How to Get Multiple Quotes for Building Work: A Fair Comparison Guide

**The typical flawed approach**:

A homeowner asks three contractors to visit the site. Each contractor sees the same house and hears the same (incomplete) verbal description of what is wanted. Each then produces a quote based on their own interpretation of the scope, their own material allowances, their own assumptions about the level of finish, and their own profit margin requirements.

The result: three quotes that may differ by 30–60%, and a homeowner who has no way to understand why.

• *Typical reasons for large price differences between quotes on the same project*:
• •Different interpretation of scope (Contractor A has included full plastering; Contractor B has priced for patching only; Contractor C has excluded plastering entirely)
• •Different material specifications (kitchen worktop in one quote is laminate; in another it is quartz)
• •Different assumptions about client-supplied items (one has included bathroom tiles; another has assumed client supply)
• •Different assumptions about unforeseen conditions (one has allowed a £5,000 provisional sum for drainage; another has assumed no drainage complications)
• •Different allowances for design, planning, and structural engineer input
• •Different overhead and profit levels
• •Different assumptions about what 'good enough' finish looks like

None of these differences are dishonest — they reflect the absence of a clear scope document that every contractor is pricing against.

**The fix: a scope document (and ideally a specification)**:

The fundamental requirement for a like-for-like tender is a written scope of works — a document that describes what is included, what assumptions each contractor must price on, what is excluded, what the client will supply, and what the contractor must allow for in their price.

For a complex project, this document is the specification — produced by an architect or designer as part of the design package. For simpler projects, even a basic written scope (two to three pages) dramatically improves the comparability of quotes.

*What a good scope of works for tendering should cover*: 1. Project description — what is being built or renovated, at what address, starting from what existing condition 2. Structural scope — who is responsible for the structural engineer's design, and who is pricing the structural works 3. Materials — which materials are contractor-supplied vs. client-supplied (second-fix materials, kitchen, bathroom sanitaryware, tiles, flooring) 4. Specification levels — where a clear standard is required (underfloor heating specification, insulation U-values, window glazing unit specification) 5. Compliance — who is responsible for Building Regulations applications, planning conditions discharge, etc. 6. Provisional sums — items that cannot be fully scoped at the tender stage should be listed as provisional sums at a realistic level (drainage surveys, electrical rewires where the condition is unknown, etc.) 7. Exclusions — what is explicitly NOT included in the contract 8. Programme assumptions — start date, expected duration, any constraints on working hours

**How many contractors should tender?**

Three is the standard — it provides competitive tension without creating excessive administration. Two quotes is insufficient if one contractor withdraws; five or more quotes is waste — most contractors will not invest serious time in a tender where they perceive their chance of winning is low.

**How to identify and qualify contractors before inviting them to tender**:

*Do not use an online directory as the sole source*: Checkatrade, Bark, MyBuilder, and similar directories provide a pool of contractors with reviews, but the reviews are of variable reliability and the directories do not verify that the contractor has capacity, the right insurance, or the specific experience your project requires. Use directories as a starting point, not an end point.

• *Key qualification checks before inviting a contractor to tender*:
• •Company or sole trader registration (Companies House or HMRC) — confirms they are a legitimate trading entity
• •Public liability insurance — minimum £2,000,000; request the certificate, not just confirmation that they have it
• •Employers' liability insurance — required by law if the contractor has employees
• •Membership of a recognised industry body (FMB, TrustMark, NFRC, CIPHE, NICEIC) — not a guarantee of quality but a meaningful marker of commitment
• •Previous project examples — photographs, ideally with client references you can follow up
• •Capacity — when can they start, how many concurrent projects are they managing, who will be on site day-to-day

*Initial qualification interview*: A 15–30 minute call or meeting to cover: their experience with the specific project type, their approach to Building Regulations and compliance, who manages the project day-to-day (the person you meet at the tender meeting or someone else), and their current workload. If a contractor cannot articulate their approach to Building Regulations clearly, that is a warning sign.

**Issuing the tender and managing the process**:

1. Issue the scope of works (and drawings, if available) to all three contractors at the same time — same document, same information 2. Set a clear tender return date — 2–3 weeks is appropriate for projects up to £50,000; 3–4 weeks for larger projects 3. Hold a joint site visit (all three contractors on site at the same time) — this ensures every contractor sees exactly the same conditions, and any questions are answered the same way for everyone 4. Accept questions by email only (so all contractors receive the same clarifications) — if a contractor calls with a question, respond in writing to all three 5. Require a structured tender return — ask contractors to price against your scope document, not to produce their own format

**Evaluating tender returns**:

*Do not automatically accept the lowest price*: The lowest price is sometimes the best value — but it is often the result of scope gaps, optimistic assumptions, or a contractor whose overhead structure means they will be cutting corners to make the project profitable. Before comparing prices, compare scope coverage:

1. Check that every scope item has been priced 2. Identify any exclusions each contractor has noted 3. Identify any provisional sums and check they are realistic 4. Check whether materials allowances are specified — an 'allowance' for bathroom tiles of £20/m² when you want £60/m² tiles is a £4,000 scope gap per bathroom 5. Ask for a breakdown of the price by trade or by stage — this allows line-by-line comparison

• *Weighted evaluation criteria*:
• Price should be one of several evaluation criteria — typically weighted at 40–50% for a domestic project. Other criteria:
• •References from comparable projects (20–25%)
• •Programme — start date and duration (10–15%)
• •Method statement — their approach to the specific challenges of the project (10–15%)
• •Contract terms and payment structure (10%)

**The clarification stage**: Before awarding the contract, a clarification meeting with the preferred contractor is essential. The purpose is to confirm that the price covers everything in the scope, to resolve any provisional sums, and to confirm the programme. This is also the stage at which any value engineering opportunities can be discussed collaboratively.

**1. Choosing on price alone**: The homeowner who chooses the cheapest quote without understanding why it is the cheapest is buying a risk. The cheapest contractor may be genuinely efficient — or they may have missed scope, be using inferior materials, or be underpricing their labour to win the job. The clarification stage (asking for line-by-line breakdown and scope confirmation) is the only way to understand why a quote is cheap.

**2. Not taking references**: References from recently completed comparable projects are the most reliable indicator of a contractor's actual quality of work, site management, and commercial integrity. Asking for references is standard practice — a contractor who refuses to provide them or who provides references that cannot be contacted is a warning sign. Follow up the reference personally (by phone, not just by email) and ask specifically about: quality of finish, programme adherence, responsiveness to defects, and how they handled unforeseen conditions.

**3. Not inspecting previous work**: Photographs can be misleading. Visiting a completed project (with the client's permission) and inspecting the standard of finish, the quality of the plasterwork, the levelness of the tiling, and the condition of the external works gives a far more reliable picture of what to expect.

**4. Accepting a quote without a contract**: A quote (even a detailed one) is not a contract. The contract is the document that defines the scope, the price, the programme, the payment terms, the variation procedure, and the defects liability period. For any project above £10,000, a JCT Minor Works contract (or a similar standard form) should be used. A handshake agreement or a one-page letter of intent is not adequate protection for either party.

**5. Starting before the contract is signed**: Allowing a contractor to start work before the contract is signed (because the contractor says they need to start now) removes the client's negotiating position. A contractor who is already on site is much harder to manage commercially than one who has not yet started. Always complete the contract and have it signed before allowing any work on site.

**6. Making partial payments ahead of completed work stages**: The payment structure should tie payments to completed, verifiable stages of work — not to the contractor's cash flow needs. Paying 50% upfront before work starts is standard for some trade sectors but is a high-risk position for the client in a project with a large contractor element.