Why Quotes Feel Confusing (And How To Compare Like‑For‑Like)
Quotes for the same kitchen, bathroom or extension can look very different. One may be a tidy fixed price with a few allowances; another may include several line items labelled PC sums and provisional sums. It is not smoke and mirrors, but it can hide the true total if you do not decode it.
Here is the shortcut. A fixed price covers defined work. A PC sum is an allowance for items you will choose later. A provisional sum is an estimated cost for work that is not fully known yet. Your aim is a clear, comparable total with no surprises. For more practical context, see our blog and recent projects.
The Anatomy Of A UK Builder’s Quote
A thorough quote starts with scope. It should list rooms and tasks, and state what is included. You should see itemised labour, materials supplied, and any testing or certification. If it is not written down, do not assume it is covered.
Good quotes reference drawings, specifications and schedules, so everyone is building the same thing. A clear pricing page should label what is fixed, what is a PC sum (items), and what is provisional (works). For example: fitting a bath is fixed labour; taps may be a PC sum; possible subfloor repair may sit as a provisional sum. If you need help pulling a brief together, our design & planning and frequently asked questions pages are a good start.
PC Sums Explained: Allowances For Chosen Items
PC (Prime Cost) sums are allowances for products you will select. Typical examples include kitchen taps, sinks, appliances, worktop accessories, tiles, bathroom sanitaryware and flooring. In extensions, it can include doors, ironmongery and light fittings.
Choose within the allowance and the price stays the same. Choose above and you pay the difference; below and you get a credit. Example: tap allowance £250. If you pick a £310 tap, you add £60. Pick a £200 tap and you save £50. To stay on budget, shortlist early and ask which suppliers the allowance suits. For ballpark figures, see kitchen installation costs in Essex and bathroom renovation costs in the UK.
Provisional Sums Explained: Estimated Works And Unknowns
Provisional sums are estimated costs for works that cannot be confirmed at quote stage. Common cases are hidden pipework, drainage alterations, the size of structural steel, or the condition of subfloors and ground. Your builder makes a reasonable allowance based on what is visible.
Once we strip out or investigate, we check the actual requirement and agree any difference as a variation, up or down. You can reduce risk with pre‑works surveys, limited opening‑up, and by sharing old plans or photos. Good access for inspection helps too. Ask your builder how and when each provisional item will be confirmed.
Allowances, Exclusions And Assumptions That Change Your Total
Exclusions and assumptions often explain price gaps. Read them closely and get them in writing.
- Common exclusions: decoration, final painting, deep cleaning, waste removal beyond standard, appliance supply, specialist waterproofing, and out‑of‑hours work.
- Fees: planning, building control, structural engineer, party wall, skips and permits.
- Services and compliance: consumer unit upgrades, extra circuits, lighting design, test certificates, hot‑water capacity, UFH manifolds, ventilation and extractor ducting.
- Groundworks and structure: assumed soil bearing, drainage runs, foundation depth, wall make‑up, lintel/RSJ sizes until verified.
Clarify who supplies what, especially appliances and specialist finishes. Ask for all assumptions to be listed with the quote so you can compare fairly and avoid late changes.
Change Control: Managing Variations The Right Way
Variations happen. Some are client‑led, such as switching a tile range. Others are site‑led, such as finding rotten joists. Either way, use a simple process: scope the change, get a written price and time impact, and approve in writing before work starts.
Keep a basic change log with date, description, cost and status. It keeps decisions tidy and the budget visible. Allow a 10–15% contingency depending on complexity and unknowns. Ask for weekly updates so you always know cost‑to‑complete before the next stage.
Example: Same Kitchen, Three Quotes — How To Compare Fairly
Build a quick sheet with columns for fixed price, total PC sums, total provisional sums, exclusions, programme and warranties. Add notes on who is supplying appliances and worktop. Now “normalise” the quotes: agree the same allowances for taps, tiles and appliances so only workmanship and management differ.
- What PC allowances have you assumed for appliances, taps and tiles?
- What provisional sums are included, and when will you confirm them?
- What is excluded that most clients expect to be in?
- How long is the programme and what affects it?
- Who is the site supervisor and how often will I get updates?
- What warranties and certificates will I receive?
Red Flags And Green Flags In A Quotation
- Green flags: clear line‑by‑line breakdown, labelled PC/provisional items, referenced drawings, milestone‑based payments, realistic programme, named supervisor, insurance and warranties.
- Red flags: vague “as required” lines, missing spec, very low PC allowances, a single lump sum with no detail, no mention of lead times or certificates.
- Verify before you sign: public liability insurance, recent local references, and a couple of projects you can view.
Realistic Budgeting For Essex Kitchens, Bathrooms And Extensions
Think in totals: labour + realistic PC sums + provisional risks + fees. For kitchens, include cabinetry fitting, worktops, appliance PC sums, electrics and lighting. For bathrooms, allow for prep and waterproofing, tiling, sanitaryware PC sums and ventilation.
For extensions, decide if you want a shell or a turnkey finish. Glazing and heating (UFH or radiators) can shift costs, as can service upgrades. Local fabric, access and heritage factors in Essex and Colchester can add time or surveys. Use allowances that match the quality you expect, then add a sensible contingency.
How Cube Keeps Your Final Bill Predictable
At Cube Installations, we front‑load clarity. Early Design & Planning, detailed specs and tidy schedules remove guesswork. We right‑size PC sums using local suppliers we know and trust, so your choices fit the allowance.
On site, you get weekly updates, prompt pricing for any variation, and straightforward approvals. That keeps programme and spend under control. Share your drawings or brief for a clear, comparable quote, or ask us to review quotes you already have. Ready to talk? Contact us.
FAQs
Are PC Sums Bad News For My Budget?
No. They are simply allowances. Pick within them and the total stays the same; go over and you pay the difference.
When Do Provisional Sums Become Fixed?
After strip‑out or investigation. Your builder confirms the scope, prices any change in writing, and seeks approval before proceeding.
What Documents Help Me Get A Firm, Comparable Quote?
Scaled drawings, a brief spec, product shortlist and photos. The clearer the info, the fewer provisional sums you’ll need.
Is The Lowest Quote Always Best?
Not if it relies on tiny allowances or vague exclusions. Normalise the spec and check what’s missing before you decide.