A double layer coating was designed and fabricated on glass surfaces by sol-gel method using a silica-titania (SiO₂–TiO₂) thin film as the bottom layer and an inorganic-organic (triethoxy(octyl)silane (OTES) modified SiO₂) upper layer. SiO₂ and TiO₂ sols were prepared using tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TIP) as precursors and nitric acid (HNO₃) as catalyst. The refractive index of the SiO₂–TiO₂ and OTES modified SiO₂ layers were 1.79 and 1.45, and their thicknesses were approximately 76.8 nm and 94.2 nm, respectively. The results show an increase of 7% in transmittance respect to the uncoated glass substrate. At the same time, OTES-modified SiO₂ top layer significantly improved the hydrophobicity of the system; the water contact angle of film increased from 56° for system without the OTES modified SiO₂ layer to 102° for the system with OTES-modified SiO₂ top layer.