Start with the decision, not another identical application
A rejected allowance can mean several things: an incomplete application, an eligibility decision, insufficient evidence that the leak stopped, or disagreement about the amount of excess water. Sending the same invoice again will not necessarily address the reason. First establish exactly what Thames Water has decided and which information it relied on.
Keep the refusal email or letter with the original application and its submission confirmation. If the decision was given by telephone, record the date, reference and explanation in your own notes, then ask for the reasoning in writing. An accurate short record is more useful than trying to reconstruct the conversation after several more calls.
This guide concerns household leak allowances. A business account handled by a water retailer may follow a different route and policy. Confirm the account type on your bill before applying household rules to a commercial property. Also distinguish a water-bill allowance from an insurance claim: approval of one does not establish entitlement to the other.
Classify the refusal so your reply answers it
Make a simple issue list before preparing attachments. Use the words from the decision and separate each reason if more than one is given. For example, a letter might question both the repair date and the post-repair usage. Solving the first point alone may leave the second unresolved.
| Decision or request | Evidence to check | Useful review question |
|---|
| Repair not established | Invoice scope, completion date, address and contractor details | Which missing fact would establish completion? |
| Repair considered late | Notification, discovery and completion chronology | Which start date and rule were applied? |
| Application considered late | Submission receipt and repair date | Was the original submission received and linked? |
| Usage still high | Correct meter, reading dates, occupancy and ongoing use | Is the issue proof of repair or the normal-use estimate? |
| Previous allowance or excluded repair | Previous decision, leak location and any notice | Which policy provision applies to this leak? |
| Credit lower than expected | Allowance period, consumption baseline and bill calculation | How was the amount calculated? |
Do not describe an application awaiting requested information as a final refusal unless that is what the company has said. Likewise, do not treat a partial credit as acceptance of every cost you submitted. Naming the actual dispute makes the next review more focused.
Check the published household conditions
The current Thames Water household allowance page states a four-week repair requirement from notification or identification, a claim within three months of repair, evidence of completion, and an exclusion for Section 75 repairs. Read the linked full policy as well as the summary and ask which provision supports your decision.
Do not assume that a large bill or an expensive repair overrides an eligibility condition. Equally, a refusal based on an incorrect date or an attachment that was overlooked deserves correction. Your strongest response identifies the factual error or missing evidence and explains how it changes the decision.
The online summary uses three months for the claim deadline, while the published paper form uses 90 days. Apply promptly rather than relying on the difference. If timing is already disputed, provide the exact dates and ask which published wording was applied to your case; do not invent an extension.
The paper form also distinguishes internal leaks from external supply-pipe leaks for repeat claims and makes clear that the allowance concerns lost water rather than the repair bill. If either point appears in your refusal, address the leak classification or cost category directly instead of resubmitting the total plumber's invoice as the amount to reimburse.
Build one chronology with supporting documents
Use a table with four columns: date, event, supporting document and any uncertainty. Include the first notification or discovery, access attempts, investigation, actual repair, post-repair readings, application and refusal. A plumber's first visit and the completion of a later repair are not interchangeable dates.
Where you do not know when a concealed leak began, say so. A high bill may cover a period before you knew about the leak. That billing period should not be presented as the date you discovered it. Preserve distinctions between when water may have started escaping, when you became aware and when the repair was finished.
If access delays matter, record what happened rather than writing only “the landlord delayed everything”. Include the date you reported it, who needed to arrange access, appointment offers and the eventual attendance. Those records may help explain the circumstances, but they do not guarantee that a policy deadline will be waived.
Label documents consistently: notification, repair invoice, completion note, first reading, second reading, application receipt and decision. Put the account number and property on the covering message. Avoid sending a long unlabelled photograph collection in which the reviewer has to guess which image establishes the disputed date.
If the plumber's invoice was not enough
An invoice headed “plumbing work” may show payment without showing that the relevant leak was repaired. Read the description literally. Does it identify the property, attendance date, leaking component or pipe, work completed and contractor? A detection-only report can establish a finding while leaving repair completion unproven.
Ask the contractor for a factual supplementary note if their existing records support one. A useful request is: “Please confirm what was repaired at this address, the completion date and the checks recorded afterwards.” Do not ask them to backdate a repair, assert that no other leak exists, or add a test that was never performed.
Where separate companies detected and repaired the leak, link the documents. The first report should identify the finding; the second should explain what was done about it. If the repair location differs from the first suspected area, explain that difference through the contractor's findings rather than leaving an apparent contradiction.
A paid invoice is not automatically a comprehensive technical report. Ask Thames Water what specific evidence remains missing before buying another visit solely to produce paperwork. A targeted clarification from the original contractor may answer the point; alternatively, a continuing water-loss symptom may justify new investigation for its own practical reason.
If the meter readings do not demonstrate normal use
Check that photographs and written figures relate to the meter serving the account. In a communal cupboard, an incorrect label or photograph of the neighbouring meter can undermine an otherwise sound application. Record the identifying information visible safely and ask Thames Water to clarify any mismatch rather than changing readings to fit a bill.
Each reading needs a date and preferably a time. Comparing two readings without knowing the elapsed period makes a usage comparison ambiguous. The published form requests post-repair readings at least 14 days apart. If safe access is unavailable, ask the company how readings should be obtained; do not climb into a chamber or disturb another property's equipment.
