CF82 sits above Penallta Colliery workings and beside the River Rhymney - our inspectors know what to look for in Wales's valley new builds








CF82 covers Ystrad Mynach, Hengoed, Cefn Hengoed, Penallta, Maesycwmmer, Penpedairheol and Gelligaer - a district shaped by the coal industry and now seeing steady new-build growth on former colliery land. Our inspectors have found drainage problems in gardens that sit above compacted spoil, settlement cracks at wall junctions in homes built on disturbed ground, and incomplete thermal insulation details in properties on the Cwm Calon and newer Penallta estates. Getting a snagging survey done before legal completion puts every defect on record so the developer corrects it at their cost.
The two-year NHBC or LABC warranty period is your legal window to require the developer to fix defects free of charge. Our inspectors typically find 40-100 items on a new-build, from missing mastic seals and poorly adjusted doors to cracked render and incorrect floor falls. Without a written snagging list, buyers in CF82 - like everywhere else - end up self-funding repairs that should never have been their bill.

£223,000
Average House Price
Five-year Caerphilly growth
58%
3-Bed Semis
Most common property type in Caerphilly
67.5%
Owner Occupied
Caerphilly Census 2021
~35%
Pre-1919 Stock
Estimated for CF82 valley terraces
CF82 sits directly above South Wales Coalfield workings. Penallta Colliery - which closed in November 1991 after 86 years of operation and sank two shafts reaching 783 yards depth - operated immediately adjacent to the Penallta/Hengoed part of the postcode. A CON29M coal mining search is mandatory for all property transactions in CF82 under Law Society guidance. The search covers active and historic mine workings, subsidence claims, gas emission records, shaft locations and surface hazard incidents. If you are buying a new build on the Cwm Calon estate or any Penallta development site, this search should already be part of your conveyancing pack - check with your solicitor before exchange.
The Cwm Calon estate in CF82 6 (Penallta) is the dominant source of new-build snagging instructions in this postcode. Originally developed by Redrow Homes on the reclaimed Penallta Colliery site, the estate covers a mix of apartments, townhouses and detached homes. The most recent confirmed sale on Cwm Calon Road was a semi-detached in November 2024 at £242,000. United Welsh delivered 48 new affordable homes on the adjacent former colliery land in 2022, all rated EPC Band A. Caerphilly County Borough Council has allocated further housing land at Ystrad Mynach under its replacement Local Development Plan, which targets 2,800 new homes county-wide by 2034 - making CF82 one of the principal growth settlements in the plan.
Homes built on former industrial land carry specific risks that a standard new-build inspection must address. Our inspectors check: perimeter drainage performance where gardens abut compacted fill material, sub-floor ventilation adequacy in homes over disturbed ground, and visible settlement patterns at window openings and door frames that can indicate differential movement in the first two years after construction.

Natural Resources Wales maintains an active flood warning zone for the River Rhymney at Ystrad Mynach (NRW warning code 103FWF197202). New-build developments in low-lying parts of CF82 7 near the river corridor should have formal drainage strategies approved by NRW. Our snagging inspection checks for compliance with the approved drainage scheme - blocked surface water outlets, missing soakaway inspection chambers, and inadequate garden grading are among the drainage defects our inspectors have recorded in new builds near flood-risk areas across South Wales.
Flood defences on the River Rhymney in Ystrad Mynach were erected in the 1960s, and the town was previously subject to periodic flooding before those works. NRW's Flood Map for Planning (updated May 2024) should have been consulted during the planning permission stage for any riverside or low-lying new-build. If your new home is within 50 metres of the Rhymney, your snagging inspector should be checking that all drainage connections to the adopted highway drainage system are properly made and sealed.
Source: ONS Census 2021, Wales housing type distribution. CF82 has higher proportion of semi-detached and detached than valley postcodes to the north.
The older housing stock in Gelligaer, Tir-y-Berth, Penpedairheol and Cefn Hengoed is built from Pennant Sandstone - the defining material of the South Wales coalfield valleys. Pennant is a hard, durable sandstone but it must be laid and pointed with lime mortar. Cement repointing, which was applied to thousands of valley terraces from the 1970s onwards, traps moisture in the stone and causes the chronic damp that affects a significant proportion of the existing housing stock in CF82. While snagging surveys are specifically for new builds, our inspectors' deep knowledge of South Wales construction helps them identify when a new-build in a terrace row has been built with specification shortcuts that will accelerate defects.
South Wales valleys receive up to 2,000mm of rainfall annually - roughly double the England average. In this climate, any gap in render, any unsealed junction or missing mastic detail on a new build will admit water within months. Our inspectors check every external junction, every render stop bead, and every soffit/fascia board joint on new builds in CF82.

