Hi all
I'm looking at a few houses in London for potential to redesign and renovate into something special for my family home.
The opportunities I'm interested in tend to look like:
Terraced/end terraced houses of 120-150sqm gia
Planning potential to expand by another 50-100sqm gia, either via a side or rear extension
In need of a full remodel - moving interior walls, evening out half-levels etc.
Sometimes an existing basement that could be finished into a utility/gym space -- or even expanded.
Opportunity for loft conversion, or a crappy existing loft conversion from 30 years ago.
I'm curious how to estimate the cost of works, so I can work out whether the numbers make sense. I want to achieve a great end result of > 200sqm, but want to be savvy about where to actually spend the money, especially because I have interior carpentry/fit-out/basic electrical skills and am very "handy". Success looks like a well-crafted finish, but not necessarily expensive materials. I feel confident that the fit-out could be done on a budget, but the exterior and structural work is outside my comfort zone.
We've consulted a few architects, who are going by an ex-vat "rule of thumb" of £5000/sqm for extension, and £3000/sqm for interior remodel, excluding any savings from my labour.
These costs seem extraordinarily high to me -- it would mean costs of at least £1M - way more than the finished property would be worth!
I'm wondering:
Are these costs just what the real world looks like in London, 2024?
How do major costs tend to break down between (1) the building shell, (2) interior "core" reconfiguration and (3) the interior fit-out?
How much can be saved by handling a lot of the interior fit-out myself (kitchen, laying flooring, carpentry etc.)? I have experience in these areas and have time to hire and project manage specialist trades.
If anyone has advice, I'd be very appreciative!