UK Basement Tanking Price Index
The UK Basement Tanking Price Index carries 3 published figures read from 3 sources' own pages, from 40 to 80 GBP, read 28 October 2026.
40 to 80 GBP Range of the published figures 3 published figures, not one market: read the rows
3 Published figures from 3 source pages, read 28 Oct 2026
3 of 57 Sources read that publish one 5% publish a figure at all
3 of the 57 named sources read in full publish a figure; 54 publish none, read 28 October 2026.
By system
| Breakdown | Median | Range | Sources |
|---|---|---|---|
| systemType A cementitious tanking | 45GBP | 40 to 50GBP | 2 |
| systemType C cavity drain membrane | 80GBP | 80 to 80GBP | 1 |
Every figure, with its source
One row per published figure: the figure as the source's own page publishes it, the page, and the day it was read. A figure that is not on a page we read is not on this one.
| Source | Figure | Breakdown | Read |
|---|---|---|---|
| Basement Waterproofing Cost Guide | Advanced Damp | 80GBP | Type C cavity drain membrane | 2026-10-12 |
| Basement & Cellar Tanking Cost: £50, £150/m² UK Price Guide | 50GBP | Type A cementitious tanking | 2026-10-12 |
| Basement Waterproofing Cost Estimator | Tanking & Cavity Drain | 40GBP | Type A cementitious tanking | 2026-10-28 |
The sentence each figure was read from (3)
- Basement Waterproofing Cost Guide | Advanced Damp, read 2026-10-12:
£80-£120
- Basement & Cellar Tanking Cost: £50, £150/m² UK Price Guide, read 2026-10-12:
£50 – £100
- Basement Waterproofing Cost Estimator | Tanking & Cavity Drain, read 2026-10-28:
The two retrofit systems price differently: tanking (Type A) at £40–£80/m² of treated surface suits sound masonry and lower water loads; cavity drain membranes (Type C) at £70–£140/m² — plus a £1,500–£3,500 sump pump system — are the habitable-space standard on London Clay.
Read in full, publishes no figure
54 named sources were read in full on the dates shown and print no usable figure. They are counted, never filled in.
- Basement Waterproofing Kent | Tanking & Drainage Systems, read 2026-10-28: every candidate on the page was refused
- Basement Waterproofing In Birmingham | Timberwise, read 2026-10-28: read in full and no accepted figure on the page
- Expert Basement Waterproofing Systems | Peter Cox, read 2026-10-28: read in full and no accepted figure on the page
- Basement Waterproofing in London | Timberwise, read 2026-10-28: read in full and no accepted figure on the page
- Basement and Cellar Tanking | Expert Installers Scotland, read 2026-10-28: read in full and no accepted figure on the page
- Tanking a Cellar, Basement Tanking Guide, read 2026-10-28: every candidate on the page was refused
- Basement Tanking Prices: Labour & Materials Rates | squote, read 2026-10-28: every candidate on the page was refused
- Basement Waterproofing & Tanking Specialists | London, read 2026-10-12: read in full and no accepted figure on the page
- Cost of Tanking a Cellar in 2026 - MyBuilder, read 2026-10-12: every candidate on the page was refused
- Average Cost of Basement Tanking per m² 2026 (UK), read 2026-10-28: every candidate on the page was refused
- Can I Tank My Cellar Myself? l Timberwise, read 2026-10-28: read in full and no accepted figure on the page
- Basement Waterproofing Costs UK, Tanking, Cavity Drain and How to Quote Waterproofing Work (2026) | Trade2Base Blog, read 2026-10-28: every candidate on the page was refused
- 2023 Waterproofing Cost Guide | Airtasker UK, read 2026-10-28: every candidate on the page was refused
- Tanking and Making a Cellar Dry | Homebuilding, read 2026-10-28: read in full and no accepted figure on the page
- Basement Conversion Cost in 2026: UK Price Breakdown | BookaBuilderUK.com, read 2026-10-11: every candidate on the page was refused
- Damp Proofing Cost UK 2026 | £350 to £6,000 | Less, read 2026-10-28: every candidate on the page was refused
- How Much Does Basement Tanking Cost?, read 2026-10-28: every candidate on the page was refused
- Cavity Drainage Membrane Systems | Expert Installers, read 2026-10-28: every candidate on the page was refused
- Home Page - Midland Tanking, read 2026-10-28: read in full and no accepted figure on the page
- Basement & Cellar Tanking | Expert Advice & Solutions, read 2026-10-28: read in full and no accepted figure on the page
