{ "name": "Roofing Quotes UK Conversion Use and Value", "title": "Conversion Use and Value", "url": "https://roofingquotesuk.com/datasets/conversion-use-and-value/", "csv": "https://roofingquotesuk.com/datasets/conversion-use-and-value.csv", "markdown": "https://roofingquotesuk.com/datasets/conversion-use-and-value/index.md", "computed_at": "2026-10-21", "license": "https://roofingquotesuk.com/terms", "headline": "The Conversion Use and Value carries 18 published figures read from 3 sources' own pages, from 4,000 to 60,000 GBP, read 12 October 2026.", "quotes": [ "The Conversion Use and Value carries 18 published figures read from 3 sources' own pages, from 4,000 to 60,000 GBP, read 12 October 2026.", "3 of the 18 named sources read in full publish a figure; 15 publish none, read 12 October 2026.", "Conversion Use and Value, use office: median 8,000 GBP across 3 sources, read 12 October 2026.", "Conversion Use and Value, use gym: median 10,000 GBP across 2 sources, read 12 October 2026.", "Conversion Use and Value, use bedroom: median 16,000 GBP across 3 sources, read 12 October 2026.", "Conversion Use and Value, use entertainment: median 10,000 GBP across 1 source, read 12 October 2026.", "Conversion Use and Value, use playroom: median 8,500 GBP across 2 sources, read 12 October 2026.", "Conversion Use and Value, use utility: median 4,000 GBP across 1 source, read 12 October 2026.", "Conversion Use and Value, use annexe: median 35,000 GBP across 3 sources, read 12 October 2026.", "Conversion Use and Value, use guest suite: median 25,000 GBP across 1 source, read 12 October 2026.", "Conversion Use and Value, use living room: median 13,000 GBP across 1 source, read 12 October 2026." ], "citation": "\"Roofing Quotes UK Conversion Use and Value\", updated 2026-10-21, https://roofingquotesuk.com/datasets/conversion-use-and-value/.", "changed_since": null, "national": { "unit": "GBP", "n": 17, "median": 14000, "min": 4000, "max": 60000, "p25": 7500, "p75": 21500, "mean": 17058.8235, "units": { "GBP": 17 }, "published_sources": 3, "named_sources": 19, "read_sources": 18, "not_published": 15, "published_share": 0.167 }, "by_axis": { "use": { "office": { "GBP": { "n": 3, "median": 8000, "min": 7000, "max": 14000, "p25": 7000, "p75": 14000, "mean": 9666.6667 } }, "gym": { "GBP": { "n": 2, "median": 10000, "min": 5000, "max": 15000, "p25": null, "p75": null, "mean": 10000 } }, "bedroom": { "GBP": { "n": 3, "median": 16000, "min": 15000, "max": 18000, "p25": 15000, "p75": 18000, "mean": 16333.3333 } }, "entertainment": { "GBP": { "n": 1, "median": 10000, "min": 10000, "max": 10000, "p25": 10000, "p75": 10000, "mean": 10000 } }, "playroom": { "GBP": { "n": 2, "median": 8500, "min": 6000, "max": 11000, "p25": null, "p75": null, "mean": 8500 } }, "utility": { "GBP": { "n": 1, "median": 4000, "min": 4000, "max": 4000, "p25": 4000, "p75": 4000, "mean": 4000 } }, "annexe": { "GBP": { "n": 3, "median": 35000, "min": 28000, "max": 60000, "p25": 28000, "p75": 60000, "mean": 41000 } }, "guest suite": { "GBP": { "n": 1, "median": 25000, "min": 25000, "max": 25000, "p25": 25000, "p75": 25000, "mean": 25000 } }, "living room": { "GBP": { "n": 1, "median": 13000, "min": 13000, "max": 13000, "p25": 13000, "p75": 13000, "mean": 13000 } } } }, "rows": [ { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£14,000 ", "value": 14000, "unit": "GBP", "vat": null, "axis": { "use": "office" }, "retrieved_at": "2026-10-12", "quote": "A simple single-garage office conversion can be done for £14,000 to £20,000 at a comfortable finish.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" }, { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£15,000 ", "value": 15000, "unit": "GBP", "vat": null, "axis": { "use": "gym" }, "retrieved_at": "2026-10-12", "quote": "Budget from £15,000 for a functional fit-out; add mirrors, cable management, and specialist flooring for a high-end result.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" }, { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£16,000 ", "value": 16000, "unit": "GBP", "vat": null, "axis": { "use": "bedroom" }, "retrieved_at": "2026-10-12", "quote": "Costs start at around £16,000 for a basic bedroom; a full en suite bedroom will push closer to £22,000 to £28,000.