About Corniel Construction LLC

Experienced hands. A more considered way to build.

Corniel Construction helps clients turn complex renovation ideas into places they are proud to live and work in.

Our work is grounded in quality, reliability, and a personalized service that understands no two buildings — or clients — need exactly the same solution.

A steady partner

The details are where trust is built.

Personal ownership

A clear point of contact keeps decisions moving and communication direct.

Practical creativity

Every building has constraints. We look for the smart solution inside them.

Respect for the space

Protection, clean work, and thoughtful logistics are part of the craft.

Craft in the field

The finish is only as strong as the preparation.

Quiet, careful work shows up in the surfaces people live with. These process views are craftsmanship references, not residential project proof.

Wall-prep restoration detail during a verified construction process
Verified Corniel Work — process documentationWall-prep restoration detail.
Integrated renovation process composite showing coordinated interior work
Verified Corniel Work — process documentationIntegrated renovation/process composite.
Pre-renovation condition assessment during a verified construction process
Verified Corniel Work — process documentationPre-renovation condition assessment.

Owner education

What Manhattan owners should expect from a renovation contractor

A contractor is one part of a larger renovation system. The questions below help an owner evaluate that system before work begins.

Evaluate the fit, not only the finish

When comparing contractors, ask about experience with the building type and the kind of work you are considering. Also ask how board and DOB processes are coordinated, how decisions and changes are documented, whether insurance paperwork is ready for building review, and whether references or verifiable work can be provided. These questions help you evaluate working discipline; they are not a substitute for checking the details yourself.

Read the board approvals guide ↗

Understand who coordinates what

The owner sets priorities and makes decisions. The co-op or condo board and managing agent review the building’s requirements and protect shared interests. The architect or designer develops the design; licensed trades handle regulated work within their scope; and an expeditor manages filing logistics when one is engaged. The contractor coordinates field execution, sequencing, site protection, and communication around the work. Clear roles matter because no one party can replace the approvals or professional responsibilities of another.

Read the planning and architect coordination guide ↗

Treat insurance and COIs as a gate

Buildings request certificates of insurance to document that the project parties carry the coverage the building requires. From the owner’s perspective, the entity names should match the alteration agreement and the building’s instructions; a mismatch can delay review or mobilization. Coverage is building-dependent, and the building may require specific forms or endorsements. No specific limit should be assumed without checking the actual building requirements.

Read the Manhattan insurance and COI guide ↗

Plan for the building to stay occupied

Work hours, elevator reservations, protection of common areas, deliveries, access, and debris handling are operating requirements, not small details. The managing agent or building team may control parts of this schedule, so the renovation plan has to fit the building’s rules and the neighbors who share it.

Read the building rules and logistics guide ↗

Keep the record through closeout

A useful project record can include the agreed scope and plans, documented change orders, inspection and sign-off information, and closeout records that may matter at resale. We help coordinate alteration agreement requirements and DOB-related filings through licensed professionals when required. Final approvals remain with the building, board, or applicable agency.

Ask early where these documents will live, who is responsible for each closeout item, and what the building expects before a project is considered complete.

Built around your reality

Renovation is personal. The process should be, too.

Whether you are updating a newly purchased condo, restoring a townhouse, or managing a commercial interior, we take time to understand what success looks like — then organize the work around it.

What clients can expect

  • ✓ Direct, reliable communication
  • ✓ Careful planning around building rules
  • ✓ Experienced crews and quality control
  • ✓ A detailed closeout and walkthrough

Let’s make a plan

Bring us the first question.

Schedule Your Consultation ↗