- Basement Waterproofing Sheffield | PCA Qualified Solutions, read 2026-10-28: read in full and no accepted figure on the page
- Type A Waterproofing | Tanking Basements and Walls, read 2026-10-28: every candidate on the page was refused
- Basement Tanking Specialists | Services | Protectahome, read 2026-10-28: read in full and no accepted figure on the page
- Damp Proofing Barnsley | Sheffield | Damp2Dry - Damp Specialists, read 2026-10-28: read in full and no accepted figure on the page
- Basement Waterproofing and Basement Tanking Products, read 2026-10-28: every candidate on the page was refused
- Basement Waterproofing Glasgow | Tanking & Cavity Systems, read 2026-10-28: read in full and no accepted figure on the page
- Basement Waterproofing & Tanking Specialists | Edinburgh, read 2026-10-28: read in full and no accepted figure on the page
- How to Price Damp Proofing Jobs in the UK (2026) | Trade2Base, read 2026-10-28: every candidate on the page was refused
- How much does it cost to waterproof a basement? | Livingetc, read 2026-10-28: every candidate on the page was refused
- Damp Proofing Cost UK 2026: Rising Damp, DPC, Tanking & Survey Prices, read 2026-10-12: every candidate on the page was refused
- Basement Waterproofing: Methods, Costs & Prevention Guide, read 2026-10-28: every candidate on the page was refused
- London Waterproofing Solutions Ltd - Waterproofing in Watford, Hertfordshire, read 2026-10-28: read in full and no accepted figure on the page
- Basement Waterproofing Systems & Conversions | Richardson & Starling, read 2026-10-28: read in full and no accepted figure on the page
- Premier Waterproofing or Basement Tanking in London, read 2026-10-28: read in full and no accepted figure on the page
- Basement and Cellar Waterproofing (Tanking) solutions, read 2026-10-28: every candidate on the page was refused
- Newton Waterproofing - Tanking, Structural Waterproofing & Damp, read 2026-10-28: read in full and no accepted figure on the page
- Delta Membranes - Structural Waterproofing Manufacturer, read 2026-10-28: read in full and no accepted figure on the page
- Watertight Homes Limited - Damp proofing and timber preservation services in Wakefield, UK, read 2026-10-28: every candidate on the page was refused
- Wykamol Group | Manufacturers for the Building Industry | Wykamol, read 2026-10-28: read in full and no accepted figure on the page
- Damp Proofing Course Costs in 2026 - MyBuilder, read 2026-10-12: every candidate on the page was refused
- How much does damp proofing cost and what are the options? | Homebuilding, read 2026-10-28: every candidate on the page was refused
- Basement conversion costs: What do you need to budget? | Homebuilding, read 2026-10-11: every candidate on the page was refused
- Damp Treatment Costs by Type UK | Beams, read 2026-10-28: every candidate on the page was refused
- Basement Waterproofing London | rcbGroup, read 2026-10-28: every candidate on the page was refused
- What is the Average Cost of Tanking a Cellar? DIY vs Professional, read 2026-10-28: every candidate on the page was refused
- How much does it cost to damp proof a house? | The Page, read 2026-10-12: every candidate on the page was refused
- Cellar Waterproofing & Cellar Tanking Specialists | Damp Hero, read 2026-10-12: every candidate on the page was refused
- Damp Proofing Cost 2026: Treatment Prices UK, read 2026-10-28: every candidate on the page was refused
- Basement & Cellar Damp Proofing UK, Tanking Costs | NearMeTrades, read 2026-10-28: every candidate on the page was refused
- How Much Does Basement or Wall Tanking Cost? Key Factors, Methods & Real Value, read 2026-10-28: read in full and no accepted figure on the page
- How Much Does It Cost to Tank a Cellar? UK Price Guide, read 2026-10-28: every candidate on the page was refused
- Basement Waterproofing Cost: A Complete UK Pricing Guide - Harper Latter Architects, read 2026-10-28: every candidate on the page was refused
- Basement tanking cost calculator UK 2026 | Costwise, read 2026-10-28: every candidate on the page was refused
- Basement Waterproofing Cost in London (2026) | Build Hub | Build Hub, read 2026-10-28: every candidate on the page was refused
Methodology
Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2).
