Since 2020, building a home in the UK has got significantly more expensive. Timber, steel, insulation, labour — all of it has climbed. Clients aren't wrong to be cautious. But the traditional way of pricing construction projects makes the problem worse, not better. Here's why open-book construction management is the only honest answer for projects in Chester, North Wales, and the North West right now.
The cost landscape has changed dramatically
Let's be straightforward about what's happened. Material prices have been volatile in a way the industry hasn't seen for a generation. Structural timber at points doubled. Steel went through the roof. Insulation products — critical for extensions and renovations — saw supply shocks that sent costs spiralling. Labour has tightened too, and tradespeople know their worth.
None of that is going back to 2019 levels. Clients planning extensions, renovations, or barn conversions today are working with a completely different cost baseline. And they are, understandably, watching every pound.
Fixed-price contracts don't protect you — they bill you upfront for risk
Here's how fixed-price construction contracts work in practice. The builder prices the job. Then he adds a buffer. That buffer covers material price rises, supply delays, anything unexpected on site — all the things that might eat into his margin.
That buffer isn't small. In today's market, with costs as volatile as they are, a competent builder is loading 15–20% on top of his real expected cost. Sometimes more. He has to. He's taken on the risk of everything that could go wrong between signing and practical completion.
"That buffer comes out of your pocket — whether the risk materialises or not."
If the job runs smoothly, if steel comes in at the price he expected, if the groundworks go without a hitch — he keeps the difference. You'll never see it. You'll never even know it was there. That's how the model works. It's not dishonest, exactly. But it's not transparent either.
On a project that swings £20–30k based on material costs alone — and in today's market, that's not unusual for a significant extension or renovation — that hidden contingency is real money.
When the builder stops worrying about margin, the build gets better
There's something else that happens under a fixed-price contract that nobody talks about. The builder's energy goes into protecting himself. Every decision on site — which subcontractor to use, which materials to specify, whether to flag a potential issue early — is filtered through the question of what it does to his margin.
That's not the builder's fault. It's the structure of the contract. But it means his focus is in entirely the wrong place.
With open-book construction management, that changes completely. There's no margin to protect. The costs are what they are. If steel comes in cheaper than expected, the client pays less — it's not the builder's windfall. If a subcontractor quoted low and comes back with a higher number, the client knows immediately.
The builder's energy goes where it should: the quality of the build, the programme, the coordination of trades, the decisions that make a project genuinely good. That's what construction project management is supposed to look like.
Transparency isn't a nice-to-have anymore
A few years ago, you could argue that open-book was a preference — a nice idea in theory but not essential if you trusted your builder. That argument doesn't hold up in today's market.
When a project can legitimately swing £20–30k on material costs alone, you need to know what's actually happening. You need to see the invoices. You need to know whether a cost increase is real or whether someone is capitalising on market uncertainty to recover a margin they were always hoping to find.
Clients in Chester, North Wales, and across the North West are asking harder questions than they were five years ago. They should be. Open-book construction gives them the answers. It's why so many homeowners searching for builders in Cheshire end up choosing open-book over fixed-price the moment they understand what's actually inside a padded quote.
The Built Clear model — no guesswork, no games
The way Built Clear works is straightforward. Three numbers, all of them visible:
- A guide price from your plans. Before we start on site, we price the project from your drawings — a realistic, honest cost expectation based on what it will actually take to build. Not padded to cover a contingency you'll never see.
- A fixed project management fee. One agreed fee to run the entire project: programming the works, coordinating merchants and subcontractors, quality oversight, and keeping you fully informed. It's agreed upfront. It doesn't move. Benjamin's cost to you is clear from day one.
- A fair 10% on all costs. Every invoice from a merchant or subcontractor passes to you at exactly what we pay, plus a transparent 10%. That covers our overheads and profit. Nothing buried. Nothing doubled up.
Everything is visible on Buildertrend in real time. You can see the programme, review invoices as they come in, and message the team directly — from your phone, at any time. Whether you're on site in Chester every day or managing a renovation in North Wales from a distance, you always know exactly where your money is going.
The builder's incentive finally aligns with yours
This is what it comes down to. Under a fixed-price contract, a builder who delivers the job quickly and cheaply wins. You get what the contract says — no more. Under open-book construction management, a builder who does the job well, sources materials intelligently, and runs a tight programme saves the client money. That's the outcome both sides should want.
In a market where every penny counts, the last thing you need is a structure that puts your builder's interests in opposition to yours. Open-book removes that conflict entirely. The book stays open. The costs are real. And the builder's job — finally — is just to build well.