Onyx & Iron ConstructionONYX & IRON
Aerial view of large-scale North Texas construction development site managed by Onyx & Iron

For Developers & Investors

Cost-Plus.
Full Transparency.

Turnkey owner's representation from market analysis to project delivery. A percentage on actual costs — not inflated bids. No change orders. No surprises. We answer the questions everyone else is afraid to.

The Problem

Traditional GCs Are Broken.

Most general contractors give you a fixed bid with fat margins baked in. Then the change orders start. By the time you're done, you've paid 20-30% more than you expected — and you have no idea where the money went.

They don't want you to see the real numbers. They don't want you asking questions. And they definitely don't want to explain why a $50K line item turned into $85K.

We do the opposite.

Our Model

Cost-Plus Owner's
Representation.

You pay actual costs for labor, equipment, and materials — plus a transparent percentage for our management. That's it. Every invoice, every receipt, every line item is yours to see.

No Change Orders
The scope is the scope. We don't manufacture surprises to pad the bill.
Full Cost Visibility
You see every dollar — labor, materials, equipment. Real numbers, not markups.
One Percentage Fee
Our fee is a percentage on actual costs. Simple. Aligned with your success.
Turnkey Delivery
From market analysis to keys in hand. One team, one point of contact.
Civil construction site grading and excavation for North Texas land development project

End-to-End

Every Phase. Turnkey.

01

Market Analysis

We study the numbers before you buy. Feasibility, comps, demand analysis, and projected ROI — so you make decisions based on data, not gut feelings.

02

Acquisitions Support

Due diligence on land and properties. We evaluate site conditions, zoning, utilities, and development costs before you close.

03

Value Engineering

We find ways to build smarter without cutting quality. Material alternatives, design optimizations, and process efficiencies that protect your margins.

04

Land Development

From raw dirt to pad-ready lots. Grading, utilities, roads, drainage, and subdivision infrastructure — all managed under one roof.

05

Vertical Construction

Commercial builds, data centers, warehouses, retail, housing developments — we build it all. Turnkey from foundation to certificate of occupancy.

06

Project Closeout

Punch lists, inspections, warranties, and final documentation. We don't disappear after the last nail — we finish what we start.

Large-scale commercial concrete pour by Onyx & Iron Construction in North Texas

What We Build

Any Scale.
Any Sector.

Subdivisions & Housing Developments
Commercial Buildings & Retail Centers
Data Centers & Tech Facilities
Warehouses & Industrial
Mixed-Use Developments
Land Development & Infrastructure

From a 10-lot subdivision to a 500,000 sq ft warehouse — we scale with you. Same transparency, same model, same accountability.

We Answer the Questions Everyone Else Is Afraid To.

Where did the money go? Why did the timeline slip? What are the real costs? Ask us anything. We'll show you everything.

Let's Talk Numbers.

If you're a developer who's tired of inflated bids and hidden costs, let's have a real conversation about your next project.

Schedule a Developer Consultation