Under most circumstances, no. A legal right to light is most commonly gained by enjoying light continuously for 20 years. Properties that are less than 20 years of age will not normally have a right to light, unless you can demonstrate you have a right to light by other means. This could be by having an express right granted in your property deeds, or, you may have an implied right due to a transactional sale of land. If your property stands in place of an old building that did previously have a right to light (but was demolished), and the new windows are positioned in the same location as the old ones, the old right to light may have transferred to your new property.