Cost garage conversion: Garage Conversion Cost Index
The median published figure in the Garage Conversion Cost Index is 13,999 GBP across 9 sources' own pages (range 5,500 to 22,000 GBP), read 12 October 2026.
- 15,500 to 8,250
- 18,250 to 11,000
- 211,000 to 13,750
- 213,750 to 16,500
- 116,500 to 19,250
- 219,250 to 22,000
Bands
| Bucket | Value |
|---|---|
| 5,500 to 8,250 | 1 figure |
| 8,250 to 11,000 | 1 figure |
| 11,000 to 13,750 | 2 figures |
| 13,750 to 16,500 | 2 figures |
| 16,500 to 19,250 | 1 figure |
| 19,250 to 22,000 | 2 figures |
9 of the 36 named sources read in full publish a figure; 27 publish none, read 12 October 2026.
The median is unchanged since 26 September 2026 (was 13,999 GBP across 9).
By type and region
| Breakdown | Median | Range | Sources |
|---|---|---|---|
| typesingle garage | 13,999GBP | 13,999 to 13,999GBP | 1 |
| typepartial | 5,500GBP | 5,500 to 5,500GBP | 1 |
| typedetached single | 20,000GBP | 20,000 to 20,000GBP | 1 |
| typeintegral | 9,600GBP | 9,600 to 9,600GBP | 1 |
| regionLondon | 18,000GBP | 18,000 to 18,000GBP | 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 |
|---|---|---|---|
| Lion & Leinster, Kent, Surrey and London guide | 22,000GBP | 2026-10-12 | |
| The Home Architect, Scottish garage conversion guide | 20,000GBP | detached single | 2026-10-12 |
| The Extension Company, London garage conversion cost | 18,000GBP | London | 2026-10-12 |
| Expert Garage Conversions | 15,000GBP | 2026-10-12 | |
| CK Garage Conversions, prices | 13,999GBP | single garage | 2026-10-12 |
| Doherty Builders, garage conversion cost | 13,000GBP | 2026-10-12 | |
| Garage Conversions UK, guide price | 12,000GBP | 2026-10-12 | |
| houseUP, garage conversion cost guide | 9,600GBP | integral | 2026-10-12 |
| Pro Garage Conversions | 5,500GBP | partial | 2026-10-12 |
The sentence each figure was read from (9)
- Lion & Leinster, Kent, Surrey and London guide, read 2026-10-12:
High-spec (bedroom with en-suite, or self-contained annexe) £22,000–£35,000+ 6–10 weeks, longer if planning permission is required
- The Home Architect, Scottish garage conversion guide, read 2026-10-12:
Expect costs starting from around £20,000 (£1,333 per m²) to renovate a standalone 15m² single garage.
- The Extension Company, London garage conversion cost, read 2026-10-12:
Quick answer: Converting a London garage costs £18,000-£35,000 in 2026 — roughly half the price of an equivalent new extension — takes 6-10 weeks, and rarely needs planning permission.
- Expert Garage Conversions, read 2026-10-12:
Medium-sized garage conversion projects, including additional bedrooms, utility rooms, gyms, and multi-purpose living spaces, typically range from £15,000 to £30,000 depending on the specification and services required.
- CK Garage Conversions, prices, read 2026-10-12:
Our garage conversion prices start from £8999 for a partial garage conversion, £13,999 for a single garage conversion and £18999 for a double garage conversion.
- Doherty Builders, garage conversion cost, read 2026-10-12:
Mid-range pricing £13,000 – £22,000
- Garage Conversions UK, guide price, read 2026-10-12:
START WITH A GUIDE PRICE £12k–£23k
- houseUP, garage conversion cost guide, read 2026-10-12:
Integral garages start from around £9,600, detached double garages with plumbing can exceed £46,000, and most projects work out at £1,440–£1,920 per m² for a standard finish.
- Pro Garage Conversions, read 2026-10-12:
However, some of the simplest partial conversions fall between the £5,500 and £8,500 price range – usually things that do not involve many extra materials to set up.
