At 12:41 pm Saturday afternoon, Companies 20, 36 (Cardington-Stonehurst), Ladder 26 (Highland Park), and Medic 103-7 (DCMH), were dispatched to 320 Windermere Ave. for an odor of gas in the dwelling. Upon arrival of 20-9 (Chief Hoban), the homeowner advised the house was now filling with smoke. 20-9 investigated and found heavy smoke in the basement of the large, 3 story single home. The assignment was the upgraded to a working house fire, adding RIT 74 (Primos-Secane). Engine 20-1 (D/C M. Morgan) arrived moments later and stretched an 1 3/4″ handline through the rear door of the home and quickly knocked a fire in the basement. Engine 20-2 (A/C B. Tully) arrived and began assisting 20-1’s crew, as Squirt 36 and Ladder 26 arrived and began performing searches and ventilation on the upper floors. Ladder 20 also responded and assisted first-in crews with additional ventilation and overhaul. The fire was placed under control by the first 10 minute mark and scaled back to 20-1, 20-2, and Ladder 26 a short time later. The Company was in service for about 1 hour, returning to the Station around 1:40 pm. Traffic 20 and 8th Dist. Fire Police also assisted on the scene.