If only the terrace becomes a balcony, the price difference will not be too big.
If it is a large area, the price of steel structure is more advantageous. Special covered electrode is needed for on-site welding of aluminum alloy, which is not always possible for general welders.
Advantages of Aowei aluminum alloy doors and windows sun room: no rust, good thermal insulation, convenient construction, various forms and orderly drainage; Disadvantages: the relative price is relatively high, because the strength of aluminum is never comparable to that of steel.
Advantages of steel structure sun room: steel structure sun room has no restrictions on creativity, size and shape; Disadvantages: steel will rust and have poor thermal insulation.