It depends what deals are on at the time. Last three or four jobs I've worked on full fill Superwall slabs were very good value. With lightweight inner blocks this gives you a U-value of about 0.30 or with medium density blocks a U-value of about 0.32. If you want to crank the U-value up to 0.28 go for an aerated inner block.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local