Well, that sounds like you just have a Inn Room at the Moment. The only way to increase of 30 slots is by getting ESO Plus. With ESO Plus you get double Housespace, Bankspace ect. Also, if you buy bigger Houses it will increase in this Houses
Council Member of AtWritsEnd, Member of LoneWolfeHelp, Donor of GhostSeaTradingCO., Factor of EastEmpireTradingCO.,HonourGuard of ´DominionImperialGuard(DIG/PVP)
Master Crafter including Jewelry, i craft for Mats and Donation, always happy to help, if Im not in the Middle of PVP, i play since around 14 Months
Lighting is a big problem in housing taking up many slots especially in a big house. If you use varla stones they can light 2 whole floors of a house even if hidden in walls so you don't have to use so many sconces/chandeliers
You can buy ESO plus for a month and decorate your double space house.
When ESO plus will expire, items will still be in the house, no one will take them away, but you won't be able to put new one if you take away something