What a builder knows that most villa owners don't

Key points

A contractor's bid is a commercial strategy, not just a cost estimate: the margin is often planned in the gaps, not in the headline.
Provisional sums, preliminaries and variation rates are where an apparently cheap bid becomes an expensive project.
Programme float belongs to whoever the contract says it belongs to, and that decides who pays for delay.
A monthly valuation should be read line by line against work actually installed, not approved as a total.
Your leverage peaks before handover and falls sharply once you have the keys and the retention is released.

A builder knows that the price you sign is a starting point, that the margin on a job is often planned in the gaps rather than the headline, and that most owners never read the documents where those gaps sit. Provisional sums, preliminaries, variation rates, programme float and the monthly valuation are where a villa's real cost is decided. We spent 21 years on the contractor's side of premium residential building in the UK, and this is what we would want any owner to know before signing.

Nothing here is a criticism of contractors. Building is a hard, risky business with thin margins, and a good contractor is worth paying properly. But the commercial logic of the contractor's side is not the owner's logic, and the owner who understands it gets a better building for less trouble.

How does a contractor actually price a villa bid?

Owners imagine a contractor adds up materials and labour, puts a margin on top, and sends the number. That is the estimate. The bid is something else.

On the contractor's side, the first thing any builder prices is not the building. It is the risk in the documents. How complete was the design? Which items were vague? What was missing from the drawings that would obviously have to be built? Where would the client inevitably change their mind? Those answers decide how a contractor bids.

When the design is complete and the competition strong, contractors price tight, because there is little to recover later. When the design is loose, the market can afford to bid lower, because everyone knows the job will grow. That is the uncomfortable truth: an incomplete design does not just add risk, it invites a lower bid, which looks like good news to the owner and is often the opposite.

Contractors also price the client. A first-time owner who lives overseas, with no independent adviser, is a different commercial proposition from an experienced developer with a quantity surveyor checking every valuation. Nobody writes that on the bid, but it is in the number.

Then there is the subcontract market. Much of a villa is built by specialist subcontractors: MEP, glazing, joinery, stone, pools. The main contractor's bid depends on quotes from them, and those quotes can be sharpened after the main contract is signed. Savings found after signature are the contractor's to keep unless the contract says otherwise.

Quay House, St Mawes, Cornwall. Built by P Chapman Construction.

What are provisional sums, and why do they matter so much?

A provisional sum is an allowance for something not yet designed or chosen. "Kitchen: AED X." "Lighting control: AED Y." When the actual item is selected, the contract sum moves to the real cost.

From the builder's side, provisional sums do three useful things for the contractor:

They make the bid look lower. If the owner's documents leave the allowance to the contractor, a low allowance makes the total more competitive, and the real cost arrives later.
They move risk to the owner. Whatever the item eventually costs, the owner pays it.
They often carry their own mark-up and attendance. Read how the contract adjusts provisional sums: is the contractor's overhead and profit added to the difference, and is there extra time?

In Dubai, this is particularly relevant on luxury villas, where kitchens, wardrobes, lighting, automation, AV and loose specialist items are often left as allowances because the owner has not chosen yet. In our experience, a bid where these make up a large share of the total is not really a fixed price at all.

What to do: resolve as many items as you can before pricing. Where you cannot, set the provisional sums yourself, at realistic levels, so every bidder carries the same figure. Then compare bids on what is left.

Why are preliminaries the line to watch?

Preliminaries are the cost of running the site: the site manager, welfare, security, temporary power and water, scaffolding, hoarding, plant, insurances, waste and so on. Turner & Townsend put contractor preliminaries in Dubai at 12–14% (as cited by PRASOON).

The important point is that many preliminaries are time-related. They are priced per week or per month. That means:

A contractor who prices a short programme can show a low preliminaries figure. If the programme then slips, the time-related costs reappear in an extension-of-time claim.
Every week of delay that the contract attributes to the owner, through late decisions, late information or changes, carries a weekly cost.

When we compared our own bids against competitors, an unusually low preliminaries figure usually meant one of two things: an unrealistic programme, or preliminary costs hidden elsewhere in the rates. Ask every bidder for a weekly breakdown of time-related preliminaries. It tells you what delay will cost before it happens.

How are variations built?

A variation is a change to the work. Some are genuine owner changes. Many are not; they arise because the drawings were unclear, two consultants' drawings disagreed, or something necessary was simply missing.

On the contractor's side, the commercial team reads the contract documents looking for exactly these gaps, from the day the job is won. Every ambiguity is a potential variation. Every late answer to a request for information is a potential delay. This is ordinary practice, and a contractor who did not do it would not stay in business for long.

How a variation claim is typically assembled:

The direct cost of the extra or changed work, priced at contract rates where they apply and at new rates where they do not. New rates are where the margin tends to be.
Knock-on costs: work removed or redone, materials wasted, re-sequencing.
Time: if the change affects the critical path, an extension of time, and with it time-related preliminaries.
Disruption: loss of productivity from working out of sequence.

