Timber, as a sustainable and versatile construction material, has been widely used for centuries in building structures. Its natural aesthetic appeal, ease of use, and environmental benefits have made it increasingly popular in modern construction. However, a critical aspect of timber structures is their fire resistance. Wood is a combustible material, but it has certain desirable properties in terms of reaction to fire due to the charring of the outer layer, which serves as an insulator against heat penetration to the core of cross section. The focus of this research is the fire resistance of timber elements and the effect of changing the dimensions of the cross-sections on the fire resistance of these elements. This research has a quantitative approach in exploring the fire resistance of timber structures. The results found through the calculations and presented in diagrams show that the bigger the cross-section the greater the fire resistance for both beams and columns. The results also show the importance of the cross-sectional dimensions of timber elements, as well as the moment of inertia, especially for beams, in considering the fire resistance of timber elements.