RICS-qualified chartered surveyors covering Bishop's Stortford and the CM20 postcode area








CM20 covers Bishop's Stortford and the surrounding area in Essex, where the average house price is in the range of £380,000 to £400,000. The area is a well-established commuter town with strong rail links to London and Cambridge, and Stansted Airport nearby is a major regional employer. With detached homes typically reaching £550,000 to £600,000 and approximately 250 to 300 residential properties sold in CM20 each year, a professional survey is an important step before committing to a purchase.
Our RICS Level 2 HomeBuyer Survey provides a thorough, independent assessment of the property's condition, rated on a traffic-light system. Condition rating 1 means no repair is required, rating 2 flags repairs needed but not urgent, and rating 3 identifies serious or urgent defects. Our written report explains each finding clearly so you know what you are buying and what, if anything, you need to do about it.
CM20 has specific conditions that buyers need to understand before purchasing. The River Stort runs through the area, creating flood risk zones along its corridor. London Clay underlies much of the postcode, presenting a moderate to high shrink-swell risk that can affect foundations. Bishop's Stortford town centre contains conservation areas and numerous listed buildings, and over 60% of properties in CM20 are more than 50 years old. Our surveyors are experienced in identifying the specific issues these conditions create.

£380k-£400k
Average House Price
£550k-£600k
Detached Average
Last 12 months
£350k-£380k
Semi-detached Average
Last 12 months
£290k-£320k
Terraced Average
Last 12 months
60-70%
Properties Over 50 Years Old
Making Level 2 surveys highly relevant
A RICS Level 2 Survey, often referred to as a HomeBuyer Report, is a detailed visual inspection carried out by one of our RICS-qualified chartered surveyors. We inspect all accessible parts of the property without lifting floorboards, opening up walls or directly testing services. From the roof down to the foundations, every visible and accessible element is assessed.
We look at the roof structure and covering from ground level, along with chimneys, gutters, rainwater drainage, external walls, windows and doors. Inside the property, we inspect ceilings, walls, floors, kitchens and bathrooms. Our surveyors use a moisture meter to pick up elevated damp readings throughout. Each part of the building is then given a condition rating under the traffic-light system, with written notes setting out what we found and what action should follow.
In CM20, more than 60 to 70% of properties are thought to be over 50 years old, which makes a Level 2 Survey relevant for a large part of the local housing stock. Across Bishop's Stortford, homes from the inter-war and post-war periods regularly show age-related defects, and these are points our surveyors check for as a matter of course on every inspection.
There is also a legal issues section in our report, where we highlight anything your solicitor should investigate further. That can include extensions or outbuildings with no apparent planning permission, alterations to listed buildings, and boundary features that are not clear. Anything urgent that needs specialist investigation before exchange of contracts is pulled into a separate summary section so it stands out.
A Level 2 Survey usually suits properties built after 1900, of conventional construction, and in broadly reasonable condition. In CM20, if a property is pre-1900, listed, heavily altered or simply in poor condition, a RICS Level 3 Building Survey is normally the better option because it goes into more detail. Not sure which level fits a particular Bishop's Stortford property, our team can talk it through before you book.
The River Stort and its tributaries pass through CM20, so fluvial flood risk zones appear along those corridors in and around Bishop's Stortford. Surface water flooding is also a known issue in parts of the area. During the inspection, our surveyors look for visible signs of flood-related damage, including tide marks, salt deposits on internal plaster, and damp penetration patterns that fit flooding rather than ordinary rising damp or penetrating damp.
Anyone buying near the River Stort should check the Environment Agency's flood risk maps as a routine part of the purchase. We would also expect your solicitor to ask the seller for flood history information and to confirm that insurance is available. Some mortgage lenders apply extra criteria where a property sits in a higher flood zone, and flood-affected homes can also face higher buildings insurance premiums.
Our survey can pick up visible signs of flood damage within the property, but a formal flood risk assessment for a CM20 home is a separate specialist exercise. We advise buyers to treat that flood risk check as something to run alongside the survey, not instead of it. Our report records the physical condition of the building, while flood risk maps and specialist flood reports deal with the wider environmental risk.
