Although it would be cool for the interior and exterior to be one instance where you can peer out your window, by having separate instances you can do some interesting interesting interior design without having furnishings clipping outside of the home.
Lots of players have made a secondary floor on the top level with staircases and platforms.
It would be more difficult to do stuff like this if it was all one instance.
Gear: 5 Infallible Aether (All apparel light and Divines with Max Mag Enchants), 1 Slimecraw Guise for max spell critical (Divines, light, Max Mag Enchants), Maelstrom's Perfected Inferno/Lightning Staff (infused/shock enchant), and Rage of the Ursauk jewelry (bloodthirsty with spell damage enchant)/lightning staff (infused/flame/weapon damage enchant). 1 Mora's Whispers.
Ability-Bar 1: Critical Surge, Boundless Storm, Mages' Wrath, Lightning Flood, Twilight Tormentor (Twilight Matriarch for solo roleplay variant of build), and Power Overload.
Ability-Bar 2: Crushing Shock/Storm Pulsar, Streak, Flame/Shock Reach, Unstable Wall of Fire/Storms, Twilight Tormentor (Twilight Matriarch for solo roleplay variant of build) and Fiery/Thunderous Rage.
Gear: 5 Spell Power Cure (All apparel light and Divines with Max Mag Enchants), 1 Slimecraw Guise for max spell critical (Divines, light, Max Mag Enchants), Maelstrom's Perfected Lightning Staff (Charged/shock enchant), and Infallible Aether jewelry (arcane with spell damage enchant)/restoration staff (Powered with absorb magicka enchant). 1 Mora's Whispers.
Ability-Bar 1: Power Surge, Boundless Storm, Blessing of Restoration, Energy Orb, Twilight Matriarch, and Replenishing Barrier.
Ability-Bar 2: Dark Deal, Overflowing Altar, Elemental Drain, Blockade of Storms, Twilight Matriarch, and Aggressive Horn.
My Meme Tank Build that uses high resistance and variety of wards.
Gear: 5 Brands of Imperium (All body pieces except Head and Shoulders, with Divine trait, and with Prismatic Defense Enchants), full Mother Ciannait's (1 light and 1 medium. Divines and Max Mag Enchant), and Combat Physician jewelry (bloodthirsty with Prismatic Recovery Enchants), CP restoration staff (Infused with hardening enchant), and CP ice staff (Infused with crusher enchant).
Ability-Bar 1: Critical Surge, Bound Aegis, Deep Thoughts, Boundless Storm, Healing Ward, and Replenishing Barrier.
Ability-Bar 2: Silver Leash (Elemental Drain if healer isn't running it), Bound Aegis, Frost Clench, Blockade of Frost, Empowered Ward, and Temporal Guard.
Tanky stage 4 vampire utility focused PvP healer that can take down very inexperienced players but is primarily focused on working alongside others in an organized group, PUGs, or zergs.
Gear: 5 Torug's Pact for regular and NoCP build/Oblivion's Foe for dot build (medium chest and body pieces light. All Impenetrable. Max Mag Enchants). Gaze of Sithis and 1 light Mighty Chudan/Pirate Skeleton (light shoulders, and impenetrable with Max Mag Enchants). Knight Slayer/Pariah jewelry/Plaguebreak for dot build (bloodthirsty with spell damage enchant)/lightning staff (infused with oblivion enchant for regular and noCP build/absorb magicka enchant and Sharpened for dot build. Sharpened for dot build)/restoration staff (infused with oblivion enchant regular and noCP build/absorb magicka enchant and Sharpened for dot build).
Ability-Bar 1: Structured Entropy, Boundless Storm, Soul Splitting Trap, Radiating Regeneration, Healing Ward, and Life Giver.
Ability-Bar 2: Drain Vigor (Elemental Susceptibility), Race Against Time, Rune Cage, Radiant Magelight, Empowered Ward, and Shatter Soul.
My casual one bar heavy attack Templar build that only utilizes Aedric Spear abilities.
