is building a room in the attic in crease the value of my home>

[Jezreel Tena]

I'm a small investor in the DFW area i'm in the process of remodeling my bathrooms and considering adding a room with a bathroom in the attic of  or in the garage space. just need to know witch one adds more value to the property so i can refinance at a higher price. thank you all who took the time to reed this and help me out.