Yes, in 2026, parking in the Royal Borough of Kensington and Chelsea (RBKC) is generally free on Sundays in "Pay-by-Phone" (metered) bays and on single yellow lines. Most controlled parking zones in Kensington operate from Monday to Saturday, meaning you do not have to pay for a visitor session on a Sunday. However, it is critical to note that Resident Permit Bays are often still restricted 24/7 or have specific Sunday hours in high-demand areas like Kensington High Street or near the South Kensington museums. Furthermore, double yellow lines and "Restricted Zones" remain enforceable every day of the year. Always check the nearest street sign or use the RingGo app to confirm the specific restrictions for the exact bay where you are parking, as Kensington is notorious for its strict enforcement and high fines for even minor oversights.