CALL US - (03) 9969 7764

Comprehensive Estimating Services in Melbourne, VIC

At Cornerstone Estimating Pty Ltd, we act as your commercial backbone. We handle your estimating, variations, payment claims, and contract risks before they cost you money. Servicing all of Australia.
Call Us - (03) 9969 7764

Cornerstone Estimating Pty Ltd

WIN MORE WORK, STOP CHASING PAYMENTS, AND START TAKING CONTROL

Are your margins getting chewed up by missed items, underpriced variations, and builders pushing back on claims? Are you flat out on site or juggling admin in the evening? By the time you realise you've been underpaid, it's already too late. At Cornerstone Estimating Pty Ltd, we act as your commercial backbone. We handle your estimating, variations, payment claims, and contract risks before they cost you money. We are built specifically for architectural trades and subcontractors doing $1-5M+ per year, and solve the following:
  • Pricing your jobs properly so you're not working for free
  • Getting paid for every valid Variation
  • Your Progress Claims are tight, compliant, and hard to reject
  • Your Contracts don't screw you over halfway through the job
  • Stop arguments before they start hurting your margins
  • Protect your profits so you can focus on delivering high-quality construction work on site
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  • Get clarity on Contracts
  • Keep more of your Profits
  • Become Building & Construction Industry Security of Payment Act (SOPA) compliant
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Our Services

Our service is built for commercial subcontractors who want certainty, leverage, and control in the Pre and Post Contract phases of construction projects, not after mistakes have been made and money already lost. We work alongside you during the build to help manage costs, variations, scope changes and manage risk as they happen. By being involved early and consistently, we help prevent margin loss rather than trying to recover it later.
We offer a monthly retainer package for clients who want to work with us continuously and keep us in their 'back pocket'. Continual Estimating, Contract Management and Quantity Surveying services guarantee you access to our time, attention and expertise indefinitely and on demand. This means priority support when decisions need to be made, clear oversight of capacity and risk exposure for the month, and the confidence to act without guessing or reacting too late. With us, you're not alone, and you don't have to do it yourself anymore. We help you with:
  • Estimating Services: Specialised professional services that calculate detailed project costs—including labor, materials, equipment, and overhead for you specifically.
  • Commercial Management for Subcontractors: Ongoing commercial support works during tendering and live projects.
  • Variation and Change Management: Focused on helping subcontractors identify, price, document, and get approval for variations before work is carried out.
  • Contract Review and Scope of Works Review: Covers contract reviews, scope of works, exclusions, risk clauses, etc. Helping subcontractors understand what they are actually responsible for before and during the job.
  • Margin and Cash Flow Protection: This will be covered by our estimating, tendering, contract management, payment claim preparation (aligned with SOPA), and payment schedule review and response (aligned with SOPA) services.
Our Services and Pricing

Who We Work With

We work with commercial subcontractors delivering architectural and finishing trade packages on construction projects. These trades typically operate in tight margins, complex site conditions and high-pressure environments where small missteps can quickly turn into major financial losses. Our role is to support these businesses through the commercial challenges that come with specialist trade work.
We regularly work with the following trades:
  • Flooring (carpet, vinyl, hybrid, timber)
  • Joinery & Cabinetry
  • Plasterboard, Partitions & Ceilings
  • Painting (internal and external)
  • Tiling & Waterproofing
  • Windows & Glazing
  • Balustrades & Handrails
  • Glass Balustrades, Shower Screens
  • Stone Benchtops, Stone Flooring & Stone Walls
  • Carpentry (fit-out & finishing)
  • Facade & Cladding (architectural / non-structural)
  • Waterproofing
  • Roofing (commercial & architectural)
  • Access Systems (ladders, platforms, façade access)
  • Architectural Metal Fabrication (non-structural)
  • External Louvres & Screens
  • Render & Texture Coatings
  • Landscaping
  • Caulking
  • Blockworks
If your business works in any of these trades and you're facing tight margins that pressure your finances, give us a call at (03) 9969 7764 to see how we can help.

Why Choose Cornerstone Estimating Pty Ltd?

In commercial construction, margin loss can come from poor estimating, rushed decisions, unclear scope, verbal instructions and changes carried out without proper approval. Once the job is finished, the leverage is gone, and the loss is locked in. Traditional cost advice often arrives too late to change the outcome.
Our approach focuses on cost consulting before and during live construction projects, where decisions still matter and leverage is high. By being involved early and staying engaged throughout the job, we help subcontractors early to avoid mistakes that quietly erode profit and turn manageable projects into financial headaches.
Early Involvement That Prevents Losses
Most margin loss starts with small decisions made under pressure. We stay involved during live projects so changes, risks, and site instructions are handled properly before they turn into unpaid work, redo costs or disputes.
Built for Subcontractors
Our service is designed specifically for commercial subcontractors and finishing trades. We understand where risk usually sits, how leverage is lost and what subcontractors actually need to stay in control on site.
Ongoing, Practical Commercial Support
You get consistent access to hands-on guidance when it matters. No reports that sit on a shelf, just clear advice, real-time support and a steady focus on protecting margins and cash flow throughout the job.
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Commercial Management for Subcontractors

Commercial Management is about staying in control throughout the full project lifecycle — from pre-contract planning and negotiation through to delivery and final account (both pre- and post-contract phases). Many subcontractors only feel the impact of poor commercial decisions after the job is finished, when target margins are already lost and commercial leverage has disappeared. Our estimating services in Melbourne, VIC provide ongoing commercial support before and during live projects, helping subcontractors assess risk, strengthen contract positions, respond to site changes, and make informed decisions as work progresses. This gives clients consistent access to expert support, clearer oversight of commercial exposure and the ability to maximise leverage at the right time and protect profit before issues escalate.
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Variation & Change Management

