How to get a Decking Quotation | Guide for UK Homeowners

Obtaining a decking quotation should be one of the simpler stages of planning a new garden deck, although the quality of the information behind that quotation makes an enormous difference.

Homeowners often ask three contractors to price what appears to be the same deck, then receive three very different figures. The natural response is to compare the totals, but that comparison only works when each contractor has priced the same design, materials and scope of work.

If one contractor has allowed for a substantial structural frame, proper foundations and premium fixings, while another has simply priced some boards over timber joists, the two quotations are not really comparable. The difference may have very little to do with profit and considerably more to do with what each contractor believes they have been asked to build.

For a substantial deck, the process should normally move from survey and design into specification, then quotation and contract. When those stages happen in the correct order, you can understand what you are buying and compare competing prices far more fairly.

How do I get a decking quotation?

Decking sits within an unusual part of the construction and landscaping market because several types of contractor may offer to build it. A dedicated decking specialist may construct decks every week, while a landscape contractor may include them within larger garden projects. Carpenters and general builders may also offer decking, although the amount of specialist experience can vary considerably.

None of those labels automatically guarantees good or bad work, so look beyond the job title. Ask how regularly the company builds decks, which materials they know well and whether manufacturers recognise or approve them for the products you are considering.

If you have already chosen a particular decking manufacturer, check the manufacturer’s current installer network rather than relying only on a logo shown on the contractor’s website. Installer schemes change, and you should confirm that any claimed accreditation remains current.

Does the size of the decking company matter?

Decking businesses come in many forms, and the size of the company will affect how it operates. A sole trader may remain personally involved with every stage, while a small team can combine site experience with better administrative support.

Larger businesses may have dedicated designers, estimators, project managers and separate installation teams. Their overheads may be higher, although they may also have greater capacity and more formal systems.

The historic Decking Network guide divided contractors broadly into one-person businesses, small teams, medium firms and larger companies. That remains a useful way to understand why contractors can work at different speeds and carry very different overheads.

However, company size should not decide your appointment. What matters is whether the contractor can design, specify, price and deliver the deck you require, while communicating clearly throughout the project.

Why do decking quotations vary so much?

There are perfectly legitimate reasons for receiving different prices, even where several contractors visit the same garden. Labour rates vary, overheads differ and some businesses include considerably more project management than others.

The largest differences, however, often appear because the contractors have not priced the same deck.

One installer may allow for a C24 treated timber subframe, while another proposes aluminium or HDPE. Foundation systems may differ, as can joist centres, structural connections, fixings, fascia details, stairs and balustrades. Even quotations using the same surface board can therefore describe very different installations.

The amount of design work also makes a difference. One contractor may have surveyed levels and developed the structure before pricing. Another may have measured the approximate area and multiplied it by a square-metre rate.

Both documents may carry the heading “quotation”, yet the information behind them can be entirely different.

The design should come before the quotation

For a small and straightforward ground-level deck, a contractor may be able to survey, design and price the work within a relatively simple process. More complicated decks need considerably more information before an accurate price becomes possible.

Changes in level, stairs, balustrades, retaining requirements, lighting and complicated board layouts all affect cost. The same applies to access restrictions and structural loads.

A drawing removes much of this ambiguity because it gives each contractor the same starting point. It should show the overall dimensions and shape, together with the important levels and features that affect construction.

Depending on the project, drawings may also show stairs, balustrades, board direction, fascia details, access panels and lighting positions. The drawings then work alongside the written specification rather than trying to describe everything themselves.

This is one reason that obtaining three prices from three contractors before developing the design can become misleading. Each installer may solve the garden differently, so the homeowner receives prices for three different ideas rather than three prices for one agreed project.

You can read more about this process in our Complete UK Homeowner’s Guide to Planning a New Garden Deck. This is one the single most important and helpful guides on the internet for UK homeowners wanting a new deck in their garden.

The specification tells you what you are buying

The specification sits behind the drawings and describes the parts of the project that a plan cannot show clearly. It should identify the important products, structural materials and construction requirements that form the agreed deck.

For example, “composite decking” is not a useful specification. The document should identify the manufacturer, range and colour where those decisions have already been made.

The same principle applies below the boards. The quotation and specification should make the proposed subframe clear, together with important foundations, fixings and finishing details.

The more complex or valuable the project becomes, the more important this information becomes. A homeowner spending a substantial amount on a new deck should not need to guess what supports it.

What should a professional decking quotation include?

