Interesting. Is that because of nimbyism and opposing pressure for the developments to go ahead at all?
Forgive me for not crying a river for these developers profiting from what they call houses. From my perspective and experience, a lot of new builds are dog **** in quality and layout of the estates are poor. Houses are crammed in and knocked up quickly to maximise profit. Tiny rear gardens all overlooked. Minimal front gardens and a massive lack of drive space/parking. Lovely brick built roads are too narrow and get littered with cars and work vans along the entire roads around the estates. I know someone close to me who just bought a brand new 700k house. All 3 of the bathrooms had major leaks causing damage, as did many others down the same road. Several other issues. To be expected? Only because we accept this BS in the UK when our rip off houses get signed off as adequate.
Seen the Welsh guy on tiktok/youtube who does snagging? "Absolutely shocking" is his catchphrase. The guy finds some incredible stuff. Structurally lethal stuff. Absolute shambles.
There is no pride in workmanship anymore in many things in the UK. It's all about getting the job done as quick as possible to a level deemed adequate and then laugh all the way to the bank.
There is more to it than just the builders trying to maximise profits, though the quality of new builds can be laid at their feet, the cost of land can sometimes dictate construction method in order to make projects viable - but obviously there's no excuse for poor quality and poor handling of snagging.
Also worth thinking about the banks in all this - they will approve your mortgage based on the market value for a property - they won't really care if it's a proper brick built home, or if it has a timber frame, so if a "properly" built house increases the cost by say 20% that doesn't necessarily mean that buyers can afford the premium. "Premium" quality homes are built in the UK - typically by smaller firms, but those aren't normally your typical 3 bed semi, there more in the "executive" homes type space, there are obviously exceptions though.
On the roads, parking and small garden front - developers do not share all the blame here. Local planning departments have a big role in this aspect - but again there are exceptions where the builder is trying to maximise the density and cost of a development. Again the lenders also have an influence here - when agreeing a mortgage those focus on the size of the house - not so much on the parking/road/garden.
There are some big house builders laughing all the way to the bank - but there are lot of firms that aren't. Doing a big development is a risky venture, unless you can sell a large percentage of the homes off plan before you start incurring significant build, material and land costs - cashflow is a serious issue for many firms, which is probably only going to get worse over the next few years due to inflationary pressure on building materials, lack of trained staff due to Brexit/cost of living - both increasing labour costs, and, an increase in the costs to borrow the money needed to get a development through to completion thanks to the interest rate rises.
It's easy to dislike developers - and a lot of them really do deserve it. But like most things - there's often a lot more to it than meets the eye.