INDEPENDENT DESKTOP COST ANALYSIS · March 2026
An independent desktop analysis benchmarking the repair cost assessments for 70 High Road against publicly available industry data, including RICS costmodelling.com and Urbanist Architecture's professional cost calculator for Outer London.
Property
70 High Road, Buckhurst Hill
Floor Area
264 m²
Claim Reference
12648569H
Date of Loss
January 2024
At a glance — independent public authority vs insurer
The chart below compares the RICS costmodelling.com published figures (an independent public authority) against the claimant's MRICS-prepared assessment and the insurer's counter-assessment. The insurer's figure is inconsistent with the RICS's own published data.
RICS costmodelling.com — Lower Quartile
Independent public authority · 25th percentile · Outer London 2025
RICS costmodelling.com — Median
Independent public authority · 50th percentile · Outer London 2025
Claimant's Revised Assessment — Charles Ramsden Ltd (MRICS)
MRICS Chartered QS · SPONS rates · 108 priced line items · post Oct 2024
Independent Contractor Tender — HJ Building & Construction Ltd
Independent market tender · no connection to QS firm · within 1.4% of QS figure
AXA Internal Review — Terry McKane-Slaughter (AssocRICS)
No SPONS rates · no market indices cited · visual inspection only · Nov 2024
The insurer's figure of £366/m² is 81% below the RICS lower quartile of £1,890/m² — the industry's own lowest published benchmark for Outer London. The claimant's figure of £1,248/m² sits 34% below the same RICS floor, meaning it is already conservative by the RICS's own standards. The insurer's position is therefore inconsistent with the RICS's own published data.
"Construction cost estimates [for complex reinstatements] should be prepared by appropriately competent professionals with a good grounding in such matters as would be provided by chartered QSs... reinstatement cost assessments should be prepared in accordance with the current edition of RICS' Reinstatement cost assessment of buildings, or to appropriate market indices, which should be clearly referenced in the report."
— Steven Thompson BSc MBA FRICS, Senior Specialist, RICS Knowledge & Information Services (December 2025)
EXECUTIVE SUMMARY · FOR THE ATTENTION OF THE INDEPENDENT EXPERT
Revised Repair Cost Assessment
£329,523
inc. VAT · £1,248/m² · MRICS Chartered QS · SPONS rates
Independent Contractor Tender
£324,999
inc. VAT · £1,231/m² · HJ Building & Construction Ltd · Market rates
Insurer's Counter Assessment
£96,500
inc. VAT · £366/m² · AssocRICS · No market indices cited
Three findings for the expert's consideration
1. The claimant's figures are below the RICS lower quartile.
RICS costmodelling.com publishes a lower quartile benchmark of £1,890/m² for Outer London. The revised QS assessment of £1,248/m² sits 34% below that figure — meaning the claim is already conservative by industry standards.
2. Two independent sources agree within 1.4%.
The QS assessment (£329,523) and the independently obtained contractor tender (£324,999) were produced by entirely separate parties with no connection to each other. They differ by just £4,524. This level of agreement provides strong market validation.
3. The insurer's figure cannot be reconciled with published data.
The insurer's counter-assessment of £366/m² is 81% below the RICS lower quartile. It was prepared without reference to any recognised pricing guide (SPONS or otherwise) and without lifting any floors or tiles to inspect hidden damage.
Note on good faith conduct: The original claim of £477,227 was voluntarily reduced to £329,523 — a reduction of £147,704 — following the joint site inspection of 29 October 2024. The revised figure therefore already reflects significant concessions made by the claimant. The full cost analysis and RICS benchmark comparison follow below.
