CO4 is one of Essex's fastest-growing new build zones - and London Clay ground conditions mean defects need catching early








CO4 covers North Colchester - Highwoods, Mile End, Braiswick and the fast-expanding Chesterwell urban extension. Over 3,000 new homes have been built or are under construction in this postcode, from Mersea Homes' 1,600-home Chesterwell masterplan to the Severalls regeneration site on the former hospital grounds. Our inspectors have documented defects in properties across every phase of these developments.
The ground conditions here matter. CO4 sits on London Clay with glacial drift deposits - a combination that causes foundations to shift as the clay shrinks in dry summers and swells in wet winters. On brownfield plots like Northern Gateway and parts of Severalls, made ground adds an additional variable. These conditions show up in new builds as step cracking at window jambs, displaced drainage runs and poorly fitting external doors - exactly the defects our inspection covers.
Our inspectors check 500+ items across every room, roof space, external envelope and services installation. You receive a timestamped photographic report the same week, structured for direct submission to your housebuilder under the New Homes Quality Code.

£344,567
Average House Price
£468,584
Detached Average
35% of CO4 stock
24,403
Households in CO4
Population growing at 2% per year
From £439
Snagging Survey Cost
3-bed house in CO4
Source: ONS Census 2021. CO4 has a higher detached and semi-detached share than central Colchester postcodes, reflecting the suburban character of Highwoods and Chesterwell.
The Chesterwell development off Cordelia Drive (CO4 6AZ) is the largest active housebuilding programme in North Colchester. Mersea Homes are delivering up to 1,600 homes across four phases - Chesterwell Park, Chesterwell Fairways, Chesterwell Grove and the premium Chesterwell Oaks. Prices range from £380,000 for a 3-bed to over £1.1m for the largest 5-bed plots. Multiple phases are selling simultaneously, which means buyers are often moving into homes where construction is still active on adjacent plots.
The Severalls regeneration site - on the former Severalls Hospital grounds - has produced over 1,200 homes and is now largely complete. Properties on this site sit on made ground from the hospital demolition and landscaping works. Our inspectors look specifically at drainage gradients and subfloor ventilation on these plots, where variable compaction can affect how drainage falls have settled over time.
Bellway's Hollytree Walk off Bromley Road (CO4 3JF) built 145 homes and is now in its final phases. If you are buying a last-plot property from any of these developments, a snagging survey becomes especially important - snag lists submitted near the end of a development's life are often prioritised differently by site managers, and having an independent report gives you a formal record.

CO4 sits on London Clay with overlying glacial drift deposits - one of the most active shrink-swell geologies in England. During the dry summers of 2022, 2023 and 2024, subsidence claims across Essex rose sharply as London Clay dried and contracted. For new builds, this manifests as step cracking at door and window openings, out-of-square internal door frames and drainage pipes that have shifted in their trenches. On Severalls and Northern Gateway brownfield plots, made ground from demolition infill adds a further variable - these sites require the deeper foundation checking our inspectors routinely carry out. Always request your housebuilder's structural completion certificate alongside your snagging report.
Our inspectors cover every accessible element of the property during a CO4 snagging survey. Given the volume of Mersea Homes and Bellway completions in this postcode, our team has direct experience of the most common defect patterns that appear in this area.
On Chesterwell properties, we pay particular attention to the boundary treatment details - fencing posts and concrete spurs are among the most commonly incomplete items on handover. Under the New Homes Quality Code (NHQB), your builder must address all legitimate snags within 30 days of receipt of your report.
CO4 pricing based on Homemove standard rates for Essex. National average from HOA.org.uk 2024 survey. Prices exclude VAT. For Chesterwell Oaks and Braiswick luxury properties, request a bespoke quote.
CO4's dominant housing era is the late 1980s and early 1990s - the Highwoods estate was built rapidly following the opening of Highwoods Country Park in 1988. These properties are now 35 years old, and while they fall outside the typical new-build snagging window, they are at the age where cavity wall insulation has often been retrofitted, where original drainage systems show signs of root ingress from the maturing landscape, and where original UPVC windows are approaching end-of-life.
If you are purchasing a 1980s or 1990s property in Highwoods, Lexden or Parson's Heath, a RICS Level 2 Home Survey is more appropriate than a snagging survey. However, for any property completed after January 2023 in CO4 - particularly on Chesterwell or Severalls - you are entitled to a pre-completion inspection under the New Homes Quality Code, and an independent snagging report strengthens your position considerably.
The 93.7% defect rate reported in the 2024 HBF New Homes Survey is consistent with what our inspectors find in CO4: most new build purchasers in North Colchester will have between 60 and 150 snags on handover. Getting them formally documented before you move in is far more effective than trying to secure remedial works after furniture is in place.