River flooding and surface water flooding are not the same thing. In CM20, surface water risk can affect homes well beyond the Stort corridor, including properties in areas with impermeable surfaces, weak drainage infrastructure or low-lying local topography. Our surveyors review the drainage arrangements visible at the property and point out any features that may add to surface water build-up.

Source: Market data as of February 2026. Figures are approximate ranges for the CM20 postcode area.
CM20 sits on geology that includes London Clay, with superficial deposits of River Terrace materials and alluvium along the river valleys. London Clay is a high-plasticity clay soil, which contracts in dry weather and swells again when wet conditions return. That shrink-swell behaviour is classed as a moderate to high risk in the area and can lead to movement beneath foundations.
Homes with shallow foundations, or those standing where clay lies close to the surface, are generally more exposed to foundation movement. The risk tends to increase during and after long dry spells because the ground contracts and foundations may lose lateral support. Once wetter weather follows, the clay expands again, and where the movement is uneven it can produce structural cracking.
During the inspection, we check external walls for diagonal cracking at corners, around door and window openings, and where different structural elements meet. Inside, we look for crack patterns in walls and ceilings as well as uneven floors. If what we see is more in keeping with foundation movement than normal settlement or thermal movement, we make that clear in the report and recommend an assessment by a structural engineer.
Mature trees are another factor in CM20 subsidence risk. Their roots draw moisture from clay soil, which can cause local shrinkage beneath foundations. Our surveyors record the position of mature trees, especially willows, poplars and oaks, where they are close enough to present a risk. Even where a tree has already been removed, the soil can retain desiccation effects for several years, and we note that as well where relevant.
A property with a history of subsidence that has been underpinned or monitored presents a different level of risk from one where movement has not been treated. Our survey looks for signs of past movement and any remedial work, both of which can influence mortgage availability and insurance premiums. We set this out in the report so buyers have the information needed to decide how they want to proceed.
In Bishop's Stortford town centre, there are conservation areas and a notable number of listed buildings, especially along historic streets and in the older parts of the town. The Town Centre Conservation Area is there to protect that historic character. Buyers looking at homes in conservation areas, or properties with listed building status, need to be aware of the restrictions and responsibilities that come with them.
Listed buildings in CM20 cannot be altered without listed building consent from East Herts District Council. That applies to extensions, replacement windows, changes to internal historic features and even some maintenance work. Where alterations appear to have been made to a listed property, our survey report highlights this and states where consent paperwork should be requested from the seller. Unauthorised works to a listed building are a criminal offence, and liability stays with the property regardless of who carried them out.
Older CM20 homes are commonly built in traditional red or yellow stock brick, with timber roof structures finished in clay or concrete tiles, and solid wall construction in pre-1930s buildings. From the 1930s onwards, cavity wall construction became the norm. These are not details to gloss over, because traditional construction needs compatible maintenance and repair methods, including lime mortar pointing, breathable coatings and suitable repair materials.
We often find older properties where previous owners have used unsuitable repair materials, such as cement pointing over lime mortar, impermeable renders over solid brick walls, or modern sealants on traditional construction. Our surveyors identify those issues and explain the consequences. Repairs of that sort can trap moisture within the structure and gradually cause deterioration that becomes more expensive to put right over time.

CM20 has seen strong housing demand for years, helped by Bishop's Stortford's rail links to London Liverpool Street and Cambridge, and by nearby Stansted Airport. The result is a competitive market where homes can move quickly. For that reason, we advise booking the survey promptly once your offer is accepted rather than leaving it until later in conveyancing, because it gives you more time to act on findings, negotiate where needed, and arrange specialist reports before exchange.
For a typical three-bedroom semi-detached house in CM20, RICS Level 2 Survey fees usually fall between £450 and £700. Across the country, Level 2 Surveys are commonly priced at £400 to £900 depending on value, size and complexity. CM20 generally sits in the mid-to-upper part of that national range, which reflects above-average property values locally and the nature of the housing stock.
