Civil Street Improvement Plans (SIP)
Public right-of-way engineering, geometric design, and ADA-compliant infrastructure upgrades to secure municipal public works clearances.
What is a Street Improvement Plan?
A Street Improvement Plan (SIP) is a specialized civil engineering document required when a private development interfaces with public infrastructure. When a property is built or redeveloped, municipalities frequently mandate that the developer improve the adjacent public right-of-way. This includes the geometric design and structural profile alterations of public roadways, concrete curb and gutter systems, driveways, sidewalks, and localized street lighting networks to safely transition private property access into the city’s transit system.
Comprehensive Right-of-Way Capabilities
Grading & Public Works Clearances
Expediting approvals for mass tract grading, hillside slope stabilization, B-Permits, and ADA right-of-way improvements.
Multi-Agency Coordination
Concurrent management of approvals across overlapping jurisdictions, including local Public Works, Caltrans, Fire Authority, and local Water Quality Boards.
Environmental & Hydrology Approvals
Navigating strict SWPPP (Stormwater Pollution Prevention Plan) and WQMP (Water Quality Management Plan) submissions through local and state environmental agencies.
Plan & Profile Geometric Design
Engineering precise vertical and horizontal roadway alignments, calculating slope percentages, and ensuring smooth transitions to existing public asphalt.
ADA Public Accessibility Compliance
Designing meticulous sidewalk cross-slopes, pedestrian paths, and curb ramps that strictly fulfill federal and state accessibility standards.
Curb, Gutter, & Driveway Design
Crafting high-durability concrete profiles, catch basin tie-ins, and specialized heavy-duty commercial driveway aprons.
Other Civil Engineering Services
Permit Processing Rough Grading Drainage Design Erosion Control Hydrology SWPPP Water Quality Management Plans (WQMP) Low Impact Development (LID) Water Distribution Systems Precise Grading Sewer Design Utility Plans Utility Extensions Sewer Area Studies Drainage Improvements Fire Access Upgrades Dry Utilities Water System Plans Change of Use Zone Changes Conditional Use PermitsEngineering Public-to-Private Interfaces
Commercial Development Frontage: Widening existing public streets, adding dedicated turn lanes, and integrating transit bus-pad turnouts.
Residential Master-Planned Tracts: Designing complete interior public roadway grids, including cul-de-sacs, utility distributions, and residential sidewalks.
Transit-Oriented Urban Infill: Reconfiguring aging urban streetscapes, matching legacy public sidewalk grades, and executing complex utility potholing/relocation.
How We Secure Public Works Approvals
- Topographic & Right-of-Way Survey: We meticulously map the existing centerline of the street, public utilities, easements, and adjacent property grades.
- Geometric & Profile Layout: Engineering the detailed horizontal plan and vertical profile views, calculating cross-slopes to guarantee proper asphalt drainage.
- Utility Conflict Resolution: Coordinating with local utility providers to identify and resolve conflicts with existing underground gas, water, electrical, and fiber-optic mains.
- B-Permit & Public Works Processing: Pushing the civil sheets through rigorous municipal engineering reviews to clear performance bonds and secure encroachment permits.
Navigating Compliance & Regulatory Codes
Working within the public right-of-way introduces complex layers of liability and regulatory oversight. Our civil engineers design strictly to local APWA (American Public Works Association) standard plans, Caltrans geometric guidelines, and ADA Title II mandates. We are deeply experienced in processing complex public works permits—such as City of LA B-Permits—coordinating directly with city surveyors, traffic departments, and Bureau of Engineering inspectors to ensure plans are approved without multi-month delays.
Street Improvement FAQ
Why am I forced to pay for improvements to a public city street?
Under municipal codes, if your new development increases traffic, alters drainage, or changes property usage, the city shifts the financial and engineering burden of updating that immediate public infrastructure onto the developer through conditions of approval.
What is a B-Permit?
A B-Permit is a major public works permit required for extensive construction within the public right-of-way. It applies to street widening, installing new storm drains, or constructing major traffic signals, requiring fully engineered, signed civil plans and financial bonding.
How does ADA compliance affect my driveway design?
Sidewalks crossing a driveway apron cannot exceed a 2% cross-slope to remain wheelchair-accessible. If your property line sits on a steep street, our civil engineers must design specialized transitional transitions to meet this strict threshold.
Integrated Engineering Solutions
Street improvements require absolute accuracy; if a curb grade is off by a fraction of an inch on paper, water will pond on the public roadway, resulting in a failed field inspection. The Eden Group utilizes our in-house, high-precision land surveying teams to feed real-time topographical data directly to our civil designers. This closed-loop process ensures that our designs reflect exact field conditions, eliminating construction field-orders and ensuring rapid public works sign-off.
Secure Your Encroachment & Encroachment Permits
Protect your project from costly public works delays. Contact The Eden Group today for expert civil street improvement design and permitting.