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Starbase Avalon was originally designed by the Federation to serve multiple functions in Delta Quadrant and this is reflected in its unique deck layout. Engineering designers on Earth wanted to construct a station that could be posted for a long duration in both hostile and friendly territories, functioning as a host for embassies, a launch platform for response fighters, as accommodation for Federation citizens and as a mission specific facility, such as a planetary mining rig or a military outpost.

The upper decks of Avalon are where the command sections (CNC, briefing rooms and tactical planning) are located. It is where all the station's command decisions are made and implemented. The upper section of the station is also home to the fighter detachment, allowing for rapid defense of CNC and close communication between Fleet Control and the fighters. It is the most crucial section of the station, requiring the most power.

The next level is fitted with an eight modular saucer section, which houses the starship docking ring and docking tower. It is the largest deck section on the station and requires moderate power. It is also one of the most secure areas on the station with several high security checkpoints that must be passed before entering the civilian sections of the station. Its decks are also heavily reinforced to prevent damage to docked ships.

Located above and beneath the saucer section are the station's science and medical divisions. These two department make up the smallest sections of the station and have a central design, which allows for a rapid response time in case of an emergency. These sections are called the Bio-science districts and are made up of several decks of laboratories and med-labs. It also requires a large amount of power.

Security and the Promenade are located on the second saucer section (secondary habitat ring) and make up the mid-lower levels. Both Starfleet Security and Civilian Security are found on the Promenade and operate close to the residential district and commerce sectors. All civilian accommodation and military housing are located in the residential district. The bottom most decks, however, are reserved for Engineering, including the lower antenna sections and reactor core. Engineering is the most isolated section of the station for safety reasons, and allows engineers the freedom to conduct high risk work and not endanger the station's population. All these decks are highly reinforced, to also increases the station's protection.

 Positioned between the residential district and engineering department is the Multiple Support Module, a specialized starbase segment. Multiple Support Modules are created expressly for use aboard mission specific starbases and consists of a large removable module used for a single mission purposes. These can include medical aid, scientific analysis, and planetary mining. Individual or paired segments of the modules can be removed and replaced to suit the overall mission of the station. Avalon’s Support Module decks were dedicated to the mining of Erathia.
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Weapons Storage Area, Off-duty Lounges, CNC Auxiliary Batteries, Command Transport I, Environmental System Hub, Mini-Holodeck, Tractor Beam Emitters 1 - 10
Neural Net Division, Command Fusion Reactor, FTL Field Gauge
Main Computer Core and Control Center, Neural Net Sub-Division, Tactical Planning, Entry/Exit Airlock
Upper Sensor Grids, EPS Support, EPS Control Center, External Field Emitter
Shuttle Bays 1-20, Shuttlebay Service Area, Cargo Holding, Decontamination Area, Independent Traffic Control Station, Independent Shuttle Flight Operations
Probe Launching Facilities, Probe Storage, Data Laboratories, Probe Analyze Grid, Damaged Probe Repair Facilities
Flight Control, Strategic Command Center, Fighter Maintenance Floor
Primary Fighter Launch Bay, Pilot Ready Room, Pilot Locker Room
Fighter Pilots Temporary Sleeping Quarters, Power Transfer Conduits
Emergency Evacuation Facilities, Safety Shelter, Contingency Accommodations, Emergency Medi-Center, Secondary Medbay, Lifeboats
Summit Chamber, Conference Amphitheater, Embassy Complex, Diplomatic and VIP Quarters, High Security Check Point, Fusion Modules
Planetary Sciences, Geographic Laboratories, Archaeological Department, Geology Department, Hydroponics labs, Science Holding Bays
Science Probe Launch Facilities, Data Probe Storage, Data Probe Laboratories
Central Science Laboratories, Stellar Life Simulation Holodeck, High Energy Biophysics Chamber, Alien Biology Lab, Atmospheric Physics lab, Astrometrics lab

Central Phaser Arrays, Phaser Systems, Phaser Ring, EPS Node Outlet, EPS Processing, EPS Power Main Power Distribution Center

