Glossary of Terms

This glossary is intended to support a general understanding and consistent interpretation of terms used throughout the comprehensive plan. It is not intended to replace or supersede more precise or legal definitions established in other city or county plans, codes, or regulations. Where more specific definitions exist, those sources should be consulted.

Illustration of three smiling community members — a man in a t-shirt, a uniformed officer with a radio, and a woman in a hijab holding books.

Policy Glossary

Accessory Dwelling Unit (ADU)

A separate and complete single housing unit within a detached dwelling unit or within an accessory structure to the principal dwelling unit of the lot or parcel on which the unit is located.

Accessory Commercial Unit

A commercial space located within a residential parcel that is secondary to the primary residential use.

Annexation

The process of moving unincorporated land into a municipality’s boundary and jurisdiction. Annexation of unincorporated lands into the City of Boulder must meet certain conditions established by Colorado Revised Statutes and Boulder Revised Code.

Area Median Income (AMI)

The midpoint of a specific region’s income distribution, calculated annually by the U.S. Department of Housing and Urban Development (HUD). AMI varies by location and household size. AMI is used to determine eligibility for affordable housing and rental assistance.

Boulder Valley

The area identified in the Boulder Valley Comprehensive Plan, Planning Areas Map. The Boulder Valley includes land within the City of Boulder and portions of unincorporated Boulder County.

Capital Improvement

A permanent physical alteration or repair that enhances a property’s value, increases its useful life or adapts it to new uses. In the city, capital improvements are planned on a six year timeframe through the Capital Improvement Program (CIP).

Community Members

All who live, work, learn, visit or have an interest in the community.

Community Resilience Hub

A facility that supports the community during both routine and emergency conditions by providing essential services, resources and safe space. Resilience hubs may offer access to water, energy, communications, shelter, medical supplies and other critical supports during disruptions.

Enclave

Land within unincorporated Boulder County that is entirely contained within the outer boundaries of the city.

Equity

Equity is an intentional, ongoing process of changing policies, practices and systems to eliminate institutional racism and address historical disadvantages that have disproportionately affected people based on gender, sexual orientation, ability, class and age, among others. The city focuses on leveling the playing field, prioritizing equity as a driver for social justice to improve outcomes for all community members, particularly those most often excluded by government.

Home-Based Business

A small-scale business operated at a private home by the residents that is secondary to the residential use.

Language Access

Services that help ensure inclusive government and meaningful participation for individuals with limited English proficiency, focusing on translation, interpretation and inclusive engagement.

Level of Service Standards

Metrics that define the minimum acceptable capacity, quality and availability of public facilities and services necessary to support urban development within the Boulder Valley.

Micromobility

Transportation options that are low-speed, lightweight, small and can be human or electric powered. They can be personally owned or use shared services and connected technology.

Middle Housing Types

A range of housing types that typically provide fewer units than multi-unit buildings but more than single-unit dwellings. Examples include duplexes, triplexes, fourplexes, townhouses and courtyard clustered units.

Middle-Income Housing

Housing that is affordable to middle-income households. Middle-income in the city is defined as ranging between 80 and 120 percent of the Area Median Income (AMI).

New Urban Development

  • Any proposed development and/or redevelopment within Area 1-Urban Lands.
  • Any proposed development and/or redevelopment within Area 2-Urban Edge, Area 3-Rural Preservation or Area 3-Planning Reserve that is determined to require additional services to be provided by the city.
  • Any proposed development and/or redevelopment within Area 2-Urban Edge, Area 3-Rural Preservation or Area 3-Planning Reserve that is determined to be inconsistent with the Boulder Valley Comprehensive Plan or Boulder County Land Use Code.

