EngineerLetters.co · powered by Oasis Engineering
A licensed engineer's word, in writing, in days.
Sealed letters for building departments, lenders and insurers. Where the work can be verified from evidence, you capture it with our guidance and a PE reviews the record. Where it can't, we come out. Either way, you know which before you pay.
- 1–2 days
- Typical turnaround
- 38 states
- Firm licensure + USVI
- Price first
- Fixed or quoted before work
Pick your situation
Three doors. Two minutes.
Permit or inspection letter
Missed inspection, covered work, after-the-fact, structural change, product or component.
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Manufactured home foundation
FHA / VA / USDA / conventional closings. $450 flat, 1–2 days.
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Boxabl or modular foundation
Certify the install for the lender or county. $495 flat.
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How it works
Guided capture. Engineered judgment.
- Step 1
Tell us what you have
A few taps, then upload photos, permits or plans. The intake tells you exactly what is needed for your case, and whether it is remote-eligible, before anyone commits.
- Step 2
Capture, or we visit
For remote-eligible work you follow a photo and document checklist built for your case. Concealed, risky or ambiguous conditions go to a site visit instead — we tell you before you pay.
- Step 3
Reviewed, sealed, delivered
A licensed PE reviews the record, issues the letter under seal and delivers it by secure link, addressed to whoever asked for it.
What a letter can cover
If someone wants an engineer to put it in writing.
Residential, commercial or industrial — a sealed letter is a professional assurance of a specific fact about your project. The common asks:
Permits & inspections
- Missed or after-the-fact inspections
- Permit close-outs, changes and revisions
- Expired permit solutions
- Construction verification
- Design-professional inspection forms (e.g. NC Appendix G)
- Re-roof affidavits, dry-in and roof certifications
Lenders & closings
- Manufactured home foundation certifications (HUD 7584)
- Modular and Boxabl foundation letters
- Pre-purchase structural evaluations
- Condominium conversions
- Flood zone and elevation questions
Structure & foundations
- Load-bearing capacity certifications
- Structural modifications and wall removals
- Foundation repairs and certifications
- Engineered foundation letters for Texas cities (Denton, NRH, New Braunfels, Grand Prairie, DFW, Houston…)
- Retaining walls, decks, pergolas and additions
Products & systems
- Installation of specific equipment or building components
- Florida wind calculations and engineering reports
- Well capacity certification (Texas TCEQ)
- Safety audits, repairs and design validation
- Insurance claims and legal disputes
Services
Letters and certifications.
EngineerLetters.co Engineer Letters
Signed and sealed engineering letters for permits, property transactions and project-specific requirements.
EngineerLetters.co Manufactured Home Foundation Certification (HUD 7584 / PFGMH)
Sealed foundation certification letters for manufactured homes, for FHA, VA, USDA and conventional loans.
EngineerLetters.co Modular / Boxabl Foundation Certification Letter
Sealed letter certifying the factory-built unit is installed on a permanent foundation per approved plans.
Roof Engineer Letter
Roof inspections and sealed roof letters for permits, re-roof closeout and compliance.
Tampa Bay In-Person Engineer Inspection
Site visit plus sealed letter or report.
In-Person Engineer Inspection — We Come to You
In-person site inspections by our field engineering team, with a sealed letter or report.
From the blog
Letters, explained.
Questions
What is an engineer letter?
A short, sealed statement from a licensed professional engineer that answers a specific question — is this structure adequate, was this work done to code, does this foundation meet the lender's standard. Building departments, lenders and insurers accept it as a professional opinion of record.
Can it be done remotely?
Often. When the work is visible or was documented before it was covered, we guide you through capturing photos and documents and a licensed PE reviews that record. When conditions are concealed, ambiguous or structurally risky, we say so up front and schedule a visit — we travel several times a month across the states we are licensed in.
How fast?
Most remote letters are issued within 1–2 business days of a complete record. Fixed-price certifications show the price first; everything else is scoped and quoted before any work begins.
What does it cost?
Manufactured home foundation certifications are $450 flat and Boxabl / modular letters $495 flat. Other letters typically run $295–$1,500 depending on scope, and you see the number before you pay.
Ready?
Two minutes to start. A real engineer reviews your project.
Engineer letters are delivered through EngineerLetters.co, powered by Oasis Engineering.