Gear: 5 Infallible Aether (Head or Shoulder and body pieces except Chest. All body pieces Divines with Max Mag Enchants), 1 Slimecraw Guise for max spell critical (Divines, light, Max Mag Enchant), Lightning Staff of the Sergeant (Infused/shock enchant), and Sergeant's Mail jewelry (One Ring and one Neck. Both bloodthirsty with spell damage enchant). 1 Oakensoul Ring (bloodthirsty with spell damage enchant).
Tanky stage 4 vampire utility focused PvP healer that can take down very inexperienced players but is primarily focused on working alongside others in an organized group, PUGs, or zergs.
Gear: 5 Torug's Pact (Heavy Chest with light Head, Waist, Hands, and Feet. All body pieces Impenetrable. Health enchant on head and everything else Magicka Enchants), 1 Medium Mighty Chudan/Pirate Skeleton Shoulder (Impenetrable, Max Health Enchant), Knight Slayer Restoration Staff (Infused/Decrease Health enchant/Stealth-Draining Poison IX), and Knight Slayer jewelry (One Ring and one Neck. Both bloodthirsty with spell damage enchant). 1 Oakensoul Ring (bloodthirsty with Spell Damage Enchant).
Ability-Bar 1:Radiant Oppression, Race Against Time, Aurora Javelin, Breath of Life, Resolving Vigor, and Life Giver (Shatter Soul).
Gear: 5 Law of Julianos (heavy chest, gloves/belt light, and the rest can be light or 1 medium piece if you're not wearing medium anywhere else on your body. All in training if grinding for XP or divines), Armor of the Seducer or Magnus' Gift head, shoulder, and staves (light with 1 medium piece if you are not already wearing 1 medium Julianos piece. All in training or divines. The staves should be training or infused), and 3 purple Willpower Jewelry with Arcane trait (can be bought from trading guilds for relatively cheap.
Check tamrieltradecentre.com for the best deals if you're not using a price checking addon).
Parse Food for PvE:(DPS) Ghastly Eye Bowl (increases Max Magicka by 4592 and Magicka Recovery by 459 for 2 hours).
Gold/Purple Food for Sorc PvP and Meme Tanking:(PvP) Clockwork Citrus Filet (increases Max Health by 3326, Health Recovery by 406 [useful if stage 1 vampire], Max Magicka by 3080, and Magicka Recovery by 338 for 2 hours). Witchmother's Potent Brew (Increase Max Magicka by 2856, Max Health by 3094, and Magicka Recovery by 315 for 2 hours.
Trash Potions when feeling cheap: Regular CP150 Essence of Magicka pots that I obtain frequently from playing the game or Crown Tri-Restoration Potion obtained from dailies.
Crafted Potions: Essence of Spell Critical (Bugloss, Lady's Smock, and Water Hyacinth). Without magelight this is my primary means of obtaining Major Prophecy on my Sorc, which increases my Spell Critical Rating. This also heals and restores magicka. Essence of Immovability (Columbine, Corn Flower, and Wormwood). I use this in PvP, since this gives me stealth detection, knockback immunity, and restores magicka (better to use it when competent allies are nearby, since it might reveal that you are surrounded by multiple players in stealth and you will not have an emergency pot available after use). Essence of Invisibility with only 2 ingredients (Blue Entoloma, Namira's Rot, Nirnroot, or Spider Egg). I use this in PvE content that requires stealth and if I need more speed I'll use Rapid Maneuver before using the potion. Essence of Invisibility with 3 ingredients (Blessed Thistle, Blue Entoloma, and Namira's Rot). Very useful in PvP alongside the vampire Dark Stalker passive, since you'll be invisible, ignore movement speed penalty while in Crouch, and you'll have a 30% movement speed boost from Major Expedition (I always have this slotted when riding from point A to B in PvP land, since gankers are always lurking). My templar will mostly use Essence of Health (Tri-Stat Potion) Ingredients: (Mountain Flower, Columbine, and Bugloss).