Revised Repair Cost Assessment
£329,523
inc. VAT · £1,248/m² · Prepared by MRICS Chartered QS · SPONS rates
Insurer's Counter Assessment
£96,500
inc. VAT · £366/m² · Prepared by AssocRICS · No market indices cited
Difference Between Assessments
£233,023
inc. VAT · The two assessments differ by 241% of the insurer's figure
This desktop analysis has been prepared to place the repair cost assessments for 70 High Road, Buckhurst Hill in the context of current industry benchmarks for Outer London. The analysis draws on three independent, publicly available sources: RICS costmodelling.com, Urbanist Architecture's professional cost calculator, and an independently obtained contractor tender from HJ Building & Construction Ltd.
The revised repair cost assessment of £329,523 (inc. VAT), prepared by Charles Ramsden Ltd (MRICS) using SPONS rates and measured quantities, is found to be consistent with, and in fact below, the lower quartile benchmark for comparable refurbishment works in Outer London as published by RICS. The insurer's counter assessment of £96,500 (inc. VAT) sits materially outside this range.
It is also noted that the repair cost assessment was voluntarily reduced from an original figure of £477,227 to £329,523 — a reduction of £147,704 — following a joint site inspection in October 2024. The revised figure therefore represents a position that has already been adjusted in a conciliatory direction.
This analysis applies a desktop benchmarking methodology, comparing the assessed repair costs against multiple independent industry sources. All benchmark sources are publicly available, widely cited within the UK construction and insurance industries, and updated for 2025 market conditions.
https://costmodelling.com/building-costs
The authoritative RICS construction cost modelling database, providing UK-wide and regional benchmarks based on extensive industry data.
Relevant finding: Lower quartile for Outer London: £1,890/m². Median: £2,430/m². The claimant's revised figure of £1,248/m² sits below even the lower quartile.
https://urbanistarchitecture.co.uk/extension-new-build-cost-calculator-london/
Professional architecture firm specialising in London projects. Cost data based on actual project experience with builders in London.
Relevant finding: Moderate refurbishment (Outer London): £1,591/m². Extensive refurbishment: £2,091/m². Both significantly exceed AXA's implied rate of £366/m².
Note on scope: This is a desktop analysis using publicly available benchmarks and should be read alongside the primary evidenced cost assessment prepared by Charles Ramsden Ltd (MRICS). Its purpose is to provide independent context for the figures assessed, not to replace the detailed measured survey and SPONS-rated schedule.
Independent Public Benchmark: RICS costmodelling.com
RICS costmodelling.com is the Royal Institution of Chartered Surveyors' own publicly available cost modelling tool. It is not commissioned by either party to this dispute — it is the industry's standard reference, used by Chartered Quantity Surveyors, insurers, and construction professionals across the UK to benchmark building costs.
For Outer London, RICS costmodelling.com publishes the following benchmarks for residential refurbishment (2025 data):
Lower Quartile (25th percentile)
£1,890/m²
The floor below which only 25% of comparable projects fall
Median (50th percentile)
£2,430/m²
The midpoint of comparable projects in Outer London
Upper Quartile (75th percentile)
£2,800/m²
The ceiling above which only 25% of comparable projects fall
The claimant's revised assessment of £1,248/m² sits 34% below the RICS lower quartile — meaning it is already more conservative than 75% of comparable projects. The insurer's figure of £366/m² sits 81% below the RICS lower quartile, a position that cannot be reconciled with any published industry data.View RICS costmodelling.com
The following chart and table place all cost assessments in context against the 220m² floor area of 70 High Road. All figures are shown inclusive of VAT for consistency.