Power Distribution, Engineering Support Labs
Sensors Maintenance Control Center, Fusion Modules
Transporter Rooms 1-13, Emergency Medi-Center, Secondary Medbay, Computer Sub-Network, Armory, Contingency Accommodations
Captain's Cabin, First Officer's Quarters, Yeoman's Quarters, Local Generator Grid, Fire Suppression Systems
Senior Officers Quarters, Emergency Turbolifts, Off-duty Lounges, Fire Suppression Systems, Mess Hall
Command Transport II, Independent Security Bureau, Secondary Armory, Sub Security Check Point, Communications Relay Station I
Flight Command Center, Flight Staff Quarters, Emergency Turbolifts
Enlisted Crew Apartments, Fire Suppression Systems
Maintenance, Core Hull Pylon Conduits, Power Transfer Control
Merchant Cargo Stores, Weapon Storage Area, Security Checkpoint
Sound Buffers, EPS Support, Structural Integrity Field
Main Docking Bay, Docking Bay Doors, Merchant Shipping Yards, Private Civilian Marina, Cargo Transport/Loading Deck, Cargo Bays 1 - 20, Tractor Beam Emitters 11 - 20
Sound Buffers, EPS Support, Structural Integrity Field, Auxiliary Fusion Reactors
Docking Bay Door Control Center, Docking Bay Traffic Control Center, Tractor Beam Control Center, Deltuirm Module Emitter
Sickbay and Med-labs, Medical Officer's Office, Emergency Triage Ward, Counseling Center, Chief Counselor's Office, Psychiatric Rehabilitation Hospice
Transporter Rooms 14-25, Entry/Exit Airlock
Residential Apartments, Fire Suppression Systems
Shuttle Bay 21-30, Life Support Systems, Auxiliary Fusion Reactor, Life Support Matrix
Middle Sensor Grids, Environmental Systems Monitor, Mid-Primary Computer Network
Mid Level Gymnasiums, Botanical Gardens
Secondary Command and Control Center, External Docking Port, Emergency Batteries
Residential Apartments, Fire Suppression Systems
Recycling Center, Waste Extraction, Upper Reactant Power Loader
Residential Recreation Center, Holodecks 1-8, Upper Level Gymnasium, Public Swimming Pool, Public Cafeteria, Hoverball Courts
External Docking Ports, Communications Network
Photon Torpedo Storage Areas, Photon Torpedo Firing Units, Automated Targeting Systems Array, Photon Torpedo Storage Magazine
Battle Center Alpha, Inertial Dampening Systems
Engineering Support, Deuterium Tanks, Deuterium Control, Fill Drain Ports
Promenade Levels 1 - 4, Government and Public Offices, Station House, Chief of Security's Office, Brig, Promenade Precinct, Civilian Security Chief's Office
Holodecks 9-16, Power Transfer Conduits
Residential Apartments, Geological Extraction Offices, Planetary Sensor Manifolds
Residential Apartments, Fire Suppression Systems
Phaser Systems, Phaser Firing Ring, Phaser Ring. Auxiliary Fusion Reactor, Defensive Phaser Power Network,
Cargo Bays 21 - 40, Deuterium Injectors, Inertial Dampener Array
Shuttle Bays 31-35, Tractor Beam Emitters 21 - 30
Emergency Fighter Hanger, Fighter Repair Yard, Emergency Medi-Center, Alert Crew Bunks, Maintenance Contingency Quarters
Battle Center Sub-Section, Lower Sensor Grids, Lower Phaser Power Grid Controls, Targeting Protocol Arrays
Transporter Rooms 26-38, Structural Integrity Field Systems, Fusion Modules
Reinforced Storage Vault, Import/Export Liaison's Office, Cargo Operations, Cargo Processing Center, Work Bee Docking Ports
High Security Detention Center, High Security Check Point, Detention Watchtower, Deuterium Fuel Pumps and Fill Ports, Deuterium Fuel Storage
Deflector control, Deuterium Dish Injectors, EPS Node Monitoring
Consumables Storage, Entry/Exit Airlock, EPS Node Outlet
Matter Reactant Injectors, Magnetic Constriction Segments
EPS Support, Hull Pylon Conduits, Thruster Quads, Fusion Module Control
Main Engineering, Chief Engineer's Alcove, Emergency Trauma Center, Antimatter Ejection Controls, Dilithium Chamber Network, Shuttle Maintenance Yard
Matter/Antimatter Reaction Chamber, Antimatter Injection Reactor, Antimatter Reactant Injectors, Antimatter Storage Pods, Antimatter Ejection Sub-Systems
Impulse Thrusters, Impluse Fusion Reactors, Core Jettison Hatch
Navigation Computer, Nav-Net Matrix, Magnetic Constrictive Array, Magnetic Isolator Array, Manual Reactor Core Ejection, Sensors Maintenance Platform
Subspace Antennas, Auxiliary Sensor Arrays, Navigational Dish, Field Emitter Control
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