The Barn — 4:5Full structural remodel, garden room and a new first floor.

Holt & Co. — Design & Build, Surrey
Full renovations, extensions and remodels across Surrey and south-west London. One team from first sketch to final snag.
See a transformation



Week 0
Cobham — a six-bedroom family house that had not been touched since 1978.
Week 11
The whole back of the house open to the weather for nine days. This is the part nobody photographs.
Week 26
Ceiling raised, rear elevation fully glazed. Six months, on budget.
Keep scrolling
Recent work
Every one of these was lived in again within a week of handover. No snagging lists running into the following spring.
The Barn — 4:5Full structural remodel, garden room and a new first floor.
Riverside House — 4:5Kitchen, orangery and a principal suite carved out of the loft.
Elm Villa — 4:5A Victorian villa split into flats, returned to one family home.
Founder portrait, on site — 4:5
Who you'll be dealing with
I trained as a carpenter, ran sites for fifteen years, and watched the same thing happen on nearly every job — a client signs off a design, then spends six months chasing people for answers.
Holt & Co. runs differently. You get one point of contact, a fixed price before we lift a tool, and a weekly update with photographs whether there is good news or not. Twelve of our trades are in-house, so when something needs fixing we are not waiting on somebody else's diary.
180+
Homes transformed
18
Years on site
9.8
Average client rating
12
Trades in-house
How it works
You will know the final figure before the first wall comes down, and you will know what is happening every Friday until we hand the keys back.
Stage 01
Two hours at your house, walking the space and talking about how you actually live in it.
Stage 02
Drawings, 3D visuals and a fixed price broken down line by line. Nothing is hidden in a contingency.
Stage 03
One site manager, in-house trades, and a photographed progress report every Friday afternoon.
Stage 04
Deep clean, full snagging walk-through and a two-year workmanship guarantee in writing.
They handed the house back three days early, and cleaner than they found it.
Start here
Free, no obligation, and roughly two hours. We will tell you honestly whether what you want is worth doing before anyone talks about money.
Nettorra showcase — 02
No video, no heavy library — three aerial stills and a few lines of CSS. It works on a phone, and it loads in under a second. Placeholder blocks swap for your own photos.