3 of the 57 named sources that could be read published a usable figure; 54 published none and are recorded as not published, never filled in; 2 could not be read (blocked, dead or unreachable) and count nowhere.
The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source in GBP (a source's median where its page yielded several accepted sentences), so N counts sources, never sentences; 328 candidate sentence(s) were refused by a reviewer with the reason recorded.
The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): the median, quartiles and range of PUBLISHED tanking prices per square metre by system (Type A cementitious tanking, Type C cavity drain membrane, external tanking) and per whole cellar, across the firms, makers and guides that publish a figure, each source counted once; beside it the share of waterproofing firms that publish any price at all
328 candidate sentences on these pages were refused by a reviewer; each refusal and its reason is recorded in the review ledger.
Sources (59)
- Basement Waterproofing Kent | Tanking & Drainage Systems(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing In Birmingham | Timberwise(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Nottingham | Free Survey | Timberwise(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing North London | Tanking Specialists(the publisher's own terms; quoted for reporting and comment)
- Expert Basement Waterproofing Systems | Peter Cox(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing in London | Timberwise(the publisher's own terms; quoted for reporting and comment)
- Basement and Cellar Tanking | Expert Installers Scotland(the publisher's own terms; quoted for reporting and comment)
- Tanking a Cellar, Basement Tanking Guide(the publisher's own terms; quoted for reporting and comment)
- Basement Tanking Prices: Labour & Materials Rates | squote(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing & Tanking Specialists | London(the publisher's own terms; quoted for reporting and comment)
- Cost of Tanking a Cellar in 2026 - MyBuilder(the publisher's own terms; quoted for reporting and comment)
- Average Cost of Basement Tanking per m² 2026 (UK)(the publisher's own terms; quoted for reporting and comment)
- Can I Tank My Cellar Myself? l Timberwise(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Costs UK, Tanking, Cavity Drain and How to Quote Waterproofing Work (2026) | Trade2Base Blog(the publisher's own terms; quoted for reporting and comment)
- 2023 Waterproofing Cost Guide | Airtasker UK(the publisher's own terms; quoted for reporting and comment)
- Tanking and Making a Cellar Dry | Homebuilding(the publisher's own terms; quoted for reporting and comment)
- Basement Conversion Cost in 2026: UK Price Breakdown | BookaBuilderUK.com(the publisher's own terms; quoted for reporting and comment)
- Damp Proofing Cost UK 2026 | £350 to £6,000 | Less(the publisher's own terms; quoted for reporting and comment)
- How Much Does Basement Tanking Cost?(the publisher's own terms; quoted for reporting and comment)
- Cavity Drainage Membrane Systems | Expert Installers(the publisher's own terms; quoted for reporting and comment)
- Home Page - Midland Tanking(the publisher's own terms; quoted for reporting and comment)
- Basement & Cellar Tanking | Expert Advice & Solutions(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Sheffield | PCA Qualified Solutions(the publisher's own terms; quoted for reporting and comment)
- Type A Waterproofing | Tanking Basements and Walls(the publisher's own terms; quoted for reporting and comment)
- Basement Tanking Specialists | Services | Protectahome(the publisher's own terms; quoted for reporting and comment)
- Damp Proofing Barnsley | Sheffield | Damp2Dry - Damp Specialists(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing and Basement Tanking Products(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Glasgow | Tanking & Cavity Systems(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing & Tanking Specialists | Edinburgh(the publisher's own terms; quoted for reporting and comment)
- How to Price Damp Proofing Jobs in the UK (2026) | Trade2Base(the publisher's own terms; quoted for reporting and comment)
