New build homes in CM5 sit on London Clay - our inspectors know exactly what to look for before your two-year warranty expires








Ongar and the wider CM5 postcode are seeing significant new build activity, with Persimmon Homes' 129-home development on Chelmsford Road now under construction, and boutique schemes like Hawthorn Close in Fyfield already selling homes from £750,000. Our inspectors work across this entire area, and we find defects on virtually every new build we visit.
The CM5 area sits on London Clay - one of the most shrink-swell-prone soils in Britain. While competent developers account for this in their foundations, our inspectors check that drainage, external ground levels and substructure details have actually been built as specified. Drainage failures and ground movement at foundation level are among the defects most likely to be missed by a standard handover inspection.
Our inspectors average around 100-150 snags per property across Essex new builds. The most valuable finding is often not cosmetic - it's the insulation gap above a doorframe, the incorrectly specified cavity closer, or the drainage fall that runs the wrong way. These are the defects that become expensive disputes if you leave them until after your two-year warranty has expired.

£480,000
Average House Price
CM5 9 sector median (Oct 2025)
152+ homes
New Build Activity
Persimmon 129 + Hawthorn Close 23 currently active
3,967
Population (Chipping Ongar)
ONS Census 2021 built-up area
River Roding
Flood Risk
EA flood storage scheme under construction to May 2027
Two very different types of new build are currently active in CM5. Understanding which type you're buying into matters for a snagging survey.
Persimmon Homes' development on land north of Chelmsford Road brings 129 homes to Ongar - a mix of one-bedroom apartments through to five-bedroom family houses, with 77 open market sales, 13 shared ownership units, and 39 affordable rented homes. Every property includes an EV charging point and is built to M4(2) accessibility standards. New footpaths and cycle routes run through the site, and Persimmon is contributing £2 million in developer contributions including £320,000 for bus service improvements. This is a large, mixed-tenure volume housebuilder scheme - the type where our inspectors typically find the most structural and envelope defects.
By contrast, Hawthorn Close in Fyfield is a premium boutique scheme of just 23 homes: three, four and five-bedroom detached and semi-detached houses from £750,000 to over £1.1 million. These carry EPC B-ratings, underfloor heating throughout, and a 10-year new build warranty. The price point doesn't eliminate snags - our inspectors find defects on premium homes too - but the nature of what we're looking for differs. On a £1 million home, the risk is finish quality, specification compliance and drainage details rather than volume build shortcuts.
The Environment Agency is currently building a flood storage area north of Shonks Mill Road in Chipping Ongar, with construction running from June 2024 through to May 2027. This follows the River Roding flooding pattern that affects properties along Ongar Road, Roding Road and the wider catchment. If you're buying on or near the floodplain, our inspectors check drainage details, DPC levels and floor-to-ground relationships as part of the standard snagging inspection. Low-lying plots near the Roding deserve additional scrutiny on any new development.
The Ongar area sits on London Clay - the same geology that gives Greater London its high subsidence claim rate and costs the UK economy an estimated £3 billion per decade in property damage. London Clay is classified by the BGS as one of the most shrinkable soil types in Britain, absorbing water readily and releasing it under dry conditions, causing measurable ground movement.
For new builds on clay, what matters most is the foundation specification and the construction of the envelope above it. Our inspectors check that drainage gradients are correct (standing water against a new build in clay soil accelerates foundation movement), that expansion gaps around hard-landscaped areas comply with the drainage design, and that the substructure has been completed as drawn.
The 2022 drought - when temperatures exceeded 40 degrees Celsius for the first time in UK records - produced clay shrinkage conditions never previously documented. Climate change is steadily increasing the frequency of extreme dry summers in south-east England. Properties built on London Clay without correct drainage details are measurably higher risk for foundation movement claims in the coming decades.

Source: ONS Census 2021, Epping Forest District. Reflects the rural and semi-rural character of CM5 with high proportion of detached family homes.
Pricing sourced from Essex-based snagging providers 2025. CM5's semi-rural location may attract a small travel supplement from some providers. Homemove pricing from £295 with no hidden travel fees for CM5.
Enter your CM5 address and property size and we'll show you pricing immediately. No obligation, no call required. Our inspectors cover all of CM5 including Chipping Ongar, Fyfield, High Ongar, Blackmore, Stondon Massey and the rural villages.
We offer inspections before legal completion (the best time) or after you've moved in. If your developer is blocking pre-completion access, we can advise on your legal rights under the Consumer Code for Housebuilders.
Our inspector typically spends three to five hours on-site for a family home, working through every room, loft space, external elevations, drainage, and mechanical systems. We use thermal imaging as standard to detect hidden insulation gaps and moisture ingress.
Within 24 hours you'll have a detailed PDF report with photographs, locations, and priority ratings for every defect found. The report is formatted for direct submission to your developer's customer care team.
Our inspectors are available to advise if your developer disputes any findings. We can also conduct a re-inspection to verify that remediation work has been completed correctly before your two-year warranty expires.
Across Essex new builds, our inspectors document a consistent set of defects that volume housebuilders and their subcontractors tend to miss or under-report at handover. In CM5, the clay geology adds a structural dimension to what is often an otherwise cosmetic list.
The Keepmoat Eccleshill case (2025) documented nationally showed missing insulation identified by thermal imaging, incorrectly fitted doors and rubble under turf - defects that passed handover inspection but failed independent snagging. CM5 buyers have the same right to independent pre-completion inspection under the Consumer Code for Housebuilders, and developers are required to facilitate access.

