Jon LovetteYou've purchased what you thought was your dream home, but after a few years, you've realized you need a little more space. What can you do? Before you call your real estate agent, consider building an addition to your existing home. While a renovation may be costly, it will save you the hassle of movingand it can help you keep a low mortgage interest rate.Whether you just need an extra bedroom, some more living space, or a full in-law suite, there's likely an addition that can work with your home's layout and your budget. Plus, a home addition can be a worthwhile investment and boost your home's value if you do decide to sell down the road. Here are nine types of home additions to consider, as well as pricing estimates for each.Everything homeowners need to know:1Room Addition (Bump-Out)Jon LovetteCost Estimate: $10,000 to $50,000+Best for: Just about anyoneA room addition, often called a bump-out, involves building a new room attached to your existing layout or expanding an existing room. For instance, you might add a den or guest bedroom to your ground floor or you might expand your kitchen by just a few feet to add a breakfast nook. This type of addition is perfect for homeowners who need just a little extra space in their homeand have room on their lot to add it. Pricing depends on the size of the addition and whether or not you're adding plumbing to itplumbing always raises the price.2SunroomALI HARPERCost Estimate: $5,000 to $80,000+Best for: Plant lovers and sun worshippersA sunroom is a versatile, light-filled space that brings the outdoors in without exposure to the elements. These rooms typically feature large windows and can be used year-round if properly insulated. Of course, a four-season sunroom will cost more than a three-season sunroom, thanks to that additional insulation. One of the most cost-effective ways to add a sunroom to your home is to build it atop an existing deck, provided the deck is structurally sound enough to support it.Advertisement - Continue Reading Below3Garage ConversionBrie WilliamsCost Estimate: $6,000 to $30,000+Best for: Budget-conscious homeownersIf you have a garage that you rarely use for parking, consider converting it into a space that suits your needs. Garages are popularly turned into home gyms, game rooms, or workshops, but if you properly insulate the spaceand get the correct permits for ityou could even convert it into an in-law suite. The best thing about a garage conversion is that it doesn't change the layout of your home, so costs can be kept fairly low. Plus, the renovation doesn't need to completely disrupt your day-to-day life, since it'll be contained to the garage.4Over-Garage AdditionStacy Zarin GoldbergCost Estimate: $10,000 to $40,000+Best for: Homeowners with small lotsDepending on the layout of your home, adding a room over your garage is one way to increase space without adding to your home's overall footprint. This room can be used as a guest suite, home office, or potentially even a rental unit, if your local code allows. Just keep in mind that you'll want to add good insulation all aroundgarages aren't typically well insulated, which means that over-garage rooms can be difficult to heat or cool.Advertisement - Continue Reading Below5Finished BasementChris EdwardsCost Estimate: $4,000 to $75,000+Best for: Homeowners looking to increase property valueIf you already have a basement, but it's not finished, remodeling the space to become livable is one way to significantly boost your home's valueand you can often do it on a budget, too. Turn an underutilized space into a functional area, such as a playroom, home theater, or home office, by adding flooring, drywall, and a drop ceiling. To add a bedroom in the basement, you'll need to make sure there's an exterior door or an egress window in the space.Related Story: How Much Does It Cost to Finish a Basement?6Attic ConversionLaure JolietCost Estimate: $7,500 to $35,000+Best for: Growing families on a budgetDon't have the budget for a full second-story addition? Don't worry. You might have another option. Depending on the style of attic your home already has, you might be able to convert that unused space into something much more practicalsay, an extra bedroom, a home office, or the walk-in closet of your dreams. What's realistically possible all comes down to what your attic space is like, so call up a contractor for an inspection to find out your options.Advertisement - Continue Reading Below7Accessory Dwelling Unit (ADU)onurdongel//Getty ImagesCost Estimate: $60,000 to $300,000+Best for: Those with lots of guests, whether long-term or short-termAn accessory dwelling unit (ADU) is a self-contained living space that's distinct from the primary house on your lot. It can be built as a separate structure, such as a guest house, or as an addition to your existing home, like an in-law suite. But the real key here is that they're self-contained, which means they have a kitchen and bathroom, in addition to a living/sleeping space. Many homeowners use ADUs for rentals or long-term guests, like elderly parents.Related Story: 14 Prefab Tiny Homes That Are So Easy to Install8Conventional AdditionEmily FollowillCost Estimate: $50,000 to $500,000+Best for: Those committed to staying put in their homeA conventional addition typically involves significantly increasing your home's footprint by adding multiple rooms or even entire wings. This type of addition can include new bedrooms, bathrooms, and living spaces, and they can be seamlessly connected to the main house or kept separate as an in-law suite. To build a conventional additional, you'll need lots of room on your lotand a hefty budget. A major cost of this type of addition is the foundation, so the more square feet you add, the more you'll be spending on your foundation.Advertisement - Continue Reading Below9Second-Story AdditionDan Reynolds Photography//Getty ImagesCost Estimate: $100,000 to $300,000+Best for: Growing familiesFor homes with limited lot space, a second-story addition can double your living areabut it'll cost you. This major renovation requires structural reinforcement, and that's often very expensive. That said, all the extra space might be worth it for a growing family that needs an additional bedroom or two with room for an extra bath left over. To save some money, you can also consider just adding a single room on the second floor rather than multiple, depending on your home's layout.