V16 — system diagnostic

Home addition, sunroom and attic conversion

Coordinate siting, foundations, structure, roof, envelope, services, egress and permits when adding living area.

Checked: 2026-08-22

VERT / GREEN

Check zoning, setbacks, easements and feasibility before detailed design.

JAUNE / YELLOW

An addition changes loads, drainage, envelope, heating/ventilation and sometimes electrical/plumbing capacity.

ROUGE / RED

Roof/truss cuts, new foundation, load-bearing opening or attic without confirmed headroom/egress: professional design before work.

Pre-decision triage

Useful tools / data

  • Survey/site plan
  • Existing drawings and measurements
  • Budget including existing interfaces

What the professional checks

  • Design load path and foundations
  • Detail roof/envelope junction
  • Coordinate HVAC, plumbing, electrical, egress and permits
Related path

Continue with the right tools

These links connect this page to the next useful checks and decisions without repeating the full content.

Plan a complete construction projectConnect feasibility, design, permits, concealed work, commissioning and closeout.Open →Check permit triggersPrepare the questions and documents to confirm with the local authority.Open →Check a contractorDocument licence, insurance, scope, payments, changes and warranties.Open →Update a construction costEscalate a historical cost using comparable index values.Open →Prepare pre-delivery reviewRecord documents, enclosure, systems, finishes and deficiencies before closeout.Open →
V14

Systems to check before closing the work

V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesEnvelope and condensationCode versions
V19

Edge systems to integrate into the project

V19 covers interfaces that become important when multiple home systems interact.

Skylight/tubular daylighting

Legacy conditions and resilience systems

Check these before enclosing, excavating, modernizing or automating an existing system.

V26

Often-overlooked service interfaces

V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.

Attic hatch and pull-down stairs
V27

Project risks and overlooked interfaces

V27 connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.

Temporary weather protection during renovation
V28

Finish and service details to verify

V28 connects small details that become costly once finishes are closed.

Condensation in exhaust ductsAttic soffit baffles and ventilation

Before finalizing the project

V35 checks that can change drawings, permits, construction methods or structure.