Enter your property size and CO4 postcode online. You'll receive a fixed price immediately - no call required, no hidden extras.
Select from available slots that work around your handover date. Our inspectors operate in North Colchester throughout the week, including Saturdays.
Our inspector - familiar with the Mersea Homes and Bellway build quality standards common in CO4 - carries out a full inspection of 500+ items. The inspection typically takes 3-4 hours on a 3-bed house.
You receive a photographic defect report within 3-5 working days, formatted for direct submission to your housebuilder's customer care team under the NHQB requirements.
Submit your report to your developer. Under the New Homes Quality Code, they are required to respond within a defined period. Our report provides the clear photographic evidence needed to prevent disputes.
In CO4, expect to pay from £439 for a 3-bed house, rising to £449 for a 4-bed and £559 for a 5-bed. One-bed flats start at around £299. These prices are typical of Essex specialists like Snag List Pro and are consistent with the national average range of £320-£500. For premium Chesterwell Oaks properties above £700,000, some inspectors offer extended inspection times at higher rates - request a bespoke quote. Prices are generally quoted excluding VAT.
Chesterwell is the most active development in CO4, with Mersea Homes delivering four phases simultaneously from Cordelia Drive (CO4 6AZ). Buyers here should book a snagging survey before legal completion. The Severalls site is another area where our inspectors have found drainage and foundation-related defects, given its brownfield origins on former hospital grounds. Bellway's Hollytree Walk (CO4 3JF) is now in final phases - last-plot buyers in particular benefit from having an independent report before their solicitor completes.
Allow 3-4 hours for a standard 3-4 bed detached or semi-detached house in CO4. Given that 35% of CO4 stock is detached - a higher proportion than the national average - and many Chesterwell properties have substantial rear gardens and garages, our inspectors build in time for a thorough external check. Larger Chesterwell Oaks and Braiswick properties may require 4-5 hours. You receive the written report within 3-5 working days of the inspection.
Yes. Our inspectors carry out post-completion snagging surveys in CO4 up to two years after handover, which falls within the standard new build warranty period. If you have already moved into your Chesterwell or Severalls property but have not formally documented outstanding defects, a snagging survey report still provides the evidential basis needed to pursue your builder under their customer care obligations. Some defects - particularly in roof spaces and drainage runs - are easier to inspect before furnishings are in place, but the inspection is still highly effective post-move.
Our inspectors consistently find the following in CO4 properties: cavity wall insulation batts incorrectly positioned (leading to cold bridging at floor and ceiling junctions), external door thresholds not correctly sealed, pointing irregularities in brick courses, out-of-true internal door frames (often linked to London Clay ground movement during construction), and incomplete boundary fencing details. On Severalls plots, drainage gradient issues are particularly common where made ground has settled unevenly. Internally, the most common snags are in the kitchen and bathroom - silicon seal gaps at bath and shower trays, incorrect isolation valve positions and missing access panels.
Yes. Both Mersea Homes and Bellway are registered with the New Homes Quality Board (NHQB). Under the NHQB code, buyers are entitled to a pre-completion inspection before legal completion, and the developer must respond to submitted snag lists within a reasonable period. An independent snagging report from a qualified inspector significantly strengthens your position when submitting a formal complaint to the New Homes Ombudsman if your builder does not address defects. Our reports are formatted to meet the evidentiary requirements of the NHQB process.
North Colchester is designated as a Flood Risk Area by the Environment Agency. The Salary Brook corridor runs through parts of CO4 and can cause surface water flooding in heavy rainfall events. The elevated plateau of Highwoods has lower fluvial flood risk, but properties in lower-lying parts of CO4 near the brook should be checked against the EA's flood map. For new builds at Northern Gateway and along the Chesterwell site boundaries, our inspectors check that drainage away from the building complies with the approved drainage scheme and that any required flood resilience measures have been correctly installed.
Our CO4 reports include timestamped photographic evidence of every defect found, referenced against the property drawings and against the NHQB defect categories. Each defect is described with a severity rating and a recommended remedial action. The report is delivered as a PDF structured for direct submission to your housebuilder's customer care team. We cover every room including loft space, all external elevations, drainage access points and all services installations. Our inspector will also flag any items that need to be checked by a specialist - for example, where a structural completion certificate should be requested.
Explore our full range of property survey services across CO4 and the wider Colchester area
From £350
For 1980s and 1990s Highwoods properties - a thorough condition report covering structure, drainage and services
From £500
Full structural survey for older Mile End and Braiswick properties on London Clay ground
From £60
Energy Performance Certificate for CO4 properties - required for all sales and rentals
From £200
RICS-registered valuation for Help to Buy equity loan redemption on CO4 new builds
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CO4 is one of Essex's fastest-growing new build zones - and London Clay ground conditions mean defects need catching early
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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.