Variations are one of the most common ways subcontractors lose money. Work is often carried out under pressure, based on verbal instructions or assumptions, with the intention of sorting it out later. Our variation and change management service focuses on identifying changes early, pricing them properly, and ensuring they are documented and approved before work proceeds. By managing variations at the right time, subcontractors maintain leverage, carry out work that will be paid, reduce disputes and avoid absorbing costs that were never part of the original agreement.
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Contract Review & Scope of Works Review

Many commercial contracts contain unclear or conflicting scope, clauses with hidden risks and ambiguous inclusions that only become obvious once issues arise on site. This service helps subcontractors understand what they are actually responsible for, both before work starts and throughout the project. By reviewing contracts and scope documents, our construction estimating team in Melbourne, VIC helps identify gaps, overlaps, and risk areas early, so subcontractors can make informed decisions and avoid taking on unintended obligations.
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Margin & Cash Flow Protection

Strong margins and steady cash flow depend on more than winning the job. This service focuses on protecting the commercial position throughout the project lifecycle through estimating, tender management, contract management, and payment claim preparation aligned with the Building & Construction Industry Security of Payment Act (SOPA) requirements. We also review and respond to payment schedules in line with SOPA, helping subcontractors get paid correctly and on time. By doing this, we help you reduce financial stress, limit exposure and keep projects commercially viable from start to finish.
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Our Partners

Service Businesses we've partnered with and serviced:

How Our Contract Management Services Help Subcontractors

Our estimating company in Melbourne help you understand what you agreed to, what’s changed, and what you’re entitled to be paid for. We help subcontractors review contracts, clarify scope, identify risk clauses, and properly address instructions as they arise on-site.
When contracts aren’t actively managed, subcontractors often take on extra work without realising it. We guide clients through decisions before work is carried out, so changes are priced, documented, and approved instead of argued about later. If this is something you relate to and need help with, get in contact with us today and get started partnering up with our experts.
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What People Say

“Builder's always push us around on contract terms and payment delays. Cornerstone stepped in, and helped us get paid on a claim that was previously rejected. We won’t do another job without them.”
★★★★★
Keith Sandler
Focus Commercial Flooring
“We were spending so much time estimating and checking over quotes when we should be building the job. Kevin helped us ensure our estimates are detailed and easy for us and the builder to follow - we've definitely won more jobs since getting him involved.”
★★★★★
Elias Ishac
Lush Landscaping
"We had issues and disputes getting paid for variations - but since Kevin has come onboard, things run more smoothly for us and the Builder. I focus on site, and let him manage the Contract."
★★★★★
Henry Han
H&K Plastering

Frequently Asked Questions

1. What does Cornerstone Estimating actually do?
We help subcontractors price their work properly before the job starts and protect that profit once the job is underway. That includes estimating, tender prep, contract reviews, variations, payment claims, disputes, and more. Think of us as your commercial team.
2. Can Cornerstone Estimating help me manage my Contracts?
Yes, we can help you manage your contracts through our expert contract administration services. We review terms before you sign, handle payment claims and variations, and support you through disputes to protect your position. With a mix of quantity surveying and contract management expertise, we keep your projects compliant, cash flow secure, and risks under control.
3. What types of projects do you work on?
We work on a wide range of residential and commercial construction projects including new builds, renovations and multi-unit developments, as well as specialised subcontractor packages such as carpentry, flooring, landscaping, and joinery.
4. Who do you work with?
We work with subcontractors, builders, and property developers across Melbourne and Australia. Our services support trades and construction businesses of all sizes, providing estimating, tender management, and contract administration services that help you win more work, protect your cash flow, and reduce project risks.
5. Do you only work in Melbourne?
We’re based in Melbourne but work with clients all over Australia. Everything we do can be done remotely with email, phone, and shared documents.
6. The builder keeps rejecting my payment claims/variations, how can you help me?
We prepare clear, well-substantiated claims and variations that builders can’t easily reject, and if they still push back, we help you respond formally under the Contract and SOPA and even go to adjudication. Its important to be SOPA-compliant in submission of claims and variations as you have obligations under SOPA too.
7. Do you offer ongoing support or retainers?
Yes, we offer monthly retainer packages where we become your dedicated commercial support for the project - handling everything from claims, variations, contract notices, direct communication with the Builder, dispute resolution and so on.
8. Can you help me win more Tenders?
Yes, we provide professional, detailed estimates that help you price accurately, with confidence and present better than your competitors. We also manage clarifications and any changes so you stay on top of every opportunity.
9. What if I already have my own prices, can you still help?
Absolutely, we can vet your quote before submission, highlight any missing scope or risks and make sure your pricing holds up against the builder’s expectations.
10. How much do you charge for your services?
We have indicative pricing for all our services in our Services & Pricing page. As each service is custom tailored to the specific challenges and needs of the project, we are not able to provide a fixed price without first reviewing the project documents and drawings. Please reach out to us to get fixed fee pricing.
11. Do I need to understand the contract to work with you?
No, we’ll explain what your risks are in the Contract and help you make informed decisions before you sign or respond to anything.
12. How do I get in touch with Cornerstone Estimating?
You can reach out by visiting our Contact Page to fill out the form or simply send us an email at kevin.chang@cornerstoneestimating.com.au. Please note, we currently do not display a mobile number, but we respond quickly to email inquiries and aim to make the process as smooth as possible.
CORNERSTONE ESTIMATING PTY LTD
📞 Still thinking about it?Book a free, no-obligation chat. Let’s see if we’re the right fit.
Contact
📍 Melbourne-based. Available Australia-wide.
Kevin Chang - Director
Working Hours
Monday - Friday8:00 AM - 5:00 PM
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