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, also called a HomeBuyer Report, is a detailed visual inspection of a property carried out by a RICS-qualified chartered surveyor. Our surveyors examine all accessible areas of the building without lifting floorboards, opening up walls, or testing services directly. Every visible and accessible element of the property is assessed, from the roof to the foundations.
We inspect the roof structure and covering from ground level, chimneys, gutters and rainwater drainage, external walls, windows, and doors. Inside, we check ceilings, walls, floors, kitchens, and bathrooms. A moisture meter is used to identify elevated damp readings throughout the property. Each element receives a condition rating on the traffic-light system, with written commentary explaining the finding and what action you should take.
Given that over 60 to 70% of CM20 properties are estimated to be more than 50 years old, the Level 2 Survey is highly relevant across the majority of the housing stock in the area. Properties built in the inter-war and post-war periods across Bishop's Stortford present age-related defects that our surveyors systematically check for on every inspection.
Our report includes a legal issues section where we flag anything requiring further investigation by your solicitor. This covers extensions or outbuildings without apparent planning permission, alterations to listed buildings, and boundary features needing clarification. Urgent items requiring specialist investigation before exchange of contracts are clearly identified in a separate summary section.
A Level 2 Survey is appropriate for properties built after 1900 using conventional construction and in broadly reasonable condition. For CM20 properties that are pre-1900, listed, significantly altered, or in poor condition, a RICS Level 3 Building Survey provides a more detailed investigation. If you are unsure which level is right for a specific Bishop's Stortford property, contact our team before booking.
The River Stort and its tributaries run through CM20, creating fluvial flood risk zones along their corridors in and around Bishop's Stortford. Surface water flooding is also a recognised risk across parts of the area. Our surveyors note any visible signs of flood-related damage during the inspection, including tide marks, salt deposits on internal plaster, and damp penetration patterns consistent with flooding rather than normal rising or penetrating damp.
Buyers of properties near the River Stort should check the Environment Agency's flood risk maps as a standard step in the purchase process. Your solicitor should request flood history information from the seller and confirm insurance availability as part of their enquiries. Some mortgage lenders apply additional criteria for properties in higher flood zones, and buildings insurance premiums can be elevated for flood-affected properties.
Our survey identifies visible signs of flood damage inside the property, but the formal flood risk assessment for a CM20 property is a separate specialist process. We recommend buyers treat the flood risk check as a parallel step alongside the survey, not an alternative to it. Our report gives you documented evidence of the property's physical condition, while flood risk maps and specialist flood reports address the environmental risk context.
Surface water flooding is a separate risk from river flooding and can affect properties at any point in CM20, not just those near the Stort corridor. Areas with impermeable surfaces, poor drainage infrastructure, or low points in the local topography can be affected. Our surveyors assess the drainage arrangements visible at the property and note any features that could contribute to surface water accumulation.

Source: Market data as of February 2026. Figures are approximate ranges for the CM20 postcode area.
The geology of CM20 is characterised by London Clay and superficial deposits of River Terrace materials and alluvium along river valleys. London Clay is a high-plasticity clay soil that shrinks during dry periods and expands when conditions become wet again. This shrink-swell behaviour is rated as a moderate to high risk for the area and can cause ground movement beneath building foundations.
Properties with shallow foundations or those built over areas where clay is close to the surface are more susceptible to foundation movement. This risk is higher during and after prolonged dry spells, when the ground shrinks and foundations can lose lateral support. During wet periods that follow dry spells, the clay expands, and where settlement is uneven, structural cracking can result.
Our surveyors examine external walls for diagonal cracking at corners, around door and window frames, and at junctions between different structural elements. Internally, we check for cracking patterns in walls and ceilings, and for unevenness in floors. Where cracking patterns are consistent with foundation movement rather than normal settlement or thermal movement, we flag this clearly and recommend a structural engineer's assessment.
Mature trees near CM20 properties add to the subsidence risk. Tree roots extract moisture from clay soil, causing localised shrinkage under foundations. Our surveyors note the proximity of mature trees - particularly willows, poplars, and oaks - to the building and flag this where it presents a risk. Even trees that have been removed can leave legacy desiccation effects in the soil for several years, a risk we also note where relevant.
Properties that have experienced subsidence in the past and been underpinned or monitored represent a different risk profile to untreated cases. Our survey identifies evidence of historic movement and remediation, which can affect insurance premiums and mortgage availability. This information is documented in the report so buyers can make an informed decision about how to proceed.
Bishop's Stortford town centre includes conservation areas and a significant number of listed buildings, particularly along historic streets and in the older parts of the town. The Town Centre Conservation Area aims to protect the historic character of the area. Buyers of properties within conservation areas or with listed building status need to understand the specific restrictions and obligations this creates.
Listed buildings in CM20 cannot be altered without listed building consent from East Herts District Council. This includes extensions, window replacements, changes to internal historic features, and some maintenance works. Our survey report notes where alterations appear to have been carried out on a listed property and identifies where consent documentation should be sought from the seller. Unauthorised works to a listed building are a criminal offence and remain with the property regardless of who carried them out.
Older properties in CM20 are predominantly constructed with traditional red or yellow stock brick, timber roof structures with clay or concrete tiles, and solid wall construction for pre-1930s buildings. Cavity wall construction became standard from the 1930s onwards. These traditional construction types require specific approaches to maintenance and repair - lime mortar pointing, appropriate breathable coatings, and compatible repair materials.
Where previous owners have applied incompatible repair materials to older properties - cement pointing over lime mortar, impermeable renders over solid brick walls, or modern sealants over traditional construction - our surveyors identify these issues and note the implications. Incompatible repairs can trap moisture in the structure and cause progressive deterioration that, over time, becomes more costly to resolve.