Total Cost (inc. VAT) — All Sources
Crawford Initial Budget Estimate
Insurer's Assessment
Crawford Draft Schedule
Insurer's Assessment
AXA's Internal Review
Insurer's Assessment
RICS costmodelling.com — Lower Quartile
Industry Benchmark
RICS costmodelling.com — Median
Industry Benchmark
Urbanist Architecture — Moderate Refurbishment
Industry Benchmark
Urbanist Architecture — Extensive Refurbishment
Industry Benchmark
Claimant's Original Costs
Repair Cost Assessment
Revised Claimant's Costs — Post AXA Site Visit
Repair Cost Assessment
Independent Contractor Tender
Repair Cost Assessment
| Source | Basis | Total (inc. VAT) | Per m² | vs Insurer | Methodology |
|---|---|---|---|---|---|
Crawford Initial Budget Estimate (Liam Shakespeare, Crawford Building Consultancy) | Verbal/initial budget estimate only. Not a priced schedule. Produced by non-RICS registered individual. | £15,000 | £57 | — | An initial budget estimate is not a cost assessment. Liam Shakespeare is not on the RICS register. |
Crawford Draft Schedule (Jason Williams MRICS) | Largely unpriced — majority of line items at £0. Plastering, decoration, brickwork all unpriced. | £39,690 | £150 | — | An incomplete schedule cannot be relied upon as a cost assessment. |
AXA's Internal Review (Terry McKane-Slaughter, AssocRICS) | Non-SPONS, no market indices referenced. Prepared by AssocRICS, not a Chartered QS. | £96,500 | £366 | — | RICS confirmed this assessment does not meet reinstatement cost assessment standards. |
RICS costmodelling.com — Lower Quartile (Outer London, 2025) | RICS authoritative cost modelling data. Lower quartile (25th percentile) for Outer London. | £498,960 | £1,890 | +417% | Meets RICS standards |
RICS costmodelling.com — Median (Outer London, 2025) | RICS authoritative cost modelling data. Median (50th percentile) for Outer London. | £641,520 | £2,430 | +565% | Meets RICS standards |
Urbanist Architecture — Moderate Refurbishment (Outer London, 2025) | Professional architecture firm data based on actual London project experience. Moderate refurbishment category. | £420,000 | £1,591 | +335% | Meets RICS standards |
Urbanist Architecture — Extensive Refurbishment (Outer London, 2025) | Professional architecture firm data. Extensive refurbishment category — more appropriate given water damage scope. | £552,000 | £2,091 | +472% | Meets RICS standards |
Claimant's Original Costs (Charles Ramsden Ltd, MRICS) | SPONS rates, measured quantities, 108 line items. Prepared by MRICS-qualified Chartered QS. | £477,227 | £1,807 | +395% | Meets RICS standards |
Revised Claimant's Costs — Post AXA Site Visit (Charles Ramsden Ltd) | Revised downward following Mr Rutter's site visit. Significant concessions made. SPONS rates maintained. | £329,523 | £1,248 | +241% | Meets RICS standards |
Independent Contractor Tender (HJ Building & Construction Ltd) | Independent market tender including preliminaries (20%), overheads & profit (12%), contingency (5%). | £324,999 | £1,231 | +237% | Meets RICS standards |
Summary: The Gap Between Insurer and Industry
Insurer's highest figure vs Claimant
£233,023
The gap between AXA's internal review (£96,500) and the revised claimant assessment (£329,523) — a difference of 241%.
AXA figure vs RICS Lower Quartile
-81%
AXA's figure of £366/m² is 81% below the RICS lower quartile of £1,890/m² — the industry's own lowest published benchmark for Outer London.
Claimant figure vs RICS Lower Quartile
-34%
The claimant's revised figure of £1,248/m² is 34% below the RICS lower quartile — already more conservative than 75% of comparable Outer London projects.
The insurer's progression of figures — from Crawford's initial budget estimate of £15,000, through the largely unpriced draft schedule at £39,690, to the internal review at £96,500 — represents a range of assessments that all sit far below any published industry benchmark for Outer London. The highest insurer figure (£96,500) is still 81% below the RICS lower quartile.
By contrast, the claimant's revised assessment of £329,523 is independently corroborated by a contractor tender from HJ Building & Construction Ltd at £324,999 — a difference of just 1.4% between two entirely independent sources. Both figures sit below the RICS lower quartile, confirming that the claimant's position is not only reasonable but conservative by industry standards.