Once the design and specification are sufficiently clear, the quotation can do its proper job. It should put a price against an identifiable scope of work and explain the commercial terms that apply.

A good decking quotation should normally identify:

The document does not need to become fifty pages long, although it should contain enough information for both parties to understand the agreement. Clear exclusions can be just as important as clear inclusions because they remove assumptions before work begins.

What should the quotation say about VAT?

The original version of this guide suggested that every professional installer should be VAT registered. That is not correct, so this updated guide removes that statement.

A contractor’s VAT position depends upon their circumstances and taxable turnover. The important point for the homeowner is clarity.

The quotation should explain whether the contractor is VAT registered and whether the stated total includes VAT. Never compare one VAT-inclusive price with another price that still has VAT to be added.

Quotation or estimate: what is the difference?

This distinction has appeared in the Decking Network guide for many years, and it remains important.

An estimate gives an approximate indication of the likely cost, while a quotation normally gives an agreed price for defined work. That distinction only works properly when the scope has been described clearly.

If the document says “estimate”, ask why the contractor cannot provide a quotation once the design and scope are agreed. There may be a sensible reason where important information remains unknown, although you need to understand which parts can change.

A quotation should also explain the circumstances that could alter the final cost. Additional work requested by the homeowner and genuine unforeseen conditions need a clear process for approval.

What information should you give the contractor?

A contractor cannot produce an accurate quotation when the homeowner provides very little information. Equally, an early conversation can become confusing when every possible garden feature enters the discussion before the main deck has been defined.

Begin with a clear brief. Explain where you want the deck, how you plan to use it and whether you have a preferred material. If you have a realistic investment range, discuss that as well.

If you already want Trex, Millboard, Deckorators, Kebony or another specific product, say so. A contractor can then advise whether that material suits the project and price the correct product rather than making assumptions.

For a substantial project, commissioning the design before seeking competitive quotations creates a far stronger comparison. Each contractor can then price the same information.

What about a quotation sent by text or WhatsApp?

The format matters less than the quality of the written information, although a substantial project deserves a proper document. A figure sent in a message cannot reasonably describe a complex scope of work.

You should have a written quotation that you can retain with the drawings, specification, contract and later invoices. This gives both parties a clear record of what they discussed and agreed.

For a small repair, an email may contain enough detail. For a £20,000, £40,000 or larger deck, a single-line message stating a price does not provide the level of information that the project deserves.

Payment terms should make sense

The quotation should explain when payments fall due and how those payments relate to the project. The exact structure will vary according to the contractor, materials and value of the work.

A deposit may cover design work, mobilisation or products ordered specifically for the project. Later payments may follow agreed stages, with a final balance due near completion.

The important point is that the homeowner understands the schedule before work starts. Avoid arrangements where large sums become due without any clear relationship to materials, progress or agreed milestones.

Keep formal invoices and receipts for every payment, together with written records of any agreed variations.

Should you automatically choose the cheapest quotation?

No, although that does not mean the most expensive quotation must be better.

Start by checking the scope. A lower price may represent excellent value, or it may omit work that another contractor has included. Until you understand that difference, the totals alone tell you very little.

Look at the proposed structure, foundations, materials, fixings and finishing details. Check the exclusions and determine whether one quotation contains provisional allowances that another contractor has priced properly.

Then consider the company itself. Experience, communication, insurance, manufacturer recognition, previous work and the people who will actually build the deck all matter.

The decking journey: from survey to handover

The original version of this guide included the complete decking journey, and that information remains worth preserving. The sequence may vary slightly between businesses, although a substantial project should move through recognisable stages.

Questions to ask before accepting a decking quotation

Before appointing the contractor, read the quotation alongside the drawings and specification rather than treating it as a stand-alone price. If something important remains unclear, ask before you accept the offer.

Our advice before you accept the quotation

A professional decking quotation should give you confidence rather than leave you trying to interpret what the contractor might have meant.

The strongest quotation will normally sit behind a clear design and specification. It should tell you what the contractor has priced, what remains outside the price and how payments and changes will work.

Do not compare three figures until you have compared the three scopes. A detailed quotation may initially appear more expensive because it includes work that another document leaves undefined.

Good decking starts long before the first board arrives on site. The survey, design, specification and quotation create the foundation for the commercial relationship, while the contractor turns those decisions into the finished deck.

If you want to understand the likely investment before speaking with an installer, you can also read our guide to how much garden decking costs in the UK.