Keep raw readings separate from calculations. For example, label the meter photograph as the evidence and a spreadsheet as your own working. If you correct a typing error, explain the correction and retain the original photograph. Quietly replacing figures in a later version can make a straightforward mistake look harder to reconcile.
Changed occupancy matters too. A relative staying after the repair, building work, irrigation or an appliance using water can make the comparison less straightforward. Record known changes honestly. They may help the reviewer distinguish household use from leakage; they should not be omitted just because they complicate your preferred calculation.
If water may still be escaping
A dispute over the allowance should not delay dealing with a remaining leak. If the meter continues moving when water use should have stopped, first consider legitimate automatic use and whether isolation has actually stopped all outlets. A brief observation is a clue, not proof of a particular buried pipe defect.
Give the attending plumber the first repair details and the ongoing pattern. The original leak might have been repaired while another source of water use remains. Conversely, there may be an incomplete repair or a reading problem. Avoid calling the first contractor's work ineffective until the relevant evidence supports that conclusion.
Keep any second investigation separate in the chronology. Record whether it concerns the same location, another component or an unconfirmed suspicion. That distinction helps both the practical repair and the bill review. A new leak should not be silently added to an earlier claim period without explaining the dates.
If the amount is wrong rather than eligibility
An allowance that is smaller than expected is a calculation dispute, even if it feels like a rejection. Ask for the dates covered, readings used, normal-use assumption and how the credit appears on the revised bill. Compare the response with your original statement of the affected period before challenging the total.
Keep repair costs, normal household charges, previous balances and the claimed excess water separate. Adding them together can produce an expectation that no water allowance was designed to meet. If wastewater charges are part of your question, ask specifically how that element was considered rather than assuming every charge should disappear.
For a hypothetical example, suppose your bill includes a balance carried from an earlier period and current water use after the repair. Even a correctly calculated allowance for the leak would not necessarily reduce the bill to zero. This example illustrates why the revised bill needs checking line by line; it does not estimate what Thames Water should award you.
If you recently moved in and lack earlier readings, say that clearly and ask what baseline was used. Do not borrow a neighbour's usage figure and present it as your own history. Your household circumstances and the company's chosen comparison need to be transparent before anyone can assess whether the adjustment is reasonable.
Write a focused request for review
Your message can be brief even when the evidence is detailed. Identify the decision, state what you disagree with, point to the document that supports your correction and specify the outcome requested. Keep supporting files numbered in the same order as the covering message.
A practical structure is: “Please review the decision dated [date], reference [reference]. The stated reason is [reason]. I believe the relevant fact is [correction], supported by [attachment]. Please explain whether this changes the eligibility decision or calculation, and identify any evidence still required.” Replace the placeholders with accurate information rather than sending the wording unchanged.
If the circumstances are exceptional but the dates are correct, request consideration openly. Do not frame a request for discretion as proof that the published rule was met. Explain the circumstance, supporting records and desired resolution. This allows the reviewer to respond to the actual request instead of debating an inaccurate chronology.
Keep the acknowledgement and any promised reply date. If you use the telephone, send a short follow-up recording the agreed next step through the company's accepted channel. Avoid parallel duplicate applications unless instructed: ask that new evidence be attached to the existing reference so the history stays together.
Use the formal complaint route when the issue remains unresolved
Thames Water's complaint guidance provides a bill-and-account route and allows a review where you remain dissatisfied or a promised response has not arrived. State explicitly when you are making a complaint about the decision or handling, rather than merely supplying an additional reading.
Separate the requested remedy into clear parts. You might seek reconsideration of eligibility, an explanation of the calculation, correction of the account record or a response to mishandled evidence. Listing distinct requests makes it easier to see which parts have actually been answered.
CCW's published complaint process says to raise the matter with the company first and seek its further review if needed. Its free service can then consider a complaint after a final response or after eight weeks. Keep the evidence and correspondence ready; referral does not guarantee that a rejected allowance will be reversed.
If someone is helping you, arrange the necessary authority for them to discuss the account. Send only relevant personal information and use the official contact routes. There is no need to pay an intermediary merely to ask for a clear explanation of the refusal or to contact CCW yourself.
Keep billing and repair decisions separate while you wait
The household allowance page says normal billing and payment arrangements continue during assessment. Do not assume that a review request suspends payment automatically. If the bill is unaffordable, contact Thames Water about support and ask what arrangement applies while the dispute is considered. Retain written confirmation of anything agreed.
Continue maintaining the repair and meter records without repeatedly rewriting the original application. A useful file should show the evidence available at each stage and what was later corrected or added. That is more persuasive and easier to review than a final narrative which hides how the facts became known.
When a leak investigation is still needed
If unresolved water loss is preventing you from establishing that the leak has stopped, send Leak Fix London the repair history and current symptoms. We can discuss whether a water-leak investigation and repair is appropriate. Include the previous contractor's findings so the next visit addresses a defined question.
Our work is charged at £150 per hour; if we do not find the leak, you do not pay for time spent looking. See the pricing and scope. We can document work we actually perform, but Thames Water decides the allowance. A rejected application alone is not a reason to buy another detection visit where the leak is already repaired and the disagreement is purely administrative.
For help assembling the original application rather than challenging a refusal, use our official allowance-form guide. Keep this page for the review stage: the objective is to answer the stated reason with the right evidence and route, not simply generate more paperwork.