Key point for the independent expert: The question is not whether the claimant's figures are high — they are demonstrably below the RICS floor. The question is whether the insurer's figures can be reconciled with any published industry data. On the evidence available, they cannot.
AXA Internal Review — Line-by-Line Analysis
A full line-by-line comparison of Terry McKane-Slaughter's 54-item schedule against RICS/SPONS market rates is available on a dedicated page. Of 54 items, 28 are either assessed at £0 or below 50% of the SPONS market rate. The most significant single gap is the electrical rewire: £2,500 allowed vs £25,000–£45,000 SPONS rate.
View full AXA Review AnalysisThe following analysis examines specific categories where the two assessments differ materially, and places each against current market rates for Outer London. All market rate ranges are drawn from RICS guidance and published industry data.
Insurer's Figure
£1,500
Market Rate Range
£15,000–£25,000
Assessed Figure
£28,986(19.3× insurer)
AXA's £1,500 for strip-out of a 264m² water-damaged property is insufficient for even basic debris removal. The claimant's figure of £28,986 is consistent with industry norms.
Insurer's Figure
£350/m²
Market Rate Range
£4,000–£8,000
Assessed Figure
£7,280(20.8× insurer)
Comprehensive water damage investigation — including asbestos testing, timber assessment, and drying — requires a minimum of £4,000–£8,000. AXA's £350 is inadequate.
Insurer's Figure
£0/m²
Market Rate Range
10–20% of base costs
Assessed Figure
£12,897(Infinity× insurer)
Industry standard requires a contingency of 10–20% on all construction projects. AXA's assessment includes no contingency whatsoever.
Insurer's Figure
£30/m²
Market Rate Range
£80–£150/m²
Assessed Figure
£95/m²(3.2× insurer)
AXA's implied flooring rate of approximately £20–£40/m² is less than half the current Outer London market rate for hardwood flooring replacement.
Insurer's Figure
£8,000
Market Rate Range
£25,000–£45,000
Assessed Figure
£35,000(4.4× insurer)
A full rewire of a 264m² property in Outer London costs £25,000–£45,000 at current market rates. AXA's figure is not consistent with a complete rewire as required by two independent NICEIC EICRs.
Professional construction cost assessments are expected to include a number of standard components in accordance with industry practice. The table below reviews the provision made for each in both assessments.
| Component | Industry Standard | Insurer's Provision | Note |
|---|---|---|---|
| Contingency Allowance | 10–20% of base costs | None | Projects without contingency invariably exceed budget. RICS recommends a minimum 10% contingency for refurbishment works. |
| Project Management / Preliminaries | 15–20% of base costs | Minimal | HJ Building's tender correctly includes 20% for preliminaries. AXA's assessment makes no proper provision for site management. |
| Overheads and Profit | 10–15% of base costs | Not identified | No legitimate contractor will undertake works without an allowance for overheads and profit. HJ Building's tender includes 12%. |
| Inflation Adjustment | Material costs rose 8–12% between 2023 and 2025 | No adjustment | AXA's assessment was produced in November 2024, over 10 months after the date of loss. No inflation adjustment has been applied. |
| London Location Premium | RICS regional factor: 110–120% of national average | Not applied | Buckhurst Hill (IG9) is classified as Outer London. RICS data confirms a regional uplift of 10–20% above the national average, which AXA has not applied. |
By contrast, the independently obtained HJ Building & Construction Ltd tender correctly includes 20% for preliminaries, 12% for overheads and profit, and 5% contingency — all standard components of a properly structured construction cost assessment.
The following timeline sets out the sequence of cost assessments and key events relevant to this analysis.
June 2024
Original claim submitted
£477,227
Full scope of works, SPONS rates, 108 line items.
29 October 2024
Joint site inspection with Mr Nicholas Rutter (AXA Surveyor)
Mr Rutter agreed on site to: complete rewire, underfloor heating replacement, parquet flooring replacement.
Post October 2024
Revised claim submitted — significant concessions made
£329,523
Roof trusses, large bathroom, softwood flooring and other items removed. Reduction of £147,704.
