Why The Cheapest Quote Is Usually The Most Expensive

Key takeaways

• The six things most often missing are underlay, battens, fixings, access, disposal and any allowance for what is found.
• Everything omitted is hidden once the roof is finished, which is why it can be omitted at all.
• A price that has to be revised mid job is negotiated from your weakest position.
• The cost of doing roofing twice includes paying for access twice.
• Cheap is only meaningful once two quotes describe the same work.

Why roofing in particular

Some trades produce work you can inspect. Roofing mostly does not. Once the covering is back on, nobody can see what underlay was used, whether the battens were renewed, what the fixings are made of, or how the flashings were formed. That asymmetry is the structural reason low prices are more common and more consequential here than in trades where the work stays visible. It is not that roofers are less honest than other trades; it is that the customer's ability to verify what they paid for is close to zero, and any market with that feature will contain a range of prices that do not reflect a range of quality.

The underlay

The most common omission and the most consequential. Relaying a covering onto the existing underlay saves the material, the labour of stripping it and the time to fit new, and it produces a roof that looks identical from the ground. If the existing underlay is perished bitumen felt, which on a roof old enough to need recovering it usually is, the new roof has no functioning secondary barrier from the day it is finished. It will shed ordinary rain and let water in during driven rain, and the fault will not be traceable to anybody. Any quote that does not mention underlay should be assumed not to include it.

The battens

Second most common. Battens carry every tile on the roof, they are what the fixings go into, and on an old roof they are frequently soft where water has reached them. Reusing them saves both material and labour, and the result is a new covering nailed into timber that is at the end of its life. Graded batten costs relatively little; the labour of stripping and replacing is the real expense, which is exactly why it gets skipped. The failure mode is slow and looks like bad luck: tiles begin slipping a few years into a roof that was supposed to last decades.

The fixings

Where slate is involved, the fixings are the whole reason the work is being done. Iron nails reaching the end of their life is what brings these roofs down, so putting the slates back on anything other than stainless or copper simply restarts the same clock. The cost difference between correct and incorrect fixings on a domestic roof is modest. The consequence is that the roof fails again in a fraction of the time, by which point the contractor is difficult to locate. This is why asking what fixings will be used is one of the most informative questions available, and why a quote silent on it deserves the question.

The access

Access is often the largest single line on a roofing job, so omitting it produces the most dramatic price difference. A quote that assumes ladder access for work that genuinely needs a scaffold is not cheaper; it is describing a job that either will not be done properly or will be repriced once it starts. The second outcome is the common one, and it arrives at the moment you have least room to argue. Access is also the item most easily checked between quotes, since it is a discrete cost that can be asked about directly and compared line for line.

The disposal

Stripping a roof produces a large volume of heavy material that has to be removed and disposed of legally, and that costs real money in skips, permits and tipping charges. Leaving it out of a quote is easy and the consequence surfaces at the end of the job as an additional charge, or occasionally as material left in your garden. It is also worth knowing that waste from work carried out for you must be handled by somebody authorised to do so, and that fly tipped material traced back to a property can become the householder's problem, which is a rare but real consequence of engaging somebody very cheap.

The allowance for what is found

The most sophisticated omission is silence about the unknown. Every roofing job carries genuine uncertainty about the state of the battens and the deck beneath the covering. A quote that says nothing about it appears complete and cheap, and creates a position where additional work is proposed at a moment when the roof is open, the weather is coming, and refusing is not practical. That is not necessarily dishonest, and it is a predictable outcome of not having addressed it up front. A quote that states its assumptions and gives a rate for the alternative looks more expensive on paper and frequently is not.

The arithmetic of doing it twice

The decisive point is what a repeat costs. If a roof laid on old battens with the wrong fixings fails after eight years, the second job is not the difference between the cheap and the proper quote. It is the whole job again: strip, dispose, materials, labour, and crucially the access, which has to be paid for a second time in full. Set against that, the premium for doing it correctly once is generally a modest fraction of one job, and it buys decades rather than years. The saving on the cheap quote is real and it is a loan, repaid with interest at a time you do not choose.

What legitimately makes one quote cheaper

It is worth being fair, because not every low price is a warning. A contractor with a quieter period may price keenly for the work. A local firm with no travel costs and a yard nearby has genuinely lower overheads than one coming from further away. A smaller business without the overheads of a larger one can charge less for the same standard. Somebody already working on your street with scaffold up can offer a price nobody else can match. Those are real reasons and they share a feature: the contractor can explain them, and the scope of work is unchanged. Ask why, and a legitimate answer arrives easily.

How to tell the two apart

Put the quotes side by side and look at what each one says rather than what it costs. If the cheap quote names the same underlay, the same battens, the same fixings, the same access and the same disposal as the others, then it is genuinely cheaper and you should probably take it. If it is silent where the others are specific, it is not a cheaper price for the same job, it is a price for a different one. That comparison takes half an hour and it is the only reliable way to answer the question, because the difference is never visible in the totals.

The one that should worry you most

The quote to be most careful with is not simply the lowest but the one that is dramatically below the others while claiming the same scope. Three quotes clustered together and one at half the price is not a bargain, it is an outlier, and outliers in this trade almost always resolve into one of a few explanations: something substantial has been misunderstood, something has been left out that the customer has not noticed, or the price is expected to rise once work begins. In every one of those cases the eventual cost is not the number on the paper, which is unfortunately the only number the customer is comparing at the point the decision gets made. That is the entire difficulty expressed in a single sentence, and it is the reason any useful comparison has to be made between scopes of work rather than between the totals printed at the bottom of each page.

Frequently Asked Questions

Why are cheap roofing quotes risky specifically?

Because roofing work becomes invisible once the covering is back on. Nobody can see afterwards what underlay was used, whether battens were renewed or what the fixings are made of. That inability to verify is the structural reason prices vary so widely without quality varying in the same proportion.

What is most commonly left out?

Underlay, battens, fixings, access, disposal, and any allowance for what is found once the roof is open. Those six account for almost every dramatic price difference, and every one of them is concealed by the finished work, which is why they can be omitted at all.

Why do fixings matter so much on a slate roof?

Because corroded nails are usually the reason the roof needed relaying in the first place. Using anything other than stainless steel or copper reproduces the original failure on a new timetable. The cost difference is modest and the consequence is the roof failing again in a fraction of the expected time.

Is a low quote always a bad sign?

No. A quieter period, genuinely lower overheads, a local yard, a smaller business, or scaffold already standing on your street all produce honest lower prices. The distinguishing feature is that the contractor can explain the reason and the scope of work is unchanged.

How do I tell a genuine bargain from an omission?

Compare what the quotes say rather than what they cost. If the cheap one names the same underlay, battens, fixings, access and disposal as the others, it is genuinely cheaper. If it is silent where they are specific, it is a price for a different job rather than a better price for the same one.

What does it cost if the work has to be redone?

The whole job again, including the access, which is often the largest single item and has to be paid for in full a second time. Set against that, the premium for doing it properly once is usually a modest fraction of one job and buys decades instead of years.