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£8,000", "value": 8000, "unit": "GBP", "vat": null, "axis": { "use": "office" }, "retrieved_at": "2026-10-12", "quote": "Room Type Typical Cost Build Time Permit Needed Value Impact Home Office £8,000–£25,000 4–8 weeks Building regs Good", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£15,000", "value": 15000, "unit": "GBP", "vat": null, "axis": { "use": "bedroom" }, "retrieved_at": "2026-10-12", "quote": "Guest Bedroom £15,000–£40,000 6–10 weeks Building regs Excellent", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£5,000", "value": 5000, "unit": "GBP", "vat": null, "axis": { "use": "gym" }, "retrieved_at": "2026-10-12", "quote": "Home Gym £5,000–£15,000 2–5 weeks Usually not Moderate", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£10,000", "value": 10000, "unit": "GBP", "vat": null, "axis": { "use": "entertainment" }, "retrieved_at": "2026-10-12", "quote": "Entertainment Room £10,000–£30,000 4–8 weeks Building regs Good", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£6,000", "value": 6000, "unit": "GBP", "vat": null, "axis": { "use": "playroom" }, "retrieved_at": "2026-10-12", "quote": "Playroom or Hobby Room £6,000–£18,000 3–6 weeks Building regs Moderate", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£4,000", "value": 4000, "unit": "GBP", "vat": null, "axis": { "use": "utility" }, "retrieved_at": "2026-10-12", "quote": "Boot Room or Utility £4,000–£10,000 2–4 weeks Often not Moderate", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Fifi McGee, architect explains garage conversion costs", "url": "https://fifimcgee.co.uk/blog/garage-conversion-costs", "figure": "£7,000 ", "value": 7000, "unit": "GBP", "vat": null, "axis": { "use": "office" }, "retrieved_at": "2026-10-12", "quote": "A garage-to-office conversion can be an extremely affordable option with a budget of £7,000 to £12,000 and can be much less if you are resourceful and partake in some DIY.", "source_class": "primary-provider-own-site", "text_sha256": "57006265bd32703294b23300bdb182c248b17a15a34068a74d954d973454131f" }, { "source": "Fifi McGee, architect explains garage conversion costs", "url": "https://fifimcgee.co.uk/blog/garage-conversion-costs", "figure": "£18,000 ", "value": 18000, "unit": "GBP", "vat": null, "axis": { "use": "bedroom" }, "retrieved_at": "2026-10-12", "quote": "Garages can be a fantastic opportunity to provide an extra bedroom to your property as long as you are aware of the planning permission requirements. Bedrooms will normally come in at a higher bracket of £18,000 - £28,000 assuming the following:", "source_class": "primary-provider-own-site", "text_sha256": "57006265bd32703294b23300bdb182c248b17a15a34068a74d954d973454131f" }, { "source": "Fifi McGee, architect explains garage conversion costs", "url": "https://fifimcgee.co.uk/blog/garage-conversion-costs", "figure": "£28,000 ", "value": 28000, "unit": "GBP", "vat": null, "axis": { "use": "annexe" }, "retrieved_at": "2026-10-12", "quote": "These can range anywhere from £28,000 upwards depending on how much you include in the project, this can include:", "source_class": "primary-provider-own-site", "text_sha256": "57006265bd32703294b23300bdb182c248b17a15a34068a74d954d973454131f" }, { "source": "Complete Property, garage conversion room ideas", "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "figure": "£60,000", "value": 60000, "unit": "GBP", "vat": null, "axis": { "use": "annexe" }, "retrieved_at": "2026-10-12", "quote": "ADU or Self-Contained Suite £60,000+ 12–20 weeks Planning + regs Excellent", "source_class": "primary-provider-own-site", "text_sha256": "480f86200b6cac01b77da8fa25f5dcb6f55da05fea8e3e91bbb5e34c06504288" }, { "source": "Fifi McGee, architect explains garage conversion costs", "url": "https://fifimcgee.co.uk/blog/garage-conversion-costs", "figure": "£28,000 ", "value": 28000, "unit": "GBP", "vat": null, "axis": { "use": "annexe" }, "retrieved_at": "2026-10-12", "quote": "Annexe spaces, which include extensions and additional amenities, can start from £28,000 and go upwards, depending on the project scope.", "source_class": "primary-provider-own-site", "text_sha256": "57006265bd32703294b23300bdb182c248b17a15a34068a74d954d973454131f" }, { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£25,000 ", "value": 25000, "unit": "GBP", "vat": null, "axis": { "use": "guest suite" }, "retrieved_at": "2026-10-12", "quote": "Total cost typically £25,000 to £40,000.