🪟 Boulder Window & Door Opening Modification Letter
Single Family Residential Projects
$700.00$559.00
Out of stock
🪟 Boulder Window & Door Opening Modification Letter
✅ Structural Certification for New or Enlarged Openings (Permit-Ready for City or County)
This Colorado PE-stamped structural letter is designed for any modification to a window or door opening in a load-bearing wall — including widening, relocating, or creating new openings.
The City of Boulder and Boulder County both require engineering when structural framing is altered, and this document provides the header, jamb, and wind pressure validation required to pass permit review.
🧾 What’s Included:
✔️ PE-Sealed Structural Letter (Colorado Licensed)
✔️ Wind Pressure Calculation (Zone 4/5, 10–20 ft² area)
✔️ Framing Load Path Analysis (header/jamb sizing)
✔️ Exposure Category & Wind Speed per jurisdiction
✔️ PDF File — Permit-Ready Upload
🪟 Use Cases:
New Window or Door Cutout
Widened Sliding Door Openings
Raised or Lowered Window Modifications
Exterior Wall Reconfigurations Remodels with Structural Framing Changes
📐 Engineering Specs:
Design Wind Speed: Vult 150–165 mph (City) or site-specific (County)
Opening Size Basis: 10 ft² (typ) or 20 ft² if applicable
Exposure: B, C, or D per ASCE 7 site review
Component Zone: C&C Zone 4 or 5 (based on opening location)
Framing Members: Header, Jamb, King/Jack Studs
Methodology: ASCE 7-16 or 7-22, LRFD
💬 FAQs:
Do I need engineering just to replace a window?
No — not for like-for-like replacement in the same size opening. But if the size or location changes, it's now a structural alteration.
What if I don’t know what the wall framing looks like?
We’ll make conservative assumptions and coordinate with your contractor to finalize member sizing once site conditions are known.
What zone pressure do you use?
We determine zone 4 or 5 based on building geometry, location on wall, and opening size. C&C tables are used for accuracy.
Is this valid for both City and County?
Yes — we verify jurisdiction and format the letter to meet the correct code version and wind speed requirements.
📩 Need Help Before Ordering?
Call us at 813-694-8989 or email info@oasisengineering.com — or use our quick intake form www.oasisengineering.com/contact
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