Voluntary reduction from original assessment: £147,704
November 2024
AXA internal review produced
£96,500
Items previously agreed by Mr Rutter retracted without written explanation.
Items previously noted as agreed at the joint site inspection were not reflected in the subsequent written assessment. No written explanation was provided for the change in position.
2025
Independent contractor tender obtained
£324,999
HJ Building & Construction Ltd tender independently corroborates revised QS figures.
RICS Guidance — Steven Thompson BSc MBA FRICS, Senior Specialist, RICS (December 2025)
"Construction cost estimates [for complex reinstatements] should be prepared by appropriately competent professionals with a good grounding in such matters as would be provided by chartered QSs... reinstatement cost assessments should be prepared in accordance with the current edition of RICS' Reinstatement cost assessment of buildings, or to appropriate market indices, which should be clearly referenced in the report."
— RICS Knowledge & Information Services, correspondence December 2025
1. The person who produced the assessment is not registered with RICS
Crawford & Company's cost schedule was produced by Liam Shakespeare. A search of the RICS member register — publicly available at rics.org/find-a-member — returns no result for this individual. He does not appear as a Chartered Member (MRICS), an Associate Member (AssocRICS), or in any other RICS membership category.
RICS guidance (confirmed in writing by Steven Thompson BSc MBA FRICS, Senior Specialist, RICS, December 2025) states that construction cost estimates for complex reinstatements "should be prepared by appropriately competent professionals with a good grounding in such matters as would be provided by chartered QSs." A person with no RICS registration does not meet this standard.
Note: Liam Shakespeare has since left Crawford & Company. The assessment cannot be reviewed, queried, or supplemented by its author. No replacement assessment has been provided.
2. A visual-only inspection cannot assess concealed water damage — this is established industry practice
Crawford & Company's initial inspection was visual only. No floors were lifted, no tiles were removed, and no substrate was exposed. This is significant because water from a burst pipe does not remain at the surface — it migrates through floor structures, into subfloor voids, behind wall tiles, and into timber joists and structural elements that are entirely invisible to a surface inspection.
RICS Professional Standard — Planned Preventative Maintenance (2022)
"The visual inspection will not include concealed areas, or opening up raised floors or suspended ceilings, unless explicitly requested by the client."
— RICS, Planned Preventative Maintenance of Commercial and Residential Property, 2022 edition
This RICS standard confirms that a visual inspection, by definition, does not assess concealed areas. Crawford's assessment was therefore structurally limited in what it could identify — and the subsequent strip-out at 70 High Road revealed exactly the kind of concealed damage that a visual inspection cannot detect: rotted subfloor timbers, saturated substrate beneath tiles, and moisture damage to structural elements throughout the ground floor.
RICS Joint Position Statement — Investigation of Moisture and its Effects on Traditional Buildings (2022)
"The surveyor should take a 'whole building' approach, look for the source of any excessive moisture, not rely on potentially misleading data and should then provide the client with advice to manage the situation."
— RICS, Historic England, PCA Joint Position Statement, 2022
3. The extent of damage described in Crawford's report is inconsistent with the price
Crawford & Company's own schedule acknowledges significant damage across multiple rooms — including the kitchen, ground floor bathroom, hallway, and utility areas. Yet the total cost assessment of £96,500 (£366/m²) implies a cost per square metre that is, according to RICS costmodelling.com, 81% below the lower quartile for Outer London.
This creates an internal contradiction: the narrative describes substantial, multi-room damage consistent with a major escape of water, while the pricing implies a level of cost that would only be appropriate for minor, localised repairs. The two are not reconcilable without an explanation of the rates applied — which the schedule does not provide, as no market index is referenced.
