There are plenty of tables that extend without a drop leaf. In one style (usually more modern) the extension slips under the rest of the table with a spring mechanism, making the table surface look like it has a double thickness when you aren't using it. In the other style (usually more traditional) there are leaves that can be put into the table. The latter takes more work to assemble each time you want to extend.

I agree, they have great styles to choose from and their website is so easy to use

Here you go.. Iron Man: https://www.amazon.in/3DlightFX-Iron-Mask-Deco-Light/dp/B00WUDSS4K/ref=pd_sbs_21_3?_encoding=UTF8&psc=1&refRID=66JPRHWGBQV4W76YX6TW&tag=csds0c-20 Captain America: https://www.amazon.in/3D-Deco-Light-Captain-Childrens/dp/B00DDHDDCO/ref=pd_sbs_21_1?_encoding=UTF8&psc=1&refRID=66JPRHWGBQV4W76YX6TW&tag=csds0c-20 Spiderman: https://www.amazon.in/LIGHT-Spider-Man-Spider-Light-MARVEL/dp/B00GKMHIDO/ref=sr_1_1?s=toys&ie=UTF8&qid=1505934989&sr=1-1&keywords=spiderman+deco+light&tag=csds0c-20 Thor hammer: https://www.amazon.in/Avengers-Light-Hammer-Decoration-Mount/dp/B00JXFU4MW/ref=pd_sbs_21_4?_encoding=UTF8&psc=1&refRID=66JPRHWGBQV4W76YX6TW&tag=csds0c-20 Hulk: https://www.amazon.in/3D-Deco-Light-Hulk-Childrens/dp/B00DDGYXHE/ref=pd_sbs_21_2?_encoding=UTF8&psc=1&refRID=66JPRHWGBQV4W76YX6TW&tag=csds0c-20 Thanks, Amit Cornerstone Designs Bangalore.

The local contractor working in your area will know all about the extensions permissible by DDA. You just need to match the exteriors with the existing elevation of the building.