Why Roofing Tenders Often Receive Widely Different Prices

When a roofing tender is returned, it's not unusual for the prices submitted by different contractors to vary significantly.

In some cases, one tender may be tens of thousands of pounds lower or higher than another, leaving clients wondering how multiple contractors can look at the same project and arrive at such different figures.

The reality is that roofing tenders are rarely as straightforward as they appear. Differences in assumptions, scope, access requirements and risk allowances can all have a major impact on pricing.

Understanding why roofing tenders vary can help building owners, consultants and procurement teams make more informed decisions.

Not Every Contractor Is Pricing the Same Scope

One of the most common reasons for price differences is that contractors interpret tender information differently.

This can happen when:

• Specifications lack detail

• Drawings are unclear

• Existing roof conditions are unknown

• Access arrangements have not been confirmed

• Repair allowances are not fully defined

Two contractors may therefore be pricing slightly different solutions despite responding to the same tender package.

Existing Roof Conditions Can Affect Pricing

Many roofing projects involve existing buildings where the full condition of the roof is not yet known.

Contractors may make different assumptions regarding:

• Roof deck condition

• Insulation condition

• Hidden defects

• Moisture within the roofing system

• Structural repairs

Those assumptions can significantly influence the final tender value.

As discussed in Why Roofing Problems Can't Be Diagnosed From Photos Alone, some defects only become apparent following closer inspection.

Access Requirements Are Often Underestimated

Access can be one of the biggest variables in a roofing project.

Factors that affect pricing include:

• Scaffolding requirements

• Restricted access areas

• Occupied buildings

• Working hours

• Traffic management

• Public protection measures

A contractor who fully allows for these requirements may appear more expensive than one who has underestimated them.

Different Contractors Have Different Risk Appetites

Some contractors include larger allowances for risk and unforeseen works.

Others may price more aggressively in order to secure the project.

This can create significant differences between tenders even when the scope appears identical.

For clients, understanding how risks have been assessed is often just as important as comparing the final figure.

Materials and Specifications Can Vary

Not all roofing systems are equal.

Contractors may propose:

• Different manufacturers

• Alternative specifications

• Varying warranty periods

• Different insulation solutions

• Alternative detailing methods

These choices can influence both initial costs and long-term performance.

Site Visits Often Improve Pricing Accuracy

While some tenders are priced entirely from documentation, site visits can provide valuable information that drawings and photographs may not reveal.

A site visit can help identify:

• Access constraints

• Existing defects

• Health and safety considerations

• Occupied building requirements

• Areas requiring further investigation

This often leads to a more accurate and realistic tender submission.

The Lowest Tender Is Not Always the Best Value

Price is important, but it should not be the only consideration.

Clients should also review:

• Relevant experience

• Proposed methodology

• Health and safety credentials

• Programme duration

• Warranty provisions

• Quality assurance procedures

A lower tender may not always represent the best long-term value for the building.

As discussed in Why One Roofing Quote Can Be Double Another (And What You're Actually Comparing), understanding what is included is often more important than focusing solely on price.

What This Means for Building Owners and Consultants

Large differences between roofing tenders are common and do not necessarily indicate that one contractor is wrong.

Instead, they often highlight differences in assumptions, risk allowances, specifications and project understanding.

Taking time to review tender submissions properly can help ensure the chosen contractor is providing the most appropriate solution rather than simply the lowest price.

Understanding the tender stage is only part of the process. Once a contractor is appointed, projects move through planning, health and safety, mobilisation, delivery and handover. Our Tender to Completion Guide explains each stage in more detail.

Need Advice on a Roofing Project?

At Premier Roofing & Construction Limited, we regularly work with consultants, housing associations, managing agents and public-sector organisations on roofing tenders, refurbishment projects and planned maintenance works.

Arrange a site visit to discuss your project and ensure any proposed works are based on a clear understanding of the building and its requirements.