Snagging surveys in CM5 start from £295 for a one to two-bedroom property and range up to £499 or more for five-bedroom homes. Some providers charge a small travel supplement for the semi-rural CM5 postcode, particularly for properties in Fyfield, Blackmore or Stondon Massey. Homemove charges from £295 with no hidden travel fees across the entire CM5 area. For a Persimmon home on Chelmsford Road or a Hawthorn Close property in Fyfield, the snagging survey fee typically represents well under 0.1% of the property's purchase price.
The ideal time is before legal completion - once contracts are exchanged but before you legally own the property. At this stage, the defects remain your developer's legal responsibility and they have a clear obligation to fix them before you move in. If you've already moved in, a snagging survey is still worthwhile at any point during the first two years of your warranty period. After two years, you may still have recourse through NHBC Buildmark or similar warranty schemes for structural defects, but cosmetic and minor defects typically fall outside warranty after two years.
A thorough inspection of a three to four-bedroom family home takes approximately three to four hours on-site. Larger five-bedroom homes on schemes like Hawthorn Close in Fyfield may take up to five hours given their premium specification and the detail required to verify compliance with the design. Our inspectors do not rush. We follow a systematic room-by-room methodology, check every rooflight and loft hatch, inspect external elevations and drainage, and use thermal imaging to check insulation details that are invisible to the naked eye.
It is common for volume housebuilders to resist pre-completion access for snagging inspectors, but this is a negotiating position rather than a legal right. The Consumer Code for Housebuilders (which applies to NHBC-registered developments including Persimmon) states that developers should allow access for reasonable inspections. Many buyers in CM5 successfully negotiate pre-completion access by making a written request directly to the developer's customer care team. Our inspectors can advise on the correct wording if you encounter resistance.
The Environment Agency is currently constructing a flood storage area on Shonks Mill Road in Chipping Ongar - a £multi-million scheme running from June 2024 through May 2027 specifically to reduce downstream flood risk on the Roding. The flood warning area covers properties along Ongar Road, Roding Road and Roding Lane. Most new build sites in CM5 will have been developed away from the Flood Zone 3 boundary, but our inspectors check drainage details regardless of flood zone designation. Standing water against a new build foundation in London Clay accelerates long-term ground movement risk.
London Clay is a geological formation that underlies much of south-east England including the Ongar area. It is classified by the British Geological Survey as highly susceptible to shrink-swell behaviour - meaning it expands when wet and contracts when dry. This causes measurable ground movement, which over time can affect foundations, drainage and the fabric of the building. For new builds on London Clay, our inspectors pay particular attention to drainage gradients, DPC (damp proof course) heights, and the integrity of the substructure below the ground floor. The extreme 2022 drought - the hottest summer on UK record - demonstrated that clay shrinkage in Essex can now exceed any previously recorded level.
Your report includes a full itemised list of defects with photographs, exact locations within the property, and a priority rating for each item. The report is produced as a PDF formatted for direct submission to your developer's customer care team. It covers all internal rooms, roof space, external elevations, drainage, mechanical and electrical systems, and - for all inspections - thermal imaging data to identify insulation gaps and moisture ingress that are not visible to the naked eye. We typically identify between 50 and 150 defects on a new build across Essex, depending on build quality.
Yes. Our inspectors cover the full CM5 postcode area including Chipping Ongar, High Ongar, Fyfield, Blackmore, Stondon Massey, Bobbingworth, Moreton, and all the rural villages. The premium development at Hawthorn Close in Fyfield (23 homes, from £750,000) is a specific scheme where we have active coverage. Travel to rural CM5 addresses is included in our standard pricing with no supplements. If you're unsure whether your address is covered, the quote form will confirm immediately.
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New build homes in CM5 sit on London Clay - our inspectors know exactly what to look for before your two-year warranty expires
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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.