The type of property makes a difference to cost. Flats and smaller homes usually sit at the lower end, around £400 to £550. Terraced houses are commonly £450 to £600, semi-detached homes £450 to £700, and detached properties £550 to £800 or more depending on size and complexity. Where a property has several extensions, unusual construction or substantial outbuildings, the inspection can take longer and the fee may be higher.
Some CM20 homes call for more than a Level 2. If the property is pre-1900 or a listed building, a RICS Level 3 Building Survey is often the more suitable choice. The fee is higher because the inspection and reporting are more detailed, but that extra depth is often exactly what is needed for older or more complicated buildings. If you are undecided, our team can advise before you book.
Set against CM20 purchase prices, a survey fee is modest. Flats can be around £190,000, while a detached home may be £600,000 or above, so the cost of the survey is usually a sensible investment. If we identify a serious defect, that can support a renegotiation worth far more than the survey itself, and if the report is satisfactory it still gives buyers confidence to move ahead while recording the property's condition at the point of purchase.
Not sure which level is right for your CM20 property? Contact our team before booking and we will advise based on the property's age, type, and condition.
To get started, complete our online quote form with the property's address, type and approximate value. We then confirm the fee and check surveyor availability in CM20, usually within a few hours on working days.
After you accept the quote, we book in an inspection date that works. In Bishop's Stortford and across the wider CM20 area, we usually aim to inspect within five to ten working days of booking, subject to surveyor availability.
One of our RICS-qualified chartered surveyors attends the property and carries out a thorough visual inspection of all accessible parts. On a standard CM20 terraced or semi-detached home, this inspection will typically take two to three hours.
We send the finished report in PDF format within three working days of the inspection. It sets out the condition ratings for all inspected elements, includes written commentary throughout, and ends with a clear summary of risks and urgent items.
Once the report has been delivered, our team can talk you through what it means. If we have identified problems, we explain how significant they are, how urgent they may be, and what steps we think should come next, including whether specialist reports ought to be obtained before exchange.
Age-related defects are common in CM20, with over 60 to 70% of properties estimated to be more than 50 years old. Damp is one of the issues we most often record, in several forms, rising damp where the damp-proof course is missing or has failed, penetrating damp caused by defective pointing or flashings, and condensation in bathrooms, kitchens and loft spaces with poor ventilation.
Roofing issues come up regularly as well. Inter-war and post-war homes may still have original tile or slate coverings that are at or beyond their expected service life. We frequently find slipped, cracked or missing tiles, defective lead flashings around chimneys, and valley gutters that are blocked or damaged. In older properties, timber roof structures can also show rot or woodworm, especially where ventilation is poor.
We also come across outdated electrical installations where original wiring has never been modernised. Visible examples can include pre-1960s wiring systems, rubber-insulated cables and consumer units without residual current devices, and where these raise concern we recommend a full Electrical Installation Condition Report from a qualified electrician. Older plumbing is noted too, including lead pipes in pre-1970s properties.

Where our report records condition rating 3 defects, meaning serious or urgent items, we advise getting specialist opinions before exchange. Structural cracking that points towards subsidence should be reviewed by a structural engineer. Concerns about the roof structure are best considered by a specialist roofing contractor. If we flag possible flood damage or damp, a specialist damp and timber surveyor can give a more detailed diagnosis.
It is common for mortgage lenders to ask for specialist reports after a survey has raised concerns. In some cases, they place a retention on the mortgage offer and hold back part of the loan until repairs are completed or the specialist investigations have been reviewed and found satisfactory. Knowing that before exchange helps buyers plan for delays and reduces the risk of pressure building close to completion.
Not every issue is urgent, but condition rating 2 findings can still be useful in negotiations. In CM20, with sale prices often in the £350,000 to £600,000 range or above depending on property type, a repair schedule costing £5,000 to £20,000 can make a real difference. Our report gives buyers evidence to support a request for a price reduction, and many sellers would rather agree an adjustment than lose the sale and put the property back on the market.
Where a listed building in CM20 shows signs of unauthorised alterations, our report gives buyers a basis for raising formal enquiries with East Herts District Council and the seller. Getting the planning and consent position clarified before exchange matters, because it helps avoid taking on legal responsibility for works carried out by a previous owner.