The defence is the same in every case: price the variation and agree its time effect before it is instructed, in writing. A variation agreed after the work is done is priced by one party, the one that did it. We cover the contractual side in villa construction contracts in the UAE; take advice from a UAE-qualified lawyer on your specific contract.

Who owns the programme float?

Float is the slack in a programme: the amount an activity can slip without delaying completion. Owners rarely think about it. Contractors think about it a great deal.

If the contract is silent, the practical answer is usually that float is used by whoever needs it first. A contractor who has planned well keeps float in its own activities and presents a programme where the owner's decisions sit on the critical path, with no slack. Then any late owner decision, a tile not chosen, a sample not approved, causes immediate, claimable delay.

When reviewing a contractor's programme, look for:

Owner decisions shown with no float, while the contractor's own activities have plenty.
Durations for long-lead items that assume orders the owner has not yet been asked to approve.
A programme without a clear list of information required from the owner, and when.

A decision schedule, agreed at the start, listing every owner choice and the latest date it can be made without delay, is one of the cheapest protections an owner can have.

Why is the cheapest bid rarely the cheapest outcome?

Put the pieces together. The lowest bid often has some combination of low provisional sums, tight exclusions, a short programme with low preliminaries, and keen rates on the measured work but generous scope to recover through new rates. It may also have been priced by a contractor who needs the turnover.

None of that is visible in the total. It is visible in the breakdown, which is why bids should be compared line by line, with provisional sums normalised, exclusions priced back in, and preliminaries tested against a realistic programme. Our guide to choosing a villa contractor in Dubai shows how.

There is one more factor: design. In August 2025, Dubai Municipality warned villa consultancies about over-designing structures and inflating build costs (Gulf News). A competitive bid on an over-designed villa is still a bid for more building than you need.

How should you read a monthly valuation?

Each month the contractor submits a valuation: the value of work done to date, less previous payments and retention. On the contractor's side, the valuation was also a cash-flow tool, and it was normal to value optimistically. Front-loading, valuing early activities generously so cash arrives ahead of cost, is common practice across the industry.

Read a valuation line by line:

Is the work actually installed? Not delivered, not "in progress", installed. Materials on site are a separate question, and paying for materials off site needs proof of ownership and insurance.
Do percentages match what you see? If the electrical installation is valued at 60%, is 60% of it actually done?
Are variations valued only once agreed? Unagreed variations should be shown separately, not slipped into the total.
Is retention being held correctly?
Does the cumulative value track the programme? A valuation running ahead of physical progress is a warning sign, especially if the contractor's position is weakening. If the site then slows or stops, see what to do when your villa build stalls.

Our cost and programme control service reviews valuations for owners independently.

Where is your snagging leverage?

Practical completion and handover is the moment the balance of power shifts. Before it, the contractor wants the final payments, the release of part of the retention, and to stop paying for the site. After it, they have moved their team to the next job.

From the builder's side, we always knew which defects would be fixed promptly: the ones listed before handover, while money was still held. Defects raised months later, with retention already released, joined a queue.

So:

Snag thoroughly before accepting handover, with an independent inspection, not just a walk-round. Our villa snagging checklist is a starting point.
Do not release payments or retention until agreed defects are rectified, within what your contract allows.
Insist on as-built drawings, operating manuals, warranties and test certificates before handover, not after.
Know your defects liability period and diarise inspections well before it ends.

How Eastbridge can help

We spent two decades as the builder. Now we sit on the client's side of the table, working alongside your registered consultant and your contractor. We help you compare bids like-for-like, test programmes, review valuations and variations, and protect your position at handover. See our variations, delays and claims service, or contact us to talk through your project.

Philip Chapman, Founding PartnerFounded and ran P Chapman Construction, a £17m UK builder of award-winning homes, for 21 years. Now represents villa owners in Dubai and Abu Dhabi. About Philip

Questions

Why is the cheapest villa construction bid rarely the cheapest outcome?

Because the lowest bid often carries low provisional sums, tight exclusions or optimistic preliminaries. The difference is recovered later through additions and variations priced without competition.

What is a provisional sum in a villa building contract?

An allowance in the contract for work that has not been fully designed or chosen yet, such as a kitchen or lighting system. When the real item is selected, the contract sum is adjusted up or down to the actual cost.

What are preliminaries on a construction bid?

The contractor's cost of running the site: management, welfare, temporary works, plant, insurance and similar. Turner & Townsend put them at 12–14% in Dubai, as cited by PRASOON. Many are time-related, so they grow with delay.

When do I have the most leverage over my contractor?

Before handover, while payments and retention are still held. Once you have taken possession and released money, the contractor's incentive to return for defects drops.

Sources

This article is general information, not advice for your specific project. Figures are from the sources cited and change over time.