How much does structural engineering cost for a custom home in California?

Structural engineering for a custom home in California typically runs between $4,000 and $15,000 depending on square footage, site complexity, and whether the lot is hillside. Hillside and seismic-sensitive projects sit at the higher end because of additional foundation analysis.

How long does structural design take before permit submission?

For a typical custom home, structural design takes 2 to 4 weeks from receipt of finalized architectural drawings. Hillside or multifamily projects may take 4 to 6 weeks. LPL coordinates directly with architects to hit permit submission deadlines.

Which states is LPL Consultants licensed in?

LPL Consultants is licensed to provide structural engineering services in California, Texas, Florida, and Washington.

When do I need a structural engineer for a hillside lot?

Any custom home on a slope greater than 15% generally requires a structural engineer with hillside experience. Building departments in California require stamped foundation drawings with soils coordination for hillside sites, and LPL has delivered foundation designs for hillside projects throughout the state.

Structural Engineering for Residential, Multifamily & Mixed-Use & Now with Civil Site Design

Q: What does a structural engineer do for a custom home?

A structural engineer designs the framing, foundation, and load paths that keep a custom home standing safely. For LPL clients, this means stamped drawings for foundations, framing, beams, shear walls, and connections — everything a plan reviewer needs to issue a permit.

We partner with architects, developers, and builders across 14 states to deliver on-time, permit-ready structural design and now site grading, drainage, and erosion control under the same roof.

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we DESIGN the STRUCTURE you DREAM

we are LPL

trusted partner in STRUCTURAL ENGINEERING

Our Expertise

Structural Engineering

Expertly crafted structural solutions ensuring strength, safety, and efficiency for every residential design.

Remodels & Additions

Thoughtful structural planning for seamless expansions, upgrades, and home transformations.

Seismic Engineering

Strengthening homes to withstand earthquakes and meet safety standards.

Retaining Structures

Creating durable retaining walls and support systems for stability and aesthetics.

Custom Builts

Delivering unique, client-tailored structural designs for new homes.

Collaborating Across All Sectors

Residential Clients

Commercial Clients

At LPL Consultants, we work closely with architects, builders, and contractors to deliver exceptional structural solutions tailored to commercial needs.

Institutional Clients

We partner with educational and healthcare institutions to provide safe, functional, and innovative designs that enhance the learning and healing environments.

Collaborating Across Sectors

Single-Firm Structural + Civil
One engineering team handles both your structure and your site — fewer handoffs, fewer RFIs, one point of accountability through permitting.

100+

Permitted Projects

LPL Consultants has successfully delivered and permitted over 75 projects across a wide range of industries and development sectors. Our extensive project experience enables us to support clients through complex permitting processes while ensuring compliance with applicable codes, regulations, and engineering standards.

15+

States Licensed

LPL Consultants is licensed to provide professional engineering services across 16 states in the United States, primarily including California, Washington, Oregon, and North Carolina. Our multi-state licensure enables us to support clients across diverse regions while maintaining compliance with state-specific engineering regulations and standards.

10+

B2B

LPL Consultants has successfully partnered with over 10 companies across diverse industries, delivering professional engineering solutions tailored to unique business requirements. Our collaborative approach enables us to support organizations through various project phases while maintaining quality, efficiency, and regulatory compliance.

Testimonials

Monica Phillips, Home Owner

Working with LPL was the smoothest part of our remodel projects’s preparatory work. They worked efficiently via 100% remote meetings with our contractors and delivered plans on time (even early!), within budget, and which were approved in the first permitting submission. This was no small feat in our city, where multiple plan corrections are the norm. After a year of design, planning, and approvals, we’re about to start demo - only with LPL’s deliverables did my husband and I high-five and fist bump on completion bc they so vastly exceeded our TAT and quality expectations. Highly recommend.

Eugene Keane, Home Owner

I recently engaged LPL Consultants to do the structural design work including seismic for the remodel of my 100 year old home in CA. They were always responsive in providing advice when field adjustments were required allowing us to keep the project moving and meeting all city inspections. They were transparent and fair and simply a pleasure to work with.

