically.

If you own or are considering acquiring a site, there may be untapped development potential under Chapter 6 that wasn’t previously viable.

Let’s Unlock Your Site

Whether you’re a developer or a property owner, the key to success lies in:

• Understanding the planning pathways
• Designing to maximise yield while managing building classification
• Preparing a well-resolved, council-ready DA

Get in touch with McCullum Ashby Architects to explore what’s possible for your site under the new Low & Mid-Rise Housing provisions.

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We’re thrilled to share that our Roseville residential project has officially reached lock-up stage — and it’s looking absolutely incredible! The architectural form is now fully expressed, with soaring structure, clean lines, and a timeless design language that’s beginning to reveal the vision behind every detail.

Located within a Heritage Conservation Area (HCA) in the Ku-ring-gai local government area, this project has been shaped by a deep respect for the suburb’s distinctive character and the planning controls. These frameworks informed everything from site response and materiality to roof form and landscape integration, ensuring the design not only complies, but enhances its heritage context.

This milestone marks a significant step in the journey from concept to completion—and it’s a testament to the care, precision, and craftsmanship of our trusted construction partners, @MillersProjects. Their commitment and attention to detail have brought this stage to life beautifully, and we’re excited to continue the collaboration as the project progresses into internal finishes and final detailing.

We can’t wait to share more as the project evolves. This home is a true reflection of context-sensitive, contemporary architecture in a heritage setting, and we’re incredibly proud to see it taking shape.

Project location: Roseville, NSW

Stage: Lock-up complete

Planning context: HCA | Ku-ring-gai LEP & DCP

Watch this space for more updates as we move closer to completion!

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The site has just over 1,000m² of R2 zoned land and we are proposing six luxury units with basement car parking. The units range from 120m² to 200m² most with private gate entries and large courtyards and private balconies drenched in northern sun.

Project location: Wahroonga, NSW

️Stage: Concept design

Planning context: HCA | Low and Mid-Rise Housing Policy

Considering am LMR project? Call us today!

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If you’re considering a dual occupancy and have a lot more than 1,015m², excellent architectural design is key; innovative layouts, material selection and landscaping can ensure each home complements its surroundings and offers liveable spaces. Quality design doesn’t just unite two residences, elevates them both. As community members, homeowners, architects and builders, let’s champion well-designed dual occupancy projects and shape Ku‑ring‑gai’s future with care and creativity.

The current maximum floor space ratio (FSR) for detached dual occupancy development within Ku-ring-gai within R2 zoned land is 0.4:1 FSR.

As an example, if you have 1,500m² of R2 zoned land, subject to the site’s constraints, it may be possible to build a dual occupancy with two 300m² detached dwellings (that’s 600m² of GFA). This is currently much higher than available for a single dwelling which only allows for a maximum GFA of 470m² for a single dwelling on the same lot size under the LEP.

Considering a project? Let’s build better together, call us today!

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On the 28th of February 2025, the NSW Government’s introduced the Low and Mid-Rise Housing Policy set to reshape residential development in Wahroonga, aligning with broader efforts to increase housing supply and diversity across the state.
Under the State Environmental Planning Policy (Housing) 2021 (Housing SEPP 2021), this initiative will allow for dual occupancy homes, multi-dwelling terraces, and low-rise residential flat buildings within 800 metres of town centres and train stations. While these changes aim to address housing shortages, they have sparked discussions about their impact on Wahroonga’s heritage character and community identity.

The policy distinguishes between two key zones: the low and mid-rise housing inner area, which includes land within 400 metres walking distance of town centres and train stations, and the low and mid-rise housing outer area, covering land between 400 and 800 metres walking distance. These designations influence the scale and type of development permitted, guiding how Wahroonga’s residential landscape will evolve under the new framework.

With its tree-lined streets and historic homes, Wahroonga is known for its established charm, and any increase in density raises questions about how to maintain its unique appeal while accommodating growth. The policy introduces new housing types that bridge the gap between standalone homes and high-rise apartments, offering more flexible and affordable options for a range of residents, including young professionals and downsizers.

