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Retail parking requirements for a mixed-use development are set by the project’s local jurisdiction, zoning district, use definitions, and current code—not by a national retail-to-space ratio. Determine each use’s code minimum first, then test whether the uses’ parking demand overlaps by hour, day, and season. A shared-parking reduction is possible in some jurisdictions, but it normally requires an approved study, proof that spaces are available and safely connected, and sometimes a recorded agreement between property owners.
This guide provides a defensible process for a U.S. project when the site jurisdiction is known but the exact local ratios are not yet confirmed. It also explains how local examples from Sacramento County, Bedford, New Hampshire, and a Chandler code document differ, so none is mistaken for a transferable national standard.
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The controlling document is the current parking section of the code adopted by the municipality or other governing authority with land-use jurisdiction. Start with the jurisdiction and zoning district, then classify every proposed use under that code’s definitions. A project may include retail, housing, food service, office, entertainment, or other uses that each have different ratios, calculation units, exemptions, or approval procedures.
Record the code edition and any amendments, overlay district, planned-development approval, transit provisions, or special parking district that applies. Confirm whether the authority regulates spaces by floor area, dwelling unit, seat, employee, room, or another unit. Do not use a ratio from another city simply because the project has a similar tenant mix.
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The reviewed regulations demonstrate why a single national answer is not possible. Sacramento County describes a shared-parking program and requires an accepted study and approval. Bedford, New Hampshire, specifies study factors and accepted data sources in its 2024 regulations. A Chandler calculation example hosted by the City of Tempe uses six time periods and a distance criterion. These are local procedures, not a national formula.
For a project in an unidentified location, the correct output is a method and a list of information to confirm—not a guessed number of spaces.
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How do you calculate the baseline requirement for each use?
Calculate every use separately before considering shared parking. The baseline is the number produced by the applicable local table and definitions; it is not the same as observed demand or the number an owner would prefer to build.
- List the program. Identify each building, tenant or use category, gross and net floor area where the code requires it, dwelling units, seats, rooms, employees, or other relevant units.
- Apply local definitions. A “retail store,” “restaurant,” “market,” “personal service,” or “assembly use” may be treated differently even when tenants appear similar. Ask the planning department which definition controls for an unusual use.
- Apply the current ratio or formula. Keep a worksheet showing the source section, code edition, unit count, ratio, and resulting spaces. Note accessible-space, loading, bicycle, motorcycle, electric-vehicle, landscaping, or dimensional requirements separately if the code treats them separately.
- Separate requirements from forecasts. Label code minimums, observed occupancy, modeled demand, and an operational target in different columns. A lower observed count does not automatically replace a minimum requirement.
- Flag uncertainty. If a use has no obvious table entry, request an interpretation or approved analogy before designing around it.
This baseline remains the comparison point even when a shared-parking study is proposed. A reviewer can then see both the conventional requirement and the evidence supporting any alternative.
What do local shared-parking rules actually require?
Shared parking generally allows one space to serve more than one use when those uses have different demand peaks and the spaces remain available, accessible, and legally controlled. The details vary materially by jurisdiction.
| Local example | What the source illustrates | Important limitation |
|---|---|---|
| Sacramento County Code, Section 5.9.7 | Different demand patterns can support a shared-parking program; the code calls for an accepted study method, approval, and a recorded agreement. The online section notes amendments dated June 11 and September 10, 2026. | These are Sacramento County rules. They do not establish a percentage reduction for other jurisdictions. |
| Bedford, New Hampshire, 2024 Land Development Control Regulations, Section 322.3 | The study should address operating hours, daily and seasonal peaks, transit, access, pedestrian connections, and other site factors. ULI, ITE, another approved procedure, comparable-site data, and field surveys may be relevant depending on the proposal. | The regulation’s process and approval standards apply to Bedford; another authority may require different exhibits or methods. |
| Chandler code text in a City of Tempe-hosted development-standards document | The example calculates each use across six time periods, sums demand in each period, and uses the highest total. It also describes a generally 660-foot location criterion for shared spaces. | Verify that the text is current and applicable to the governing authority before relying on either figure. |
| APA Smart Codes model ordinance, Chapter 4.10 | Illustrates comparing the sum of individual-use standards with combined peak demand and allowing an administrator to accept a qualifying study. | A model ordinance is guidance, not binding law unless adopted locally. |
Sacramento County’s code states that “Land uses / buildings participating in the shared parking program demonstrate different parking demands.” That condition captures the central test: the uses must not require all of the spaces at the same time.