Brian Sholder, Home Owner

LPL Consultants was great to work with. They did excellent work and were on-time completing the project. They were also very responsive to emails and telephone calls. Thank you.

Don Leliefeld, Home Owner

We contracted LPL to do a roof structural design for the historic Washougal Grange. They were very responsive and easy to work with. We have also oused them for other smaller structural tasks on the project and they have provided timely drawings and claeifications. The ywere also helpful in dealing with the City to get permits issued

Brendon McDonnell, Home Owner

LPL is amazing. Great advice, timely service and professional, kind demeanors. I highly recommend them.

Aaron Musicant, Developer

We always use LPL because they are extremely responsive and timely and thorough in all their work

April Palencia, Architect, Vanguard Planning Inc

"I began working with Praneeth primarily via email. He is an excellent communicator, he is accurate with his scheduled deliverables, and provides prompt service. We occasionally speak on the phone to coordinate, and on Zoom, he is a confident and knowledgeable presenter. Our clients are grateful for his expertise."

John W, Home Owner

"Thanks again for all of your help & quick turnaround on our project in Port Orchard"

Ryan Hendrix Owner, DHRH Construction

"I’ve partnered with LPL consultants on various engineering projects, consistently achieving outstanding results through their expertise and innovative solutions."

Bobby Walker Principal Architect, Bobby Walker Design

"LPL Consulting has been fantastic to work with on a wide range of projects. Their ability to provide prompt answers to client and consultant requests has made them an invaluable team member. As an architect, I am always thankful for their well thought out correspondence. They have the ability to provide several solutions for a single problem, allowing all stakeholders to have the necessary information to make an informed decision. I look forward to working with Praneeth, and the team, for many years."

Sergio Ormachea, Associate, Vanguard Planning Inc.

“We have worked with LPL Consultants on several projects. They bring expertise, high-quality work, and excellent service to every job. When unexpected issues have come up during design and construction phases, they have been able to provide effective solutions. We look forward to future projects with the team at LPL Consultants.”

FAQs

What does a structural engineer do for a custom home?

A structural engineer designs the load-bearing system of your home — the beams, columns, shear walls, and foundation that keep it standing under gravity, wind, and seismic forces. For a custom home, we analyze your site conditions, architectural plans, and local code requirements to produce stamped structural drawings your contractor can build from and your building department will approve.

How long does structural engineering take for a permit submittal?

For a typical custom home or ADU, expect 3–5 weeks from kickoff to permit-ready drawings. Complex projects — hillside sites, multifamily, or projects requiring peer review — may take 6–8 weeks. We communicate timelines upfront and flag issues before they delay your permit.

Do I need a structural engineer or a civil engineer?

Most projects need both. A structural engineer designs what holds the building up — foundations, framing, shear walls, retaining walls. A civil engineer designs the site around it — grading, drainage, stormwater, and erosion control. LPL now provides both in house, so the two sets of drawings are coordinated before they reach your building department instead of after.

What states is LPL Consultants licensed in?

LPL Consultants holds active engineering licenses in Alaska, California, Florida, Hawaii, Idaho, Illinois, Michigan, Mississippi, Montana, Nebraska, North Carolina, Oregon, Texas, and Washington. Each project is stamped by the licensed engineer of record for that state.

What types of projects does LPL work on?

We specialize in custom residential homes, ADUs, multifamily buildings (duplex through mid-rise), hillside and challenging terrain projects, and structural permit packages. Our clients include architects, general contractors, developers, and homeowners.

What civil engineering services does LPL provide?

Site development and grading plans, stormwater and drainage design, and erosion control and permitting support for residential, multifamily, and mixed-use projects. [Add scope boundary — e.g. we do not currently provide traffic, transportation, or municipal infrastructure design.]

Is LPL licensed for civil engineering in my state?

Our civil licensure differs from our structural licensure — contact us with your project location, and we'll confirm before you commit

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