Among the architectural firms responding to this shift is McCullum Ashby Architects, renowned for designing sensitive, high-quality residential developments that respect existing neighbourhoods. With years of experience navigating local planning frameworks, McCullum Ashby is well-positioned to assist property owners in understanding their opportunities under the new policy while maintaining the suburb’s character.
“We view this as an opportunity to thoughtfully shape the future of Wahroonga,” said a spokesperson from the firm. “Our approach focuses on designs that complement the established aesthetic of the area while meeting the evolving needs of the community. Whether it’s dual occupancy homes that feel like a natural extension of existing streetscapes or well-integrated terraces that enhance walkability, we are committed to helping homeowners and developers create housing that fits within Wahroonga’s unique context.”

As Ku-ring-gai Council prepares for an increase in development applications, the conversation around sustainable growth and neighbourhood integration will be key. Some residents have voiced concerns about potential impacts on infrastructure and streetscape character, while proponents argue that well-designed housing can contribute positively to housing diversity without compromising Wahroonga’s identity.

Navigating these changes can be complex, but McCullum Ashy is here to guide clients through the process, from site feasibility assessments and design solutions to council liaison and planning support. As Wahroonga evolves, the firm remains dedicated to creating architecture that enhances rather than disrupts, ensuring the suburb continues to thrive while embracing the future of housing in NSW.

If you want to understand what potential your property has and unlock these new planning controls please contact the team @ McCullum Ashby Architects.

Tags: Low- and mid-rise housing, multi-dwelling terraces, dual occupancy, manor house, R2 zones, R3 zones, R4 zones, low- and mid-rise housing inner area low, low- and mid-rise housing outer area

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The design invites you to experience contemporary open plan living via striking, curvaceous spaces that harmonise yet redefine the elegance of the existing dwelling.

Gone are the days of 2d drafting, we now model our projects in 3d which allows to produce these great images so that our clients can clearly visualise the project from inception.

#McCullumAshby
#TeamMAA
#LindfieldHouse
#ArchitectLindfield

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The client’s brief was to design a new house in the rear yard of a corner block. The architectural design of the resulting detached dual occupancy, features a modern, contemporary style with clean lines, large windows for natural light, and open-plan living spaces. The home blends indoor and outdoor living, emphasising sustainability with energy-efficient materials and a lush, landscaped garden.

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In a sweeping revision of planning regulations, New South Wales has announced changes that will allow dual occupancy developments on all R2 zoned sites within the state. This significant policy shift marks a departure from previous restrictions, particularly impacting localities like the Ku-ring-gai Council area, where opportunities for such developments were previously limited to only a few designated sites.

Under the new rules, property owners in R2 zones across NSW will have greater flexibility to explore dual occupancy projects, aiming to accommodate the growing demand for housing diversity while maintaining the integrity of existing neighborhoods. This move is expected to stimulate housing supply and potentially ease affordability pressures in high-demand areas like Ku-ring-gai.

Among the architectural firms poised to capitalise on this regulatory change is McCullum Ashby Architects, renowned for their expertise in designing dual occupancies and low-rise housing developments. With a track record spanning several successful projects in similar contexts, McCullum Ashby Architects are well-positioned to assist property owners and developers navigating the complexities of the new planning guidelines.

“We welcome these changes as they open up new possibilities for innovative housing solutions,” said a spokesperson from McCullum Ashby Architects. “Our firm has a deep understanding of the intricacies involved in dual occupancy design within suburban settings, and we look forward to helping clients maximize the potential of their properties under the revised regulations.”

Local councils, including Ku-ring-gai, are preparing to manage the anticipated increase in development applications resulting from the policy shift. While some residents express concerns about potential impacts on neighborhood character and infrastructure, proponents argue that well-designed dual occupancies can contribute positively to housing diversity without compromising the area’s unique appeal.

The NSW Government’s decision reflects broader efforts to adapt planning frameworks to meet evolving community needs and housing demands across the state. As stakeholders adapt to the new regulatory landscape, architects and developers like McCullum Ashby Architects are set to play a crucial role in shaping the future of residential development in NSW’s suburban areas.

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