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" }, { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£13,000 ", "value": 13000, "unit": "GBP", "vat": null, "axis": { "use": "living room" }, "retrieved_at": "2026-10-12", "quote": "Costs from £13,000 to £22,000 depending on finish.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" }, { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£11,000 ", "value": 11000, "unit": "GBP", "vat": null, "axis": { "use": "playroom" }, "retrieved_at": "2026-10-12", "quote": "Rubber or vinyl flooring, built-in toy storage, and a half-glazed stable-style external door that lets in light while keeping small children contained are practical choices. Budget £11,000 to £18,000.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" }, { "source": "houseUP, 20 garage conversion ideas", "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "figure": "£35,000 ", "value": 35000, "unit": "GBP", "vat": null, "axis": { "use": "annexe" }, "retrieved_at": "2026-10-12", "quote": "Costs start at £35,000 and can exceed £65,000 for a full design-and-build project.", "source_class": "secondary", "text_sha256": "530a6d8b9c62f5648d4eedec95823059e7d9bb63457543fd151683fd58daaf34" } ], "not_published": [ { "source": "North East Garage Conversions, house valuation", "url": "https://northeastgarageconversions.co.uk/increase-house-valuation/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Horts (estate agent), garage conversions and value", "url": "https://www.horts.co.uk/news/how-to-add-value-to-your-home-garage-conversions.html", "retrieved_at": "2026-09-12", "reason": "every candidate on the page was refused" }, { "source": "Designer Garden Rooms, value added", "url": "https://www.designergardenrooms.co.uk/blog/how-much-does-a-garage-conversion-add-to-house-value", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "House of Construction, loft against garage", "url": "https://www.houseofconstruction.uk/loft-conversions-vs-garage-conversions/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "HM Land Registry, UK House Price Index", "url": "https://landregistry.data.gov.uk/app/ukhpi/", "retrieved_at": "2026-10-17", "reason": "every candidate on the page was refused" }, { "source": "HM Land Registry, open data", "url": "https://landregistry.data.gov.uk/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "HM Land Registry, Price Paid Data standard reports", "url": "https://landregistry.data.gov.uk/app/standard-reports/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "ONS, housing", "url": "https://www.ons.gov.uk/peoplepopulationandcommunity/housing", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "ONS, median price paid by ward (HPSSA dataset 37)", "url": "https://www.ons.gov.uk/peoplepopulationandcommunity/housing/datasets/medianpricepaidbywardhpssadataset37", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "MyBuilder, garage conversion ideas", "url": "https://www.mybuilder.com/conversions/articles/garage-conversion-ideas", "retrieved_at": "2026-09-12", "reason": "every candidate on the page was refused" }, { "source": "More Living Space, garage conversion case studies", "url": "https://morelivingspace.co.uk/case-studies/page/2/", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "DJL Home Improvements, garage conversion ideas", "url": "https://www.djluk.co.uk/garage-conversion-ideas/", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "The Garage Conversion Specialist (Nottingham, Derby, Leicester), ideas", "url": "https://thegarageconversionspecialist.com/10-garage-conversion-ideas-to-inspire-your-next-project/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "All Well Property Services, office, gym or annexe", "url": "https://allwellpropertyservices.co.uk/blog/garage-conversion-ideas", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Designs in Detail, architect design inspiration", "url": "https://www.designsindetail.com/articles/garage-conversion-ideas-uk-architect-design-inspiration", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" } ], "sources": [ { "url": "https://www.checkatrade.com/blog/expert-advice/garage-conversion-add-value/", "label": "Checkatrade, does a garage conversion add value", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://northeastgarageconversions.co.uk/increase-house-valuation/", "label": "North East Garage Conversions, house valuation", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.horts.co.uk/news/how-to-add-value-to-your-home-garage-conversions.html", "label": "Horts (estate agent), garage conversions and value", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.designergardenrooms.co.uk/blog/how-much-does-a-garage-conversion-add-to-house-value", "label": "Designer Garden Rooms, value added", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.houseofconstruction.uk/loft-conversions-vs-garage-conversions/", "label": "House of Construction, loft against garage", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://landregistry.data.gov.uk/app/ukhpi/", "label": "HM Land Registry, UK House Price Index", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://landregistry.data.gov.uk/", "label": "HM Land Registry, open data", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://landregistry.data.gov.uk/app/standard-reports/", "label": "HM Land Registry, Price Paid Data standard reports", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.ons.gov.uk/peoplepopulationandcommunity/housing", "label": "ONS, housing", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.ons.gov.uk/peoplepopulationandcommunity/housing/datasets/medianpricepaidbywardhpssadataset37", "label": "ONS, median price paid by ward (HPSSA dataset 37)", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.houseup.co.uk/news/garage-conversion-ideas", "label": "houseUP, 20 garage conversion ideas", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.mybuilder.com/conversions/articles/garage-conversion-ideas", "label": "MyBuilder, garage conversion ideas", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://morelivingspace.co.uk/case-studies/page/2/", "label": "More Living Space, garage conversion case studies", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.djluk.co.uk/garage-conversion-ideas/", "label": "DJL Home Improvements, garage conversion ideas", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://thegarageconversionspecialist.com/10-garage-conversion-ideas-to-inspire-your-next-project/", "label": "The Garage Conversion Specialist (Nottingham, Derby, Leicester), ideas", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://allwellpropertyservices.co.uk/blog/garage-conversion-ideas", "label": "All Well Property Services, office, gym or annexe", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://complete-property.co.uk/garage-conversion-room-ideas-your-2026-guide/", "label": "Complete Property, garage conversion room ideas", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://fifimcgee.co.uk/blog/garage-conversion-costs", "label": "Fifi McGee, architect explains garage conversion costs", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.designsindetail.com/articles/garage-conversion-ideas-uk-architect-design-inspiration", "label": "Designs in Detail, architect design inspiration", "license": "the publisher's own terms; quoted for reporting and comment" } ], "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 18 named sources that could be read published a usable figure; 15 published none and are recorded as not published, never filled in; 1 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source for each breakdown it prices, in GBP (a source's median where its page yielded several accepted sentences for one breakdown), so a page that gives figures for several breakdowns gives one for each and N counts 17 figures, never sentences; 75 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 mix of USES across every completed project a converter publishes (bedroom, home office, gym, annexe, utility, studio, playroom), counted rather than listed, with the median published cost of each use from the cost index; joined to HM Land Registry price paid per postcode district, the value of the square metres gained, so the 'adds 10-20%' claim every estate agent repeats is replaced by a local, computed number with its denominator shown.", "embed": "

4,000 to 60,000 GBP

17 published figures, Conversion Use and Value, across 3 sources, read 12 October 2026

Source: Roofing Quotes UK Conversion Use and Value
" }