Read in full, publishes no figure
27 named sources were read in full on the dates shown and print no usable figure. They are counted, never filled in.
- Fixiz Building & Maintenance, London cost, read 2026-10-12: every candidate on the page was refused
- Hipco Yorkshire, garage conversions, read 2026-10-12: read in full and no accepted figure on the page
- West Yorkshire Garage Conversions, read 2026-09-12: read in full and no accepted figure on the page
- JRM Cellar Conversions, garage conversion Leeds, read 2026-09-12: read in full and no accepted figure on the page
- CK Architectural Leeds, garage conversions, read 2026-09-12: read in full and no accepted figure on the page
- The Conversion Kings, budget breakdown, read 2026-09-12: every candidate on the page was refused
- RenovationCosts, garage conversion cost, read 2026-09-12: every candidate on the page was refused
- First4Estimating, garage conversion costs, read 2026-10-12: every candidate on the page was refused
- MixDesignCalc, garage conversion cost, read 2026-09-12: every candidate on the page was refused
- RenoCost, garage conversion cost, read 2026-10-12: every candidate on the page was refused
- GetMaster, garage conversion cost and planning guide, read 2026-09-12: every candidate on the page was refused
- MyBuildAlly, garage conversion cost, read 2026-10-12: every candidate on the page was refused
- BestBuilders, garage conversion cost, read 2026-10-12: every candidate on the page was refused
- MyJobQuote, garage conversion cost, read 2026-10-12: every candidate on the page was refused
- BookaBuilderUK, single vs double guide, read 2026-09-12: every candidate on the page was refused
- MyBuilder, garage conversion price guide, read 2026-10-12: every candidate on the page was refused
- Amber Home Improvements, Norfolk, Suffolk, Cambs, read 2026-09-12: read in full and no accepted figure on the page
- Lawsons Lofts, Sussex, Surrey, Kent, read 2026-09-12: read in full and no accepted figure on the page
- Croft Garage Conversions, Surrey, Berkshire, Hampshire, read 2026-10-12: read in full and no accepted figure on the page
- Southern Garage Conversions, read 2026-09-12: read in full and no accepted figure on the page
- County Garage Conversions, Berkshire, Hampshire, Surrey, read 2026-09-12: read in full and no accepted figure on the page
- CK Architectural, garage conversions, read 2026-09-12: read in full and no accepted figure on the page
- CR Design Services, garage conversions, read 2026-09-12: read in full and no accepted figure on the page
- MTP Builders, West Midlands, read 2026-10-12: read in full and no accepted figure on the page
- Garage Conversion Gurus, Manchester, read 2026-09-12: read in full and no accepted figure on the page
- North East Garage Conversions, read 2026-09-12: read in full and no accepted figure on the page
- the converter universe, read 2026-09-11: read in full and no accepted figure on the page
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).
9 of the 36 named sources that could be read published a usable figure; 27 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; 172 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, minimum and maximum published price per garage type (integral, attached, detached; single, double, partial) and per region, across every converter that publishes one, beside the per-square-metre rate implied by each; the SHARE of converters publishing a price at all against quote-after-survey, which is the number this market hides; the regional premium measured from converters' own pages rather than asserted as '15-25% in the South East'; repriced-since the previous read.
Counted beside the prices, the four inclusions this trade almost never itemises: whether the FLOOR build-up is in the price, whether the BUILDING CONTROL application and fee are, whether making good the door opening in matching brick is, and whether a price is published at all.
172 candidate sentences on these pages were refused by a reviewer; each refusal and its reason is recorded in the review ledger.