Enter your postcode and property size online to get your CF82 snagging price. All prices include VAT and a full written report.
Select a date before legal completion if possible. We cover all CF82 developments including Cwm Calon, Penallta and Ystrad Mynach - or any date within the NHBC two-year warranty period. Our inspectors travel across South Wales.
Our inspector carries out a room-by-room internal inspection plus external walkround, checking all roof-accessible areas, drainage, groundworks and outbuildings against the developer specification.
Your written report is delivered within 48 hours of the inspection. Each defect is photographed, described and referenced to the relevant NHBC/LABC standard.
You send the report to your developer. Our team supports you if the developer disputes any items - we have clear records of what was found and when.
Prices inclusive of VAT. Inspection within NHBC two-year warranty period. Report delivered within 48 hours.
Snagging surveys in CF82 start from £295 for a one or two-bedroom flat and from £345 for a three-bedroom house. Larger four and five-bedroom homes are from £445. All prices include VAT and a full written report with photographs. The cost is typically recovered many times over in developer-funded rectification work: the average snagging report identifies 40-100 defects, each of which the developer must fix at no cost during the NHBC warranty period.
Our inspectors cover all new-build homes in CF82 including the Cwm Calon estate (Redrow, Penallta), Taylor Wimpey plots in Ystrad Mynach, and the United Welsh affordable homes on the former Penallta Colliery site. Snagging applies to any new-build property within two years of legal completion. If you are buying on a phased development where earlier phases completed before yours, your two-year clock starts from your own completion date, not the site's first completions.
A typical two or three-bedroom house snagging inspection takes two to three hours on site. A four or five-bedroom detached takes three to four hours. Our inspector checks every room, all wall and ceiling junctions, windows and door operations, mastic seals, drainage performance, heating and plumbing connections, loft insulation coverage and external render and drainage details. The written report is delivered within 48 hours of the inspection.
CF82 sits directly above the South Wales Coalfield. Penallta Colliery, which operated from 1905 to 1991 with shafts reaching 783 yards deep, is directly adjacent to the Penallta sector of the postcode. A CON29M coal mining search is mandatory for all CF82 property transactions and should be in your conveyancing pack. New-build developers on former colliery land are required to carry out ground condition surveys before planning permission is granted, but monitoring for settlement in the first two years after construction is still important - our snagging inspection documents any visible cracking at structural junctions and recommends further investigation where patterns suggest differential movement.
Yes - you can commission a snagging survey at any point within the two-year NHBC or LABC warranty period from your completion date. Many CF82 buyers commission their snagging survey three to six months after moving in, once the property has gone through its first heating season and any initial settlement is visible. Defects that emerge after you move in - sticking doors as frames settle, grout cracking as tiles bed in, condensation-related staining - are all within scope. The developer remains liable for all genuine defects notified within the warranty period.
Natural Resources Wales maintains an active flood warning zone for the River Rhymney at Ystrad Mynach (NRW code 103FWF197202). New-build developers in low-lying areas of CF82 must comply with NRW-approved drainage strategies as a planning condition. Our snagging inspection checks that surface water drainage connections are properly made and sealed, that soakaway inspection chambers are accessible and uncovered, and that garden grading directs water away from the property. If your new home is in a flood-risk area, your solicitor should also have confirmed that the appropriate flood risk assessment was completed as part of planning permission.
No - they serve different purposes. A snagging survey is for new-build properties within the NHBC two-year warranty period and focuses on identifying defects the developer should rectify at their cost. A structural survey (RICS Level 3 Building Survey) is for older properties where the buyer needs a full assessment of the building's condition before purchase. For CF82's older Pennant sandstone terraces in Gelligaer, Tir-y-Berth or Penpedairheol, a Level 3 survey is appropriate at the point of purchase. For a new build on Cwm Calon or the Penallta development sites, a snagging survey is the right product.
The NHBC Buildmark warranty gives you a formal dispute resolution route if a developer will not address notified defects. You can refer the dispute to NHBC's Resolution Service, which is free to use and typically resolves within eight weeks. Our snagging reports are drafted to NHBC standards with clear photographs and defect descriptions, making it straightforward to demonstrate what was found and when. We have supported CF82 buyers through NHBC dispute resolutions where developers initially declined to act on the report.
Our full range of property survey services across Ystrad Mynach, Hengoed and the CF82 postcode
From £395
Condition ratings and advice for typical CF82 semi-detached and terraced homes
From £595
Full structural assessment for older Pennant sandstone terraces in Gelligaer and Hengoed
From £79
Energy Performance Certificate required for any property sale or rental in CF82
From £295
RICS-certified valuations for repaying Help to Buy equity loans on CF82 properties
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CF82 sits above Penallta Colliery workings and beside the River Rhymney - our inspectors know what to look for in Wales's valley new builds
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Homemove is a trading name of HM Haus Group Ltd (Company No. 13873779, registered in England & Wales). Homemove Mortgages Ltd (Company No. 15947693) is an Appointed Representative of TMG Direct Limited, trading as TMG Mortgage Network, which is authorised and regulated by the Financial Conduct Authority (FRN 786245). Homemove Mortgages Ltd is entered on the FCA Register as an Appointed Representative (FRN 1022429). You can check registrations at NewRegister or by calling 0800 111 6768.