IMPETUS Construction, Inc.
General Contractor “B” Lic. #1135213
IMPETUS Modular, LLC
HCD ID #1621519
HCD ID #1621519
IMPETUS Construction, Inc.
General Contractor “B” Lic. #1135213
Your journey begins by filling out the Become a Client form on our website or by calling our office. Once we receive your request, a member of the IMPETUS team will contact you to schedule a brief 10-minute phone or Zoom call. During this conversation, we’ll listen to your goals, explore your vision, and share initial insights based on a preliminary review of your property. We’ll also walk you through the roadmap to success—starting with the Feasibility Study Report—and determine if we’re the right fit for your project.
($4,950 for SFR (R1-R4) and Detached ADU; $9,950 for Multi-family)
A comprehensive feasibility study is crucial for ensuring a successful, cost-effective, and smooth SFR, ADU or Multi-family project. Unlike basic reports, a thorough study dives deep into zoning regulations, site conditions, utilities, and a preliminary Title report with plotted easements to assess the project’s practicality and financial viability.
Our in-depth approach includes utility mapping, site topography surveys, floor plan, site plan, exterior renderings, and a build budget, helping homeowners avoid costly surprises and delays. Skipping this step often leads to unexpected issues like utility rerouting, unforeseen electrical panel upgrading or the distance of crane positioning to asset placement, thus mitigating such risks upfront, saving time and money, and allows for confident, informed decision-making.
It also integrates city-specific regulations and potential site challenges—such as septic systems, too many power cables, hillside grading or Historical Preservations — into a clear, actionable plan (Modular build? Panelized build? Traditional site-build?) This way, if the project proves unviable, the study prevents wasted investment; if viable, it serves as a foundation for the next step, a full set of permit ready CDs (construction documents).
After you sign the contract, this is where our team of architects and engineers—covering structural, mechanical, electrical, plumbing (MEP), and Title 24—collaborate closely with our Design Approval Agency director, while at the factory Structural Erection and Shop Drawings are drafted. Building on the solid foundation of the Feasibility Study Report, we work together to produce the Construction Documents (CDs) that must be submitted to…
The California Department of Housing and Community Development (HCD) partners with our Design Approval Agency (DAA) to review and approve the Construction Documents (CDs). IMPETUS Modular LLC is an HCD-authorized factory builder of Single-Family Residences, Accessory Dwelling Units, and Multi-Family Developments (HCD ID #1621519). This certification reflects our compliance with the State’s rigorous standards for delivering high-quality housing solutions to the California market.
As part of our process, local Planning and Building & Safety departments receive two sets of CDs:
This dual-submission approach sets us apart from many others, and leads to the next step in our Roadmap to Success…
Undergoing two rounds of plan check reviews—first by our DAA and then by the State—before reaching the local building authorities significantly accelerates the permitting process. It gives local agencies confidence, knowing that the CDs before them have already been reviewed and approved by the State.
This allows them to concentrate on the site-specific components: the existing site plan, the proposed site plan, and the site map with utility mapping. As a result, the overall permitting timeline is shortened considerably.
The process begins with material procurement, along with the preparation of steel erection and shop drawings—all of which take place concurrently with the permitting phase. While permits are being finalized, steel is ordered along with the mechanical, electrical, and plumbing (MEP) components. Insulation, drywall, fixtures, trims, and openings are also queued up and ready, so factory construction can commence as soon as building and grading permits are issued. Once permits are in hand, steel framing is erected and rough plumbing and electrical installations begin.
These are thoroughly tested by our skilled crew and subsequently inspected and verified by the California QAI (Quality Assurance Inspector) during their initial visit. With approval granted, we move on to insulation, flooring, drywall, carpentry, interior painting, and the installation of fixtures, mini-split HVAC systems, doors, trims, and openings. Meanwhile, over at the job site…
IMPETUS Construction, Inc. (General Contractor “B” Lic. #1135213) works on clearing the area of vegetation or structures, grading and excavating for drainage and foundation work, and trenching for water, sewer, gas, electrical, and stormwater systems.
Utility lines are extended from the main house or connected to municipal systems. With the site cleared and graded, formwork and footings for the foundation are installed, including stub-outs for all necessary utilities. Critical inspections follow—verifying grading, trenching, and foundation work before any concrete is poured.
Once inspections are approved and permits secured, the site is ready for SFR or ADU delivery and installation. For modular builds, aligning site prep with factory production timelines is key to keeping the project efficient and on track.
The QAI arrives once more to approve each turn-key Factory-built module.
The modules are then shrink-wrapped, heat-sealed and loaded onto the flatbed of a professional transporting semi. In a few hours, your SFR or ADU or Multi-family units, arrive at the job site, where the crane contractor with the crane, its operator and riggers, the IMPETUS Construction PM and assembly team, and the city inspector, all await its arrival. When the semi arrives, each module is checked for any transport damage, and staged in the order they’ll be installed.
The crane is then positioned strategically, lift points are connected to each module using certified rigging gear, with all safety checks and rigging preparations completed before lifting begins.