When does shared parking make sense?
Shared parking is most defensible when demand profiles are complementary. For example, a use that peaks on weekday afternoons may share with a use that peaks in the evening, but only if the actual schedules, access rules, and site layout support that assumption.
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Do not rely on stereotypes such as “retail is daytime” or “residents are overnight.” A grocery store, restaurant, gym, entertainment venue, medical office, school, or late-night business can shift the peak substantially. Residential demand may also be high during evenings and weekends, while retail demand can extend into those periods.
Evaluate overlap rather than adding each use’s individual maximum automatically. The sum of separate peaks may occur at different times and therefore overstate the combined peak; conversely, two uses may peak together and require nearly the full combined supply. The study must show the time periods and assumptions that produce the proposed requirement.
What information should a shared-parking study contain?
A reviewer needs enough information to reproduce the calculation and understand its weaknesses. At minimum, document:
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- Use schedule: each use, size, units, tenant or operating concept, opening and closing times, employee shifts, events, delivery periods, and expected changes by season.
- Demand evidence: adopted code ratios, published parking-generation or shared-parking references, comparable-site observations, and site-specific counts. State the edition and date of every external rate.
- Time periods: weekday, weekend, seasonal, and time-of-day intervals that capture likely peaks. Explain why the selected intervals are sufficient.
- Transportation context: transit service, sidewalks, pedestrian connections, barriers, driveway access, bicycle facilities, and distance from spaces to each use.
- Availability and control: ownership, leases, reserved spaces, employee restrictions, gates, pricing, validation, valet operations, and any other condition that could prevent a user from reaching a nominally shared space.
- Assumptions and sensitivity: vacancies, tenant turnover, event nights, weather or seasonal effects, and what happens if hours or floor area change.
Bedford’s regulation specifically identifies operating hours, daily and seasonal peaks, transit, access, and pedestrian connections as relevant. It also allows comparable-site information where standard rates are unavailable or limited and calls for field surveys when an existing facility is assumed. Those are useful quality checks even where another jurisdiction uses a different form.
How do you build a time-of-day demand schedule?
Create a row for each use and a column for each analysis period. For every cell, state whether the value is an adopted rate, published reference, comparable-site observation, field count, or professional estimate.
- Choose periods that reflect operations. Include the authority’s required periods, then add intervals that capture unusual conditions such as restaurant dinner, weekend shopping, evening entertainment, school dismissal, or residential overnight demand.
- Estimate or observe accumulation. Record the number of vehicles present during each period, not merely the daily total. If using a model, explain the source and adjustment factors.
- Align units. Convert each source to the same measure used by the local code, and show the conversion. Do not mix spaces per 1,000 square feet with spaces per dwelling unit without a transparent calculation.
- Identify simultaneous users. Show which spaces are physically and legally available to each use in each period. A space reserved for residents, employees, loading, or an event cannot be counted for another user during that reservation.
- Calculate combined demand. Add the demand of the uses that can actually share in each period. The largest combined result is the candidate shared peak, subject to the local method and review.
- Test sensitivity. Recalculate with plausible changes in hours, occupancy, tenant mix, or seasonal activity. A proposal that fails with a minor schedule change may need more spaces or operating controls.
How is the shared peak calculated?
Follow the jurisdiction’s prescribed method rather than importing a formula. In the Chandler example, each use is evaluated over six time periods, the demand totals are summed for each period, and the period with the highest total becomes the shared requirement. The example’s approximately 660-foot location criterion is likewise local and must be verified before use.
A generic worksheet can be structured as follows:
| Use | Period A | Period B | Period C | Period D | Period E | Period F |
|---|---|---|---|---|---|---|
| Retail | demand estimate | demand estimate | demand estimate | demand estimate | demand estimate | demand estimate |
| Residential | demand estimate | demand estimate | demand estimate | demand estimate | demand estimate | demand estimate |
| Restaurant or other use | demand estimate | demand estimate | demand estimate | demand estimate | demand estimate | demand estimate |
| Combined total | sum | sum | sum | sum | sum | sum |
Use the table to show the arithmetic, but do not call the result a guaranteed reduction. The authority may require a particular source, rounding rule, minimum number of spaces, management plan, or discretionary finding. The combined peak is evidence for review, not an entitlement.
