The last year must have slowed down progress for the building trade. My son is in the construction business and whilst they could continue to build, many employees were furloughed.
The article makes no reference to whether the private developers are ones that buy plots to build in excess of 5 houses, or they are single plot developers, who leave them as phantom homes.
There is another reason as to why land is being left undeveloped. I came across this quote today: “The issue of planning permissions not being built out is certainly not as simple as housebuilders sitting on sites,” said Jonathan Dyke Bsc Hons MRICS – Strategic Land Director – IM Land. “There are various things that can prevent consented sites being built on – such as viability and other economic issues such as existing use values and the cost of relocating businesses to unlock and assemble sites.
However, for whatever reason, a review is needed. I don't want to see sites not being used and developers thinking they will get more for the land by building phantom homes but if there are restrictions stopping a build from happening that has to be addressed too.
If your last sentence varian were to be enforced for all builds, it could seriously affect a self build project, of which there are growing amount in the UK. MrM and myself have such a project. We got our planning permission in 2015. We hope to move into our new home, after it's signed off, at the end of this year having completed 30% of the work ourselves. We gave ourselves 2 years but self builds have a mind of their own. Most stressful job I've ever had being the project manager. The 3 year rule is to start a build. It doesn't have to be finished and signed off before the end of the 3 years.
I don't see how it is possible to remove planning permission once a build is under construction. It isn't so much a change to all planning applications but more to the conditions of the planning consent. The three year rule could remain but for larger developments, perhaps a condition about time to complete and signing off. Penalty clause?
Section 106 agreements don't apply to single or small developments.