Expert Building Design in St Marys
St Marys is a well-established suburb in Sydney’s west, offering a blend of heritage character, suburban convenience, and new residential growth. It features a mix of older cottages, contemporary homes, and increasing townhouse developments due to its excellent transport connections and proximity to the future Western Sydney Airport.
DMR Designs provides customised building solutions in St Marys, balancing modern living needs with Penrith City Council’s planning regulations to create homes that are practical, stylish, and compliant.
We proudly deliver designs that reflect St Marys’ evolving community while respecting its established charm.
Why Choose DMR Designs for Building Design in St Marys?
Versatile Styles: From heritage-inspired to contemporary designs.
Community-Focused: Plans tailored to families, professionals, and investors.
Compliance Made Easy: Expert navigation of Penrith City Council requirements.
Smart Sustainability: Energy-efficient solutions to reduce long-term costs.
Flexible Living Spaces: Designed for multi-generational living and future growth.
Our St Marys designs provide a balance of timeless appeal and modern functionality.
Blacktown City Council Requirements for Building in St Marys
Zoning types
R2 Low Density Residential
R3 Medium Density Residential
Setbacks
Front setbacks typically 4.5m – 6m
Side and rear setbacks depend on lot size and dwelling type
Typical lot sizes
Detached homes: 450m² – 700m²
Medium-density/townhouses: 250m² – 400m²
Key constraints
Flood-prone land in some areas near creeks
Noise mitigation near railway and major roads
Heritage conservation zones for older precincts
Utilities available
Fully serviced with water, sewer, gas, electricity, and NBN
Designing in St Marys requires sensitivity to both new development and established character areas.
For detailed council regulations and submission guidelines, visit the Blacktown City Council website.
DA vs CDC: What’s Right for Your St Marys Project?
Whether it’s a Development Application (DA) or a Complying Development Certificate (CDC), we’ll guide you in finding the fastest and most compliant approval pathway—anywhere in New South Wales.
Here’s a quick breakdown to help you understand the difference:
DA (Development Application):
Required for townhouses, multi-dwelling housing, or homes in heritage zones.
Needed for projects that don’t meet CDC numerical standards.
CDC (Complying Development Certificate):
Suitable for straightforward single dwellings, extensions, and secondary dwellings.
Provides a faster route for compliant projects outside heritage or flood-affected land.
Need help figuring out which route suits your site? We’ll assess your block and walk you through your options.
FAQs About Building Design in St Marys
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Yes, if zoning permits and lot size requirements are met under Penrith City Council.
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Yes, certain streets and precincts require heritage-sensitive designs.
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Some sites near low-lying areas may need flood studies and mitigation measures.
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While we know the Blacktown area well, we also work across many suburbs within the Blacktown City Council area, including Doonside, Mount Druitt, Quakers Hill, and more. Additionally, we are available for select projects up to 4 hours away from the Blacktown Council area.
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Cost depends on the scope of your project. We’ll walk you through pricing during your discovery call so you know exactly what to expect.
Ready to take the next step?
From spacious family homes to specialized compliance plans, we’re here to help you move forward with clarity and confidence. We’d love to hear about your Blacktown project and how we can assist.
Our Building Design Services in St Marys
We create tailored designs for new homes, duplexes, and townhouses in St Marys, ensuring council compliance and lifestyle-focused outcomes.
From first sketches to approvals, our team helps bring your project vision to reality.
What to Expect: Our Building Design Timeline
A step-by-step look at how we take your project from concept to council approval and beyond.
Every project starts with a discovery call and ends with council-approved, build-ready plans.
Here’s how we make it easy from start to finish:
Step 1 - Discovery Call
Let’s chat! We’ll have a quick call to understand your project and see how we can help.
Step 2 -Site Visit & Consultation (5–7 days)
We’ll meet at your site (or virtually), take a closer look, and discuss your vision in detail.
Step 3 - Fee Proposal (2 days)
You’ll get a clear, no-surprises proposal with the scope, timeline, and costs.
Step 4 - Concept Design (4 weeks)
We’ll create initial design ideas and layouts tailored just for you.
Step 5 - Design Development & Expert Coordination (2 weeks)
We’ll fine-tune the design and collaborate with any needed specialists (engineer, energy consultant, town planner, geo tech engineer, bushfire, heritage consultant, etc).
Step 6 - Final Adjustments (1 week)
We’ll polish everything and prepare the final drawings for submission.
Step 7 - Submission for Approval
We handle the council or certifier submission, so you’re ready for the next steps.
Want the full breakdown?
From Plans to Reality: See How It All Comes Together
View our St Marys portfolio to see homes blending heritage respect with modern living.
Portfolio
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Home Designs
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With DMR Designs, your St Marys project will be designed for success.
Ready to Start Designing Your New Home in St Marys?
We’re here to help you take the next step, whether you’re
starting fresh or upgrading your Blacktown City home.
We’d love to hear what you have in mind. Book a discovery call or send us a message, and we’ll be in touch within 48 hours.
Not based in St Marys?
DMR Designs proudly works with homeowners across the entire Blacktown City Council area. From Doonside and Mount Druitt to Quakers Hill and beyond, we bring the same personalized design approach to every project—no matter where you call home.