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How do you verify that shared spaces are genuinely available?
Arithmetic is only half of the analysis. Confirm that the spaces can be used by the proposed users at the times assumed in the study.
- Distance: Measure the walking route, not just a straight line, and compare it with the local limit. The Chandler example refers to approximately 660 feet; another code may use a different distance or none at all.
- Safety and connectivity: Check sidewalks, crossings, lighting, grades, drive aisles, barriers, accessible routes, and wayfinding. A short but unsafe route weakens the shared-parking case.
- Legal control: Identify the owner of each lot and any lease, easement, covenant, condominium rule, or operating agreement that limits use.
- Time-based availability: Document when spaces are reserved for residents, employees, customers, loading, events, maintenance, or another tenant. Do not count the same space twice in a period when rights conflict.
- Operations: Explain gates, access cards, pricing, validation, attendants, enforcement, signage, and who will manage disputes.
- Physical capacity: Confirm that circulation, accessible spaces, fire lanes, loading areas, and queuing do not consume spaces shown in the worksheet.
Where parcels have different owners, the approval may depend on a binding agreement. Sacramento County’s example calls for a recorded agreement, and other jurisdictions may require provisions covering access, allocation, maintenance, management, duration, and remedies if the agreement ends. Ask the reviewing authority what form and recording evidence it accepts.
What approvals and documents are usually needed?
Ask the planning or zoning authority for its current checklist before finalizing the site plan or financing assumptions. A typical package can include:
- Site plan showing every space, route, entrance, accessible space, loading area, and shared facility.
- Use table with code classifications, sizes, hours, and baseline calculations.
- Shared-parking narrative explaining complementary demand profiles and the selected method.
- Time-period worksheet with sources, observations, assumptions, and sensitivity cases.
- Map and walking-distance exhibit for off-site or cross-parcel spaces.
- Ownership, lease, easement, or recorded-agreement documents proving access and duration.
- Management plan covering signage, enforcement, maintenance, allocation, and changes in tenants or hours.
- Findings or justification required for a discretionary reduction, variance, conditional use, or development agreement.
Some authorities accept a professional parking or transportation consultant’s study; others specify an approved procedure or require field counts. Bedford, for example, references ULI, ITE, or another approved procedure and allows comparable-site data where standard rates are limited. Confirm the accepted source and format in writing rather than assuming a consultant’s preferred method will be accepted.
What happens if tenants, hours, or ownership change?
Recheck the shared-peak analysis whenever the project program changes. A new restaurant, expanded floor area, later closing time, event use, residential occupancy change, or loss of an off-site lot can alter the controlling period.
Maintain a current inventory of occupied and vacant spaces and uses. Some local rules require renewed proof or records when uses change. The agreement should identify who must notify the authority, how substitutions are approved, and what happens if a parcel is sold, a lease expires, or shared spaces become unavailable.
If the recorded agreement lapses or access is blocked, the project may lose the basis for its reduction and be required to restore spaces, modify operations, or obtain a new approval. Treat the agreement and management plan as continuing obligations, not paperwork completed only at initial permitting.
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How should you compare a conventional calculation with a shared-parking proposal?
Compare the proposals using the same project program and local code assumptions. The headline number of spaces is not enough.
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|---|---|
| Peak demand | Which uses overlap, which period controls, and how does the result change on weekends or in peak season? |
| Evidence quality | Are inputs adopted rates, dated published data, comparable-site counts, or site-specific observations? |
| Geography and access | Are routes safe and accessible, are barriers documented, and does the walking distance meet the local rule? |
| Availability and control | Who owns the spaces, when are they reserved, and can another user legally claim them? |
| Approval burden | Is a study, discretionary finding, recorded agreement, or periodic report required? |
| Operational resilience | Would the supply still work after a tenant change, schedule extension, event, vacancy, or loss of a parcel? |
A lower shared requirement may be efficient, but it can carry continuing monitoring, legal, and management obligations. Include those obligations in the project schedule and operating budget.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are the most common mistakes?
- Using another city’s ratio: Local definitions, amendments, and approval standards control.
- Assuming a discount is automatic: A reduction generally requires an accepted method and an approval decision.
