An attempt has been made to develop the one centimeter precision regional quasi-geoid model for transformation of the ellipsoidal GNSS height, h, to the standard height, H. For this purpose the densification of the GNSS/levelling point regional network has been performed in Latvia. Differential GNSS processing strategy, IGS/EPN reference station network and Helmert transformation 7 parameter method used to reduce the daily results of Latvian continuously operating station network to the ETRS89 fixed epoch. The same Helmert transformation 7 parameters are applied for the corresponding date GNSS/levelling point ellipsoidal height reduction to the same fixed epoch in order to avoid the daily unresolved network deformations. The new geoid model based on LAS-2000,5 normal height system, ellipsoidal heights and global gravimetric models (EGG97 and EGM2008) was computed using DFHRS v 4.0 software.