- How much does it cost to waterproof a basement? | Livingetc(the publisher's own terms; quoted for reporting and comment)
- Damp Proofing Cost UK 2026: Rising Damp, DPC, Tanking & Survey Prices(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing: Methods, Costs & Prevention Guide(the publisher's own terms; quoted for reporting and comment)
- London Waterproofing Solutions Ltd - Waterproofing in Watford, Hertfordshire(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Systems & Conversions | Richardson & Starling(the publisher's own terms; quoted for reporting and comment)
- Premier Waterproofing or Basement Tanking in London(the publisher's own terms; quoted for reporting and comment)
- Basement and Cellar Waterproofing (Tanking) solutions(the publisher's own terms; quoted for reporting and comment)
- Newton Waterproofing - Tanking, Structural Waterproofing & Damp(the publisher's own terms; quoted for reporting and comment)
- Delta Membranes - Structural Waterproofing Manufacturer(the publisher's own terms; quoted for reporting and comment)
- Watertight Homes Limited - Damp proofing and timber preservation services in Wakefield, UK(the publisher's own terms; quoted for reporting and comment)
- Wykamol Group | Manufacturers for the Building Industry | Wykamol(the publisher's own terms; quoted for reporting and comment)
- Damp Proofing Course Costs in 2026 - MyBuilder(the publisher's own terms; quoted for reporting and comment)
- How much does damp proofing cost and what are the options? | Homebuilding(the publisher's own terms; quoted for reporting and comment)
- Basement conversion costs: What do you need to budget? | Homebuilding(the publisher's own terms; quoted for reporting and comment)
- Damp Treatment Costs by Type UK | Beams(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing London | rcbGroup(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Cost Estimator | Tanking & Cavity Drain(the publisher's own terms; quoted for reporting and comment)
- What is the Average Cost of Tanking a Cellar? DIY vs Professional(the publisher's own terms; quoted for reporting and comment)
- How much does it cost to damp proof a house? | The Page(the publisher's own terms; quoted for reporting and comment)
- Cellar Waterproofing & Cellar Tanking Specialists | Damp Hero(the publisher's own terms; quoted for reporting and comment)
- Damp Proofing Cost 2026: Treatment Prices UK(the publisher's own terms; quoted for reporting and comment)
- Basement & Cellar Tanking Cost: £50, £150/m² UK Price Guide(the publisher's own terms; quoted for reporting and comment)
- Basement & Cellar Damp Proofing UK, Tanking Costs | NearMeTrades(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Cost Guide | Advanced Damp(the publisher's own terms; quoted for reporting and comment)
- How Much Does Basement or Wall Tanking Cost? Key Factors, Methods & Real Value(the publisher's own terms; quoted for reporting and comment)
- How Much Does It Cost to Tank a Cellar? UK Price Guide(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Cost: A Complete UK Pricing Guide - Harper Latter Architects(the publisher's own terms; quoted for reporting and comment)
- Basement tanking cost calculator UK 2026 | Costwise(the publisher's own terms; quoted for reporting and comment)
- Basement Waterproofing Cost in London (2026) | Build Hub | Build Hub(the publisher's own terms; quoted for reporting and comment)
Cite or embed this figure
The UK Basement Tanking Price Index carries 3 published figures read from 3 sources' own pages, from 40 to 80 GBP, read 28 October 2026.
3 of the 57 named sources read in full publish a figure; 54 publish none, read 28 October 2026.
UK Basement Tanking Price Index, system Type A cementitious tanking: median 45 GBP across 2 sources, read 28 October 2026.
UK Basement Tanking Price Index, system Type C cavity drain membrane: median 80 GBP across 1 source, read 28 October 2026.
Cite as: "basementtankingcost.co.uk UK Basement Tanking Price Index", updated 2026-10-28, https://basementtankingcost.co.uk/datasets/uk-basement-tanking-price-index/.
Download the CSV (3 rows, computed 2026-10-28)