- Adding only the individual maximums: Separate peaks may not coincide, but overlapping peaks can be missed if the schedule is too simple.
- Ignoring evenings, weekends, and seasons: Restaurants, entertainment, residences, and tenant-specific hours can control the peak.
- Counting unavailable spaces: Reserved, gated, leased, or operationally restricted spaces cannot be treated as open supply.
- Confusing a model with law: The APA document is a model ordinance, and the Chandler text is an example requiring current verification.
- Presenting estimates as measurements: Label modeled rates, comparable observations, and field counts accurately.
- Omitting the agreement: Cross-parcel sharing needs enforceable access and management rights where the code requires them.
- Failing to plan for change: Tenant turnover and expired agreements can invalidate the original assumptions.
Can a worked example show the method without inventing a local ratio?
Yes. Suppose a project contains retail, apartments, and a restaurant, but the jurisdiction and ratios have not yet been supplied. The correct worksheet would leave the local rates open, then proceed in this order:
- Classify the three uses under the local code and calculate each baseline separately.
- List actual or proposed hours, including restaurant dinner service, resident arrival periods, retail weekends, and seasonal conditions.
- Choose the authority-approved time periods and enter a supported demand estimate for each use in each period.
- Exclude spaces that are reserved or inaccessible during a period, even if they are physically on the site.
- Sum only the users that can share in each period and identify the highest combined total.
- Compare that total with the conventional code calculation and explain every difference.
- Attach the walking-route, ownership, agreement, and management exhibits required by the jurisdiction.
This approach produces a reviewable result without pretending that a Sacramento, Bedford, or Chandler number applies elsewhere.
Which technical references can help?
Shared Parking, Third Edition, listed by the Urban Land Institute bookstore, is a 209-page paperback published in February 2020 (ISBN 9780874204278). The listing describes methods for estimating parking for mixed-use projects and notes a version that includes an Excel model. It is a technical reference, not a substitute for the current local code or the reviewing authority’s required procedure.
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For a complex project, a qualified parking or transportation consultant can help with counts, comparable-site selection, demand modeling, walking-route analysis, and preparation of the local submittal. The consultant’s work should still identify the governing code, source dates, assumptions, and approval criteria.
What should you confirm before relying on a parking number?
Before fixing the site plan, acquisition model, or financing around a shared-parking count, obtain confirmation of the following:
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- The governing jurisdiction, zoning district, code edition, and all amendments.
- The official classification and calculation unit for every proposed use.
- The authority’s accepted shared-parking method and required study periods.
- Whether comparable-site data, field counts, ULI or ITE references, or a consultant seal is required.
- The distance, pedestrian-safety, accessibility, and transit criteria for off-site spaces.
- Ownership, lease, recording, duration, and enforcement requirements for shared facilities.
- How tenant, floor-area, operating-hour, vacancy, or ownership changes must be reported.
- Whether the decision is administrative, discretionary, conditional, or subject to later review.
The resulting number is defensible only when the legal rules, demand evidence, physical access, and continuing controls all line up. If any of those elements is uncertain, preserve a conventional-code option until the authority confirms the shared arrangement.
Frequently Asked Questions
Can I use a national retail parking ratio for a mixed-use project?
No. The reviewed sources do not establish a universal retail, residential, or mixed-use ratio. Use the current code for the project’s jurisdiction and treat national or professional references as supporting evidence only when the local authority accepts them.
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Do shared-parking spaces have to be on the same parcel?
Not necessarily, but off-site sharing usually requires proof of legal access, safe pedestrian connections, acceptable distance, and availability during the relevant periods. Separate ownership may also require a recorded agreement or other enforceable instrument.
What if a proposed tenant is not listed in the parking table?
Ask the planning authority how it classifies the use before selecting a ratio. The authority may approve an analogous category, request a site-specific study, or impose conditions; do not choose the most favorable category without written confirmation.
How often should a shared-parking analysis be updated?
Update it when uses, floor areas, operating hours, ownership, access controls, or shared-space rights change. Keep records of occupied and vacant uses and check whether the local code requires renewed proof or approval after a change.
Is the highest combined time period always the final requirement?
Only when that is the method adopted by the governing jurisdiction. The Chandler example uses the highest total across six periods, but another authority may prescribe different periods, adjustments, minimums, or discretionary findings.
