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Home Addition Engineering · Orange County
Add the Space You Need Without Overlooking the Existing Home
Get the foundation, framing, roof, and connection design that ties your addition into the existing home—and give the permit reviewer and contractor clear structural documents.
- Check the existing home
- Design the new structure
- Resolve where they meet
Review
The proposed tie-in
Identify how the addition affects the existing home and site.
Design
The complete structure
Develop the foundation, framing, roof, and required connections.
Document
What the team needs
Prepare the agreed calculations, plans, details, and verification notes.
Start here
What kind of space are you adding?
Different additions place different demands on the existing home and site.
Service scope
What the addition design covers
The design must work for both the new space and the affected parts of the home.
- Existing framing and foundations where the addition connects
- New foundation, floor, wall, beam, header, and roof framing
- Connections and transitions between existing and new construction
- Gravity and seismic forces from the roof down to the foundation
Project deliverables
Deliverables matched to your project
We identify missing survey, soils, or field information before relying on it.
- Structural calculations based on the confirmed design inputs
- Foundation, floor, wall, and roof framing plans as applicable
- Beam, post, shear, holdown, and connection details as required
- Verification notes, plan-review responses, and construction clarifications when included
A clear path forward
Plan the tie-in before breaking ground
- 01Step Step 01
Share the addition concept
Send plans, surveys, photos, available records, and the space you want to add.
- 02Step Step 02
Design old and new together
We develop the foundation, framing, and connections around the agreed layout.
- 03Step Step 03
Use the completed documents
Take the agreed package into agency review, contractor pricing, and construction.
Why NBE
Resolve where the addition meets the house
The biggest structural questions often occur at the transition between old and new.
Review of the capacity and condition of affected existing elements
Clear roof, floor, wall, and foundation transitions
Structural options that protect the intended layout
Early identification of needed soils, survey, or field information
Clear Communication From First Question to Next Step
“They were very responsive, helped me salvage what I could from the previous firm, and provided the expertise and knowledge needed to finish the job quickly and efficiently.”
Frequently Asked Questions
What information is needed to engineer an addition?+
Existing and proposed plans, a site plan or survey when available, photos, known foundation information, and the architectural goals are useful starting inputs. Additional field verification may be needed.
Can the existing foundation support a second story?+
That requires evaluation of the current foundation, framing, material assumptions, and proposed loads. The result may be reuse, strengthening, new supports, or a revised design strategy.
Do additions require soils information?+
Requirements vary with site, foundation type, addition size, and jurisdiction. We identify the geotechnical information needed for the structural design.
Do you coordinate with architects and contractors?+
Yes. Coordination helps align structural depth, openings, roof geometry, constructability, and the permit set.
What happens if existing construction differs from the plans?+
We review documented field conditions and determine whether the design needs clarification or revision. Additional work is confirmed before proceeding.
Do I need architectural plans before structural engineering?+
A concept can be enough for early structural input, but full structural documents usually rely on a coordinated architectural layout, dimensions, openings, elevations, and site information. We can identify which inputs are still needed.
Show us the space you want to add
Send your plans or early concept, property location, and the type of addition you are considering.