Architects Seaforth
Architects Serving Seaforth | Du Plessis + Du Plessis Architects
With more than twenty-seven years working across the Northern Beaches, our architectural studio brings a steady combination of design clarity, regulatory strength and coastal understanding to projects near Seaforth. As a Registered Architect and Class 2 Building Practitioner practice, we design homes and multi-residential buildings with the confidence that comes from deep local experience - and a genuine commitment to thoughtful, long-lasting architecture.
Local Knowledge That Shapes Better Outcomes
A suburb shaped by elevation and light
Seaforth’s steep terrain, filtered harbour views, and coastal winds all influence how a building should be planned. These are not theoretical considerations - they directly affect comfort, privacy and long-term performance.
Insights built from decades in the area
We’ve been designing across the Northern Beaches since 1998. That continuity means we understand how orientation, natural ventilation and material durability behave in this part of Sydney.
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Local insight: near Seaforth, window placement often has a greater impact on liveability than floor area.
Why this matters to your project
Homes and developments here rarely fit into “standard” templates. Our architectural design team works with the constraints early, so decisions are clearer and approvals progress more smoothly.
Architectural Services Built for Seaforth’s Residential & Commercial Needs
Residential architecture with coastal intelligence
Our residential architecture practice designs new homes, substantial alterations and additions that consider the realities of Seaforth’s hillside and coastal environment. Robust materials, natural light and passive performance guide the work more than trends or aesthetics alone.
Multi-unit capability backed by Class 2 certification
The area also attracts developers and investors. As a Class 2 certified architecture firm, we design and lodge multi-residential buildings, dual occupancies and mixed-use projects — a capability now essential under NSW regulations.
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Professional advantage: Few local studios hold the required certification to lodge Class 2 work. We do.
Commercial architecture and workplace design
For business owners and real estate partners, we provide commercial and fit-out design with the same level of technical accuracy and director-level involvement.
In-house interiors for seamless detail
Interior architecture and interior design are handled within our small studio - a rare combination. This creates consistency from structure to materiality to the final details.
Luxury Residential Architectural Thinking, Without Excess
What “luxury” means near Seaforth
In this suburb, luxury is rarely about scale. It’s about craftsmanship, smart planning, and a building that feels effortless to live in.
Principles that guide every project
We focus on:
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Orientation and natural light
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Cross-ventilation
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Passive heating and cooling
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Coastal durability
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Long-term sustainability
These are the elements that give a home its quiet sense of refinement.
No signature look, your aesthetic leads
Some clients prefer minimalist lines. Others want heritage details, a Hamptons feel, farmhouse warmth or something more expressive. Our architectural studio does not impose a style. We design around your vision and let the building’s logic guide the outcome.
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Design philosophy: We create architecture that reflects the client, not the architect.
Regulations, Approvals & Complex Constraints Made Straightforward
Class 2 building practitioner advantage
Navigating approvals is often the most misunderstood part of a project. Our Class 2 credentials allow us to manage documentation and lodge multi-unit and dual-occupancy work in full compliance with 2024+ regulations.
Clear, human explanations of council pathways
We support clients through:
Development Applications
Construction Certificates
Heritage and zoning considerations
General compliance pathways
This guidance remains clear, grounded and non-committal - enough to give direction without making premature promises.
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Why this matters: Projects near Seaforth face coastal exposure, steep gradients and planning overlays. Confidence in the process matters as much as the design itself.
Subdivision and dual-occupancy expertise
For developers and property professionals, we bring experience in subdivision frameworks, dual-occupancy configurations and broader feasibility discussions.
Working With Homeowners, Developers & Real Estate Partners
Tailored support for each client type
Affluent homeowners value the steadiness of a director-led practice. Developers appreciate our technical literacy and multi-unit capabilities. Business owners and agents rely on our clarity around constraints and buildability.
Directors only - no layers, no handovers
Your project is led entirely by the two directors, both qualified architects. One of us answers the phone; both of us shape the work. This keeps communication clear and decisions efficient.
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A more focused practice: We only take on projects we can give full attention to.
Director-Led Architecture With Deep Local Insight
As a small residential architecture practice operating from a Northern Beaches studio, we remain involved from early planning through to technical documentation. We also bring the advantage of interior detailing in-house, creating buildings where the structure, proportions, and interior feel unified.
Our long-term presence in the area (reflected in our consistent 5-star rating) is built on reliability, local insight and a preference for designs that age well.
Recent Work Across the Northern Beaches & Mosman
Our portfolio includes projects across Manly, Balgowlah, Clontarf, Mosman and the wider Northern Beaches region. Many of these sites share similar gradients, view opportunities and coastal conditions found near Seaforth. This background informs us of the practical decisions we make on new work, from feasibility to construction detail.
Start Your Project With Local Architects Who Understand Seaforth
If you’re planning a residential, multi-unit, commercial or dual-occupancy project near Seaforth, our architecture firm is ready to help. Speak directly with the directors or reach us through the contact form to begin the conversation.
Frequently Asked Questions
1. Do you work on both residential and commercial projects?
Yes. We design single homes, multi-residential buildings, commercial spaces and interior environments.
2. Can you assist with multi-unit or Class 2 work?
Yes. As Class 2 building practitioners, we’re certified to design and lodge multi-unit residential projects.
3. How do you approach design style?
We don’t impose a signature aesthetic. Your preferences guide the design direction.
4. Do you help with council approvals?
We guide clients through DA and CC pathways and provide clarity on zoning, heritage and compliance considerations.
5. Do you offer interior design?
Yes. Interior architecture and detailing are handled in-house for cohesion and consistency.
6. Who will I deal with?
Only the directors. Your project receives continuous, senior involvement.