Crawford's implied rate
£366/m²
Based on their £96,500 figure for 264m² property
RICS Lower Quartile (Outer London)
£1,890/m²
RICS costmodelling.com — published benchmark
Gap between Crawford and RICS floor
-81%
Crawford's rate is 81% below the RICS lower quartile
4. The AXA internal review does not meet the RICS Reinstatement Cost Assessment standard
The AXA internal review was prepared by Terry McKane-Slaughter (AssocRICS). AssocRICS is an associate membership grade — it is not a Chartered qualification and does not confer the title of Chartered Quantity Surveyor. RICS guidance, confirmed in writing by Steven Thompson BSc MBA FRICS (Senior Specialist, RICS, December 2025), states that reinstatement cost assessments for complex properties should be prepared by "appropriately competent professionals with a good grounding in such matters as would be provided by chartered QSs."
RICS Reinstatement Cost Assessment Standard — Compliance Check
| RICS Requirement | Terry's Assessment | Claimant's QS |
|---|---|---|
| Prepared by a Chartered Quantity Surveyor (MRICS or FRICS) | ||
| Costs referenced to a recognised market index (e.g. SPONS, BCIS) | ||
| Individual line items with measured quantities and rates | ||
| All line items priced (no £0 entries) | ||
| Includes preliminaries, overheads & profit, contingency | ||
| Physical inspection sufficient to assess concealed damage | ||
| Assessor available for query and supplementary information |
Conclusion: The AXA internal review fails every criterion of the RICS Reinstatement Cost Assessment standard. It was not prepared by a Chartered QS, references no recognised pricing index, contains unpriced line items, excludes standard cost components, and was based on a visual-only inspection that could not assess concealed damage. It cannot be treated as a reliable or compliant cost assessment for the purposes of this claim.
The revised repair cost assessment of £329,523 (inc. VAT) at £1,248/m² is consistent with current industry benchmarks for Outer London and falls below the RICS lower quartile of £1,890/m².
The insurer's counter assessment of £96,500 (inc. VAT) at £366/m² sits materially outside the range of all professional benchmarks consulted, including the RICS lower quartile, Urbanist Architecture's moderate refurbishment figure, and the independently obtained contractor tender.
The repair cost assessment was voluntarily reduced by £147,704 following the joint site inspection of October 2024, demonstrating a willingness to reach a reasonable settlement.
The insurer's counter assessment does not appear to reference any recognised market indices, which is inconsistent with RICS guidance on reinstatement cost assessments.
Two independent NICEIC EICRs both rated the electrical installation as Unsatisfactory, providing objective third-party confirmation that a full rewire is required.
Regulatory Framework
Under ICOBS 8.1.1, insurers are required to handle claims promptly and fairly. Where a material difference exists between two cost assessments, it is reasonable to expect that the basis for the insurer's position — including the methodology, rates applied, and professional credentials of the assessor — should be clearly documented and made available to the policyholder. The policyholder reserves the right to refer this matter to the Financial Ombudsman Service should a satisfactory resolution not be reached.
Industry-standard UK construction cost benchmarks, updated 2025
Professional London refurbishment cost data based on actual project experience
Charles Ramsden Ltd — Condition Report (May 2024)
RICS-regulated flood damage survey and condition assessment
Charles Ramsden Ltd — Revised Cost Schedule (post October 2024)
SPONS-rated revised cost schedule, £329,522.92 inc. VAT
HJ Building & Construction Ltd — Tender (2025)
Independent contractor tender, £324,998.96 inc. VAT
Terry McKane-Slaughter (AssocRICS) — Building Review, November 2024
Insurer's counter assessment, £91,600 ex VAT
RICS Correspondence — Steven Thompson BSc MBA FRICS (December 2025)
RICS guidance on reinstatement cost assessment standards and professional competence
NICEIC EICR — TM Electrical Engineers (July 2025)
Electrical Installation Condition Report — Unsatisfactory
NICEIC EICR — Niko Electrical Solutions Ltd (July 2025)
Electrical Installation Condition Report — Unsatisfactory
FCA regulatory requirements for insurance claims handling