Ecosystem map

Project core

One new single-family home

What matters most is not just who does work, but who approves, prices, interprets, coordinates, and records it.

Diagram

flowchart TD
    Core["One new single-family home"]
    Owner["Owner / sponsor"]
    Design["Architecture + consultants"]
    Builder["Builder / general contractor"]
    Trades["Subcontractors / trades"]
    Vendor["Vendors / suppliers"]
    Authority["City / county / state authorities"]
    Owner -->|scope, budget, approvals| Core
    Design -->|design intent, permit set| Core
    Builder -->|precon, schedule, coordination| Core
    Trades -->|estimate, crews, install| Core
    Vendor -->|quotes, deliveries, product data| Core
    Authority -->|zoning, permits, inspections| Core

Nodes

Node	Role in the system	Mini-tag
Owner and sponsor	(see operating-model notes for the dynamic description)	scope • budget • approvals
Architecture firms and consultants	Translate goals into drawings, specs, and permit/bid packages; interpret them during construction.	design intent • permit set
Builder and general contractor	(see operating-model notes for the dynamic description)	precon • schedule • field coordination
City county and state authorities (AHJ)	Adopt and enforce local rules, review plans, issue permits, inspect work, and sign off occupancy/use.	zoning • permits • inspections
Vendors suppliers and distributors	Turn scopes and selections into quotes, lead times, product data, deliveries, and warranty records.	materials • deliveries • product data
Subcontractors and trade contractors	Execute specialized scopes such as framing, MEP, roofing, drywall, finishes, and site utilities.	estimate • crew • install

Operating-model nuance for the two dynamic nodes

• Owner / sponsor in the production lane: Usually the builder-developer until a buyer signs. The end customer often enters midstream.
• Owner / sponsor in the custom lane: Usually a homeowner with land, budget, and design preferences from the start.
• Builder / general contractor in the production lane: Often both sponsor and constructor: land, plan package, procurement, trades, schedule, warranty.
• Builder / general contractor in the custom lane: Often enters after some design work, though preconstruction collaboration can start earlier.

Related notes

• Actors overview
• Process overview
• Information flows

Evidence

• S1 - U.S. Census Bureau - Survey of Construction definitions, S2 - NAHB Eye on Housing - Custom Home Building Share Declines in 2024, S3 - AIA East Tennessee - Design to Construction, S11 - International Code Council - Code adoption resources, S12 - SF Planning - Homeowners, S13 - Sacramento County - Building Permits & Inspection Division