This study investigated the effects of different fire retardant chemicals on surface and thermal properties of veneer sheets. Beech (Tagus orientalis). alder (Alnus glutinosa), poplar (Populus deltoides) and scots pine (Pious sylvestris) were chosen as wood species and zinc borate, borax. monoammonium phosphate and ammonium sulfate were chosen as fire retardant chemicals. The samples were impregnated by using the immersion method. Some surface properties such as colour measurements and surface roughness of the veneer sheets were conducted according to CIE L*a*b* system. Some thermal properties such as thermal conductivity of the veneer sheets were conducted according to standard and weight loss after combustion was determined by thermogravimetric analysis. Conforming to the results from the study, it was found that fire retardant chemicals increased the thermal conductivity and surface roughness of veneer sheets. Also, thermogravimetric analysis experiments showed that all of the fire retardant chemicals decreased the loss in weights.