The first module is carefully hoisted and placed onto the foundation where it is welded and anchored to it, followed by the remaining modules, which are set, stacked, or aligned as necessary, and securely fastened together. After placement, structural connections are bolted, and the roof seams are sealed for weatherproofing. Utility connections for water, sewer, gas, and electricity are made between the modules and tied into the main service lines, followed by comprehensive testing and inspections. Finally, interior and exterior finishes are completed—such as drywall seam taping, paint touch-ups, siding, and trim—bringing the unit to completion and ready for the last step in our roadmap to success…
The final inspection following a modular installation is a thorough review by local building officials to ensure the SFR or ADU meet all applicable codes and was installed in accordance with approved plans.
Inspectors verify that the foundation and structural connections are properly secured and aligned, utility hookups for water, sewer, gas, and electricity are correctly installed and operational, and all weatherproofing and sealing at rooflines and module joints are effective. Mechanical, electrical, and plumbing systems are checked for proper function, and life safety features like smoke and carbon monoxide detectors, egress windows, and fire separation requirements are confirmed. Interior finishes such as flooring, trim, doors, and fixtures are assessed for completeness and quality, and any drywall seams between modules must be properly finished.
Exterior requirements like landscaping, pathways, and setbacks are also reviewed. Once all components pass inspection, a Certificate of Occupancy or Final Approval is issued, allowing the dwelling to be officially occupied. Congratulations! Enjoy your new IMPETUS home, ADU or apartment complex!
The high cost of building an Accessory Dwelling Unit (ADU) compared to a Single-Family Residence (SFR) in Southern California on a per-square-foot basis can largely be attributed to fixed baseline expenses that apply regardless of the size of the structure.
While an SFR may be double or even quadruple the size of an ADU, many of the same core costs—such as design and construction documentation, site preparation, general conditions, and specialty room installations—must still be incurred. For instance, ADUs require a complete set of architectural plans tailored to the specific property, even when using pre-approved templates, which means drafting costs remain like those for a larger home. General construction needs like dumpsters, project supervision, temporary facilities, and site safety measures are fixed costs that do not scale down proportionally with the square footage.
More critically, every ADU must still include the most expensive components of a home—a full kitchen and bathroom—which carry high material and labor costs due to plumbing, cabinetry, and appliances. Laundry facilities, if included, add another layer of complexity and cost. Additionally, vendors and subcontractors charge base fees for mobilization and tool setup, regardless of the job size.
All these factors combined mean that smaller units like ADUs can end up with disproportionately high per-square-foot costs—often reaching $500 or more—simply because the fixed costs are spread over a much smaller footprint. But at IMPETUS, you will see in our Feasibility Study Report how we consistently deliver the same high quality at 20%-30% less than others in the market. We outperform 100% of our competitors when it comes to value, pricing, and the unmatched strength of our builds.
Despite a staggering 30%+ increase in construction trade labor and material costs over the past five years, as reflected in the California Construction Cost Index (CCCI), IMPETUS remains committed to delivering value. With us, your asset is Built Strong – Priced Right.
On average, clients save 5%–10% compared to traditional site-built construction, and benefit from a build that’s completed 3 to 5 times faster—saving both time and money.
Our detailed Feasibility Study Report outlines the specific cost efficiencies you’ll gain by choosing IMPETUS as your design-build partner.
Building a multi-family development using modular, factory-built construction offers significant cost savings compared to traditional site-built methods.
Factory construction allows for streamlined production processes, bulk purchasing of materials, and reduced labor costs due to controlled working environments and minimized weather delays.
These efficiencies can result in savings of 10%–20% on overall construction costs. Additionally, modular projects are typically completed 3 to 5 times faster than site-built developments, reducing carrying costs, financing interest, and time-to-market, which accelerates rental income generation.
Our Feasibility Study Report will show you how, with fewer delays, reduced waste, and a more predictable budget, modular construction presents a smart, cost-effective solution for multi-family housing developments.
$4,950 for SFRs and ADUs. $9,950 for Multi-family
$7,950+ for ADUs; $12,950+ SFRs; $60,000 – $250,000+ Multi-family
$1,950 for ADUs; $2,950 SFRs; $3,950 SFR & ADU; $9,950+ Multi-family
$30,000+ for ADUs; $90,000+ SFRs; $200,000+ Multi-family
Soils Report: $4,000 – $10,000; Percolation Report: $3,000 – $6,000; Sceptic Tank: $15,000 – $30,000; Grading Plans & Drainage Survey: $5,000 – $8,000; Historical Preservation Reports: 11,000 – 15,000; Other reports may be needed such as Noise, Traffic, Forestry, Biological, Water Quality Reports and others
$18,000 /day (100-ton crane) – $40,000 /day ($300-ton+ crane)
$80,000 – $300,000 for ADUs; $350,000 – $1,000,000+ SFRs; $1.5M – $20M+ for Multifamily
ALL MATERIAL PRESENTED HEREIN IS INTENDED FOR INFORMATION PURPOSES ONLY. WHILE THIS INFORMATION IS BELIEVED TO BE CORRECT, IT IS REPRESENTED SUBJECT TO ERRORS, OMISSIONS, CHANGES, OR WITHDRAWAL WITHOUT NOTICE.
© 2025 IMPETUS Construction, Inc., CSLB General Contractor “B” License #1135213 and IMPETUS Modular, LLC, a
California State-approved Factory-built Housing Manufacturer (State ID #1621519) with the California Department
of Housing and Community Development (HCD).
All rights reserved.
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