Over-Intensive Rural Development

Development or redevelopment of land within Area 3 that, due to its scale, intensity or impacts is determined to be inconsistent with the surrounding rural character and the intent to preserve that character. The following are examples of factors to be considered when determining over-intensive rural development:

  • Project Scale
  • Project Intensity
  • On-site disturbance and creation of impervious surface
  • Off-site impacts such as traffic or increased activity
  • Adequacy of public services and/or infrastructure

Permanently Affordable Housing

A home whose affordability is legally protected in perpetuity through a deed restriction, covenant or land trust.

Service Area

The geographic area where the city may provide urban services and is already within city limits or where annexation is supported by the plan. The service area includes the following planning areas: Area 1-Urban Lands and Area 2-Urban Edge.

Substantially Developed

An area or parcel that is already improved or built out (e.g. with structures, roads or utilities) to the degree that opportunities for significant additional development are limited.

Urban Conflagration

A large fire, often uncontrollable, that spreads rapidly through urban and/or densely populated areas. This type of emergency is often caused by wind-driven embers from wildfires, when typical fire suppression measures, typically located at the wildland-urban interface are overwhelmed by the event. In Colorado, wildfire initiated community conflagration (WICC) is becoming more common.

Urban Services

Services provided by the City of Boulder including public water, public sewer, stormwater and flood management, urban fire protection and emergency medical care, urban police protection, multi-modal transportation and developed urban parks.

Urban Service Provider

An entity responsible for planning, financing, operating and maintaining adequate urban services.

Vision Zero

Vision Zero is the community's goal to eliminate all severe traffic-related crashes that result in a serious injury or fatality.

Wraparound Services

A coordinated approach to service delivery that addresses a range of needs of individuals or households, including health, social, educational and supportive services.

Wraparound services are intended to provide integrated support, improve outcomes and enhance well-being across multiple aspects of daily life.

Zoning

The local regulatory system that regulates land uses and development for each property. Zoning for the City of Boulder is defined in the Boulder Revised Code and zoning for Boulder County is defined in the Boulder County Land Use Code.

Future Land Use Glossary

The following terms are used to define expectations for the Future Land Use designations in this plan.

Agriculture

Includes the cultivation of soils and crops and the raising of animals to provide food, fiber and other products.

Arts, Culture and Entertainment

Private facilities that provide entertainment for a fee, such as theaters, cinemas, music venues and cultural event venues.

Attached Unit

Housing unit that is attached to another housing unit via shared walls, roofs, or foundations and feature independent entrances, kitchens and bathrooms. Examples include townhomes, duplexes and triplexes.

Detached Unit

A standalone, self-contained principal housing unit that shares no walls, roofs, or foundations with other buildings.

Education

Provide instructional, academic, or training services, including public or private schools, colleges, universities and specialized educational or research institutions.

Food and Beverage

Includes establishments that prepare and serve food or beverages for consumption, on or off the premises, including restaurants, cafes, bars and similar services that may serve residents, workers, or visitors.

Government, Healthcare and Institutional

Public or nonprofit facilities that provide governmental services, healthcare, social services, or institutional functions for the community.

Group Living

A residential structure whose uses are characterized by needs of a specified group of people. The residents may receive any combination of care, meals, or treatment, as long as they also reside at the site. Examples include assisted living facilities, skilled nursing facilities and residential treatments centers.

Heavy Industrial

Includes larger-scale manufacturing, processing, or material handling that may generate higher levels of noise, emissions, or truck traffic and typically require separation from sensitive land uses.

Light Industrial

Includes manufacturing, processing, assembly, repair, or fabrication activities conducted within enclosed buildings and generally producing limited noise, vibration, odor, or traffic impacts. Includes indoor agricultural facilities.

Lodging

Provides temporary accommodation for visitors, travelers, or guests, including hotels, motels, inns and similar facilities, often with accessory services such as meeting rooms, dining, or limited retail.

Maker, Artisan and Innovation

Includes on-site creation of custom or handcrafted goods using hand tools or small equipment. May include accessory retail sales, classes, demonstrations and limited events that support production activities.

Multi-Unit

Housing unit structure that typically includes more than four housing units and features shared entrances and amenities. Examples include apartments, efficiency living units and condominiums.