Our involvement does not stop when the report is sent over. We remain available to answer questions and help you work through the findings. If follow-up investigation is needed in the CM20 area, from specialist contractors or engineers, we can explain what kind of specialist is appropriate, even though we do not give personal referrals to named firms.
For a typical three-bedroom semi-detached property in CM20, a RICS Level 2 Survey generally costs between £450 and £700. Flats are often towards the lower end at around £400 to £550, while larger detached homes may be £550 to £800 or above depending on size and complexity. The exact figure comes down to the property's type, size and value, so the quickest way to get a confirmed price is to use our online quote form for your specific CM20 property before you commit. National averages put a typical Level 2 Survey at £400 to £900 across all regions.
We cover the whole CM20 postcode area. That includes Bishop's Stortford town centre, surrounding residential neighbourhoods and the rural parts of the postcode. Our surveyors inspect the full spread of local property types, from Victorian and Edwardian terraces in the older parts of Bishop's Stortford to inter-war semi-detached houses, post-war estates and newer residential developments. We also inspect homes near the River Stort corridor, where flood risk awareness is especially important.
On a standard CM20 semi-detached or terraced property, the inspection itself usually takes two to three hours. Larger detached homes, properties with major outbuildings, or buildings where signs of significant defect are already apparent can take longer. Our surveyor will need access to all parts of the property that can be reached, including loft hatches where accessible. We then aim to issue the written report within three working days of the inspection.
As part of the inspection, we carry out a visual check for internal signs of flood damage, including tide marks, salt deposits and damp penetration that is consistent with flooding. Some CM20 properties close to the River Stort fall within the Environment Agency's flood zone mapping and carry a higher flood risk designation. Our survey records the condition of the building, but it is not a formal flood risk assessment. Buyers looking near the Stort should separately review the Environment Agency's flood maps, ask their solicitor to obtain flood history from the seller, and confirm buildings insurance cost and availability early in the transaction.
Yes, much of CM20 is underlain by London Clay, and that brings a moderate to high shrink-swell risk. We specifically inspect for signs of foundation movement such as diagonal cracking to walls, sticking doors and windows, and uneven floors, then consider whether any cracking is more consistent with ground movement than simple cosmetic settlement. If we see indicators of possible subsidence, we say so plainly and recommend a structural engineer's assessment before exchange. Properties close to mature trees can face added risk, and we note where nearby trees may be drying out the soil around foundations.
CM20 has an older housing stock, with over 60 to 70% of properties more than 50 years old, so age-related defects appear regularly. Damp is among the issues we identify most often, whether as rising damp in older homes with failed damp-proof courses, penetrating damp through defective pointing or flashings, or condensation in poorly ventilated areas. Roof defects are also common, including older tile and slate coverings and failing lead flashings. We also find timber problems such as rot and woodworm in older floor and roof timbers, outdated electrics where original pre-1960s wiring remains in place, and cracks associated with London Clay movement where foundation risk seems to be present.
Yes. Buyers regularly use our report as the basis for renegotiation with sellers. If we identify condition rating 2 or 3 defects, meaning repairs are needed or serious defects are present, buyers often ask for a reduction that reflects the expected repair cost. In CM20, where sale prices range from £290,000 to £600,000 depending on type, repair liabilities of £5,000 to £30,000 are far from unusual. A request supported by a RICS surveyor's report carries much more weight than an informal conversation, and sellers often prefer to adjust the price rather than lose the sale and return to the market. Our report gives you the evidence needed to make that case properly.
Our full range of property surveys covering Bishop's Stortford and the wider CM20 postcode
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A detailed building survey for listed buildings, pre-1900 properties and complex homes in Bishop's Stortford's conservation areas
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Energy Performance Certificate for CM20 properties, legally required for sales and lettings, and especially relevant given the area's older housing stock
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Identify defects on new build homes in CM20 before legal completion while the developer remains responsible
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EICR inspection for CM20 properties, particularly important in older Bishop's Stortford homes with original pre-1960s wiring
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CP12 gas safety certificate for CM20 landlords and sellers, covering gas installations and appliances
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RICS-qualified chartered surveyors covering Bishop's Stortford and the CM20 postcode area
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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.