Thank you roj leather and Simon for your recommendations. I like the hanging chair and the almanda creeper on the wall. This will certainly liven up the patio.

Since the lot you describe is smaller than my open living area, I would suggest looking at some of the "shotgun" house plans around New Orleans,LA. I think you can build up and back and get an interesting home with a loft for space. It can be done, A porch with an entry to a narrow hall at the back might work best for you. Will you plan a courtyard (closed)? or what? What part of the country are you in? What are your local codes?

Yes, as Cornerstone says, please don't redo the water-proofing if it has already been done once. Tiles are a far better option than decking with composed fibre-wood. No matter how hardy the latter material is, it is going to be a muddy and wet area, so please go with a good anti skid ceramic tile. Check on the final use with the manufacturer- that it is going to be laid on the terrace and exposed to sun. Use at least 3 mm spacers to allow for some expansion over a period of time. Also leaves enough space to insert waterproofing epoxy and secure the tiles

Jeco, Price variations do often confuse a home owners. Going a bit off topic, often we have to politely say no to clients who are looking for a fixed cost on day 1. The design evolves over a period. Pricing is extremely sensitive to location and materials selected. For example there are materials that would start from 60 sft to 1000 sft which can be used for this external construction. Unless that material is specified it is difficult to pindown the price. Having said that it should be in the range of 2-5 lakhs in Bangalore. This idea definitely looks good but have you considered that this is a terrace sit out and design and the requirements of porch are completely different. For example you may not want rain water to fall on the cars underneath ? Thanks, Nitin Cornerstone Designs, Bangalore.