Office

Includes businesses providing professional, financial, administrative, medical or technical services to individuals or other businesses, including accounting, legal, insurance, real estate, counseling, publishing, architecture, engineering and design services. Shared or co-working spaces, typically accessed through membership or lease arrangements, are included.

Open Lands

Includes undeveloped areas that may have value for open space purposes.

Open Space Purposes

Open Space purposes is generally defined as including, but not limited to, preservation and restoration of natural habitat and features, agricultural stewardship, floodplain protection, education, cultural resource protection and passive recreation.

Purposes are more specifically defined by the City of Boulder Charter or county open space tax-enabling ballot language. For reference, the City of Boulder Charter states:

Open space land shall be acquired, maintained, preserved, retained and used only for the following purposes:

  • Preservation or restoration of natural areas characterized by or including terrain, geologic formations, flora, or fauna that are unusual, spectacular, historically important, scientifically valuable, or unique, or that represent outstanding or rare examples of native species;
  • Preservation of water resources in their natural or traditional state, scenic areas or vistas, wildlife habitats, or fragile ecosystems;
  • Preservation of land for passive recreational use, such as hiking, photography or nature studies and, if specifically designated, bicycling, horseback riding, or fishing;
  • Preservation of agricultural uses and land suitable for agricultural production;
  • Utilization of land for shaping the development of the city, limiting urban sprawl and disciplining growth;
  • Utilization of non-urban land for spatial definition of urban areas;
  • Utilization of land to prevent encroachment on floodplains; and
  • Preservation of land for its aesthetic or passive recreational value and its contribution to the quality of life of the community.

Personal Service

Provides personal services for the convenience of the neighborhood, including, without limitation, hair salons, nail or skin care salons, tattoo parlors, dry cleaners, laundromats, bakeries, pharmacies, or automatic teller machines. These uses also include personal goods repair such as bicycle, watch, shoe, phone, or similar items, as well as alternative healthcare and wellness services not provided by a medical doctor or physician.

Places of Worship

Used for religious worship, assembly, educations and associated community activities.

Public Realm

All publicly owned, accessible spaces, including streets, sidewalks, paths, plazas, courtyards and urban outdoor public spaces which contribute to connectivity and enhance the aesthetic and social life in the community.

Recreation, Active

Indoor or outdoor recreation activities that are motorized or require specialized equipment or development of permanent facilities and infrastructure such as turf fields, pools, courts, gyms or parks.

Recreation, Passive

Non-motorized, outdoor recreation activities that offer mental and physical benefits, rely upon the natural setting as an integral part of the experience and require only minimal infrastructure and services. Examples include hiking, biking, rock climbing, nature study, horseback riding and fishing. Individual entities may have unique definitions and policies relevant to passive recreation that are specifically defined with departmental guidelines.

Research and Development

Includes product or process design, development, prototyping or testing, which may include laboratory, office, warehousing and light manufacturing functions in support of innovation-based industries.

Retail

Includes selling of goods or merchandise directly to the ultimate consumer and supporting uses such as sales, rentals and incidental servicing of products generally provided on the premises to consumers.

Transition Area

An area approximately one-half city block (150 feet) on either side of a boundary between Hub and/or Neighborhood class land use designations where either land use designation can apply when considering consistency with the comprehensive plan policies and future land use strategy. Transition Areas are not applicable to any boundaries with Systems or Special Purpose class land use designations.

Urban Agriculture

Small-scale agricultural production and/or animal husbandry within urban areas.

Utility Operations

Support public services such as water, wastewater, energy generation or transmission, communications and solid waste management.

Vehicle-Related

Associated with the sale, lease, fueling, charging, washing, servicing, or repair of vehicles, including automobiles, bicycles and micromobility devices.

Warehousing and Distribution

Primarily dedicated to the storage, handling and distribution of goods, materials or products, including fulfillment centers, logistics operations and associated loading and delivery functions.