Sources (38)
- Expert Garage Conversions(the publisher's own terms; quoted for reporting and comment)
- CK Garage Conversions, prices(the publisher's own terms; quoted for reporting and comment)
- Garage Conversions UK, guide price(the publisher's own terms; quoted for reporting and comment)
- Pro Garage Conversions(the publisher's own terms; quoted for reporting and comment)
- Doherty Builders, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- The Extension Company, London garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- Fixiz Building & Maintenance, London cost(the publisher's own terms; quoted for reporting and comment)
- Lion & Leinster, Kent, Surrey and London guide(the publisher's own terms; quoted for reporting and comment)
- Hipco Yorkshire, garage conversions(the publisher's own terms; quoted for reporting and comment)
- West Yorkshire Garage Conversions(the publisher's own terms; quoted for reporting and comment)
- JRM Cellar Conversions, garage conversion Leeds(the publisher's own terms; quoted for reporting and comment)
- CK Architectural Leeds, garage conversions(the publisher's own terms; quoted for reporting and comment)
- The Home Architect, Scottish garage conversion guide(the publisher's own terms; quoted for reporting and comment)
- Clyde Windows, Scotland cost guide(the publisher's own terms; quoted for reporting and comment)
- The Conversion Kings, budget breakdown(the publisher's own terms; quoted for reporting and comment)
- RenovationCosts, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- First4Estimating, garage conversion costs(the publisher's own terms; quoted for reporting and comment)
- MixDesignCalc, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- houseUP, garage conversion cost guide(the publisher's own terms; quoted for reporting and comment)
- RenoCost, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- GetMaster, garage conversion cost and planning guide(the publisher's own terms; quoted for reporting and comment)
- MyBuildAlly, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- BestBuilders, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- Checkatrade, garage conversion cost guide(the publisher's own terms; quoted for reporting and comment)
- MyJobQuote, garage conversion cost(the publisher's own terms; quoted for reporting and comment)
- BookaBuilderUK, single vs double guide(the publisher's own terms; quoted for reporting and comment)
- MyBuilder, garage conversion price guide(the publisher's own terms; quoted for reporting and comment)
- Amber Home Improvements, Norfolk, Suffolk, Cambs(the publisher's own terms; quoted for reporting and comment)
- Lawsons Lofts, Sussex, Surrey, Kent(the publisher's own terms; quoted for reporting and comment)
- Croft Garage Conversions, Surrey, Berkshire, Hampshire(the publisher's own terms; quoted for reporting and comment)
- Southern Garage Conversions(the publisher's own terms; quoted for reporting and comment)
- County Garage Conversions, Berkshire, Hampshire, Surrey(the publisher's own terms; quoted for reporting and comment)
- CK Architectural, garage conversions(the publisher's own terms; quoted for reporting and comment)
- CR Design Services, garage conversions(the publisher's own terms; quoted for reporting and comment)
- MTP Builders, West Midlands(the publisher's own terms; quoted for reporting and comment)
- Garage Conversion Gurus, Manchester(the publisher's own terms; quoted for reporting and comment)
- North East Garage Conversions(the publisher's own terms; quoted for reporting and comment)
- the converter universe(the publisher's own terms; quoted for reporting and comment)
Cite or embed this figure
Cite or embed this figure
The median published figure in the Garage Conversion Cost Index is 13,999 GBP across 9 sources' own pages (range 5,500 to 22,000 GBP), read 12 October 2026.
9 of the 36 named sources read in full publish a figure; 27 publish none, read 12 October 2026.
Garage Conversion Cost Index, type single garage: median 13,999 GBP across 1 source, read 12 October 2026.
Garage Conversion Cost Index, type partial: median 5,500 GBP across 1 source, read 12 October 2026.
Garage Conversion Cost Index, type detached single: median 20,000 GBP across 1 source, read 12 October 2026.
Garage Conversion Cost Index, type integral: median 9,600 GBP across 1 source, read 12 October 2026.
Garage Conversion Cost Index, region London: median 18,000 GBP across 1 source, read 12 October 2026.
The median is unchanged since 26 September 2026 (was 13,999 GBP across 9).
Cite as: "Roofing Quotes UK Garage Conversion Cost Index", updated 2026-10-21, https://roofingquotesuk.com/datasets/garage-conversion-cost-index/.
Download the CSV (9 rows, computed 2026-10-21)