Questions people ask before they start.

A short, sealed statement from a licensed professional engineer answering a specific question: is this structure adequate, was this work done to code, does this foundation meet the lender's standard. You need one when a building department, lender, insurer or buyer asks for an engineer's word in writing: missed inspections, covered work, after-the-fact permits, structural changes, product and component verification, manufactured home foundations for FHA/VA/USDA loans.

Yes. We assess the work, from photos and documents where the evidence allows or on site where it does not, and issue the letter or affidavit the building department needs to close the file. Where the work falls short we tell you exactly what it takes to fix.

Most remote letters issue within 1–2 business days of a complete record. Fixed-price certifications show the price first; everything else is quoted from your files, usually the same business day.

Manufactured home foundation certifications are $450 flat and Boxabl/modular letters $495 flat. Other letters typically run $295–$1,500 depending on scope; plans reviews typically $500–$700 for residential; energy calcs from $100 (whole homes up to 3,000 sq ft $250, plus $125 for duct design), and FEMA elevation certificates and 3D site scans from $450 in Central Florida. You see the number before you pay.

We prepare everything the application needs: sealed plans, calculations, letters, affidavits and the jurisdiction's forms. Submission, fees and scheduling are done by the owner or contractor on the county portal; we answer the reviewer's technical comments.

Most people come to us because their building department, lender or insurer has already told them they need an engineer letter, so we write it to answer exactly what was asked. Before you start, we recommend confirming with them what they need to see. If the reviewer comes back with questions or comments, we answer them and revise the letter, and if there is an issue we work with you to make it right. Acceptance is always the jurisdiction's call.

You find out before you pay. A licensed engineer reviews what you send and confirms the price or quotes the work before anything is committed; if your project is not something we can take on, we tell you up front. Manufactured home foundation certifications carry a 100% refund if we cannot complete them.

Often, yes. Your confirmation shows the standard delivery time, and when the schedule allows we offer a Priority option with an earlier delivery date, quoted per project. Ask for Priority in the intake or reply to your quote.

Every plan, calculation and letter is signed and sealed by a licensed professional engineer, typically with an electronic seal and signature accepted by building departments and lenders.

Sometimes. In the United States, most jurisdictions require a building permit for homes, additions and many outdoor structures such as decks, pergolas and larger sheds, and a permit usually means drawings that fit your site, local wind and snow loads and the code your county has adopted. A plan from the library is a strong starting point; for a permit it typically needs to be customized for your site and stamped by an engineer licensed in your state. Small accessory structures are sometimes exempt, and rules outside the U.S. differ, so check with your local building department first.

Tap “Customize + stamp” on any plan and pick what you need: changes to the size or layout, an engineer's review and stamp for your site, a site plan and permit support. Oasis Engineering sends one quote for the bundle before any work starts.

The studio that sold it. Bamboo Designs plans are sold and delivered through Bamboo Designs' own checkout, so downloads and refunds for those go to Bamboo Designs. Oasis Designs plans are sold here. For anything engineering, including customizing or stamping any plan, contact Oasis Engineering.