Bishop's Stortford's excellent rail connections to London Liverpool Street and Cambridge, combined with Stansted Airport nearby, have sustained strong housing demand in CM20 over many years. This demand means that properties can move quickly and buyers face competitive conditions. Getting your survey booked promptly after having an offer accepted - rather than waiting until later in the conveyancing process - means you have more time to act on findings, negotiate if necessary, and seek specialist reports where required before the exchange deadline.
For a typical three-bedroom semi-detached property in CM20, RICS Level 2 Survey fees generally range from £450 to £700. Nationally, Level 2 Surveys typically cost between £400 and £900, depending on property value, size, and complexity. Fees in CM20 sit within the mid-to-upper range of the national scale, reflecting the area's above-average property values and the characteristics of the housing stock.
Property type affects the cost. Flats and smaller properties are generally at the lower end of the range, typically £400 to £550. Terraced houses run from around £450 to £600, semi-detached from £450 to £700, and detached homes from £550 to £800 or above, depending on size and complexity. Properties with multiple extensions, unusual construction features, or significant outbuildings may require more inspection time and incur higher fees.
For CM20 properties that are listed buildings or pre-1900, a RICS Level 3 Building Survey is often more appropriate than a Level 2. Level 3 surveys are priced higher due to the more detailed inspection and reporting they require, but they provide the depth of assessment needed for older or more complex buildings. If you are not sure which level is right for your property, our team can advise before you book.
Against the cost of purchasing in CM20 - where properties range from around £190,000 for a flat to £600,000 or above for a detached home - the survey fee represents a small and worthwhile investment. A survey that identifies a significant defect can support a renegotiation worth many multiples of the survey cost, while a satisfactory survey report gives buyers confidence to proceed and documents 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.
Complete our online quote form with the property's address, type, and approximate value. We confirm our fee and check surveyor availability in CM20, usually within a few hours on working days.
Once you accept our quote, we arrange a convenient inspection date. We aim to inspect within five to ten working days of booking, depending on surveyor availability in Bishop's Stortford and the wider CM20 area.
Our RICS-qualified chartered surveyor visits the property and carries out a thorough visual inspection of all accessible areas. For a standard CM20 terraced or semi-detached home the inspection typically takes two to three hours.
We deliver your completed report in PDF format within three working days of the inspection. The report covers all inspected elements with condition ratings, written commentary, and a clear summary of risks and urgent items.
Our team is available to talk you through the report findings. If issues are identified, we explain their significance, urgency, and what your next steps should be - including whether specialist reports are needed before exchange.
With over 60 to 70% of CM20 properties estimated to be more than 50 years old, age-related defects are common across the housing stock. Damp in its various forms is among the most frequently identified issues - rising damp where the damp-proof course has failed or is absent, penetrating damp through defective pointing or flashings, and condensation in poorly ventilated bathrooms, kitchens, and loft spaces.
Roof condition is another regular concern. Properties built in the inter-war and post-war periods may have original tile or slate coverings that are approaching or past their expected service life. Slipped, cracked, or missing tiles, failing lead flashings around chimneys, and blocked or damaged valley gutters are defects our surveyors regularly identify. Timber roof structures in older properties can also show signs of woodworm or rot, particularly where ventilation is inadequate.
Outdated electrical installations are found in properties where original wiring has not been updated. Pre-1960s wiring systems, rubber-insulated cables, and consumer units without residual current devices are identified where visible, and we recommend a full Electrical Installation Condition Report by a qualified electrician where concerns exist. Older plumbing systems, including lead pipes in pre-1970s properties, are also noted.

When our report identifies condition rating 3 defects - serious or urgent items - we recommend seeking specialist assessments before proceeding to exchange. For structural cracking consistent with subsidence, a structural engineer's report is appropriate. For concerns about the roof structure, a specialist roofing contractor's assessment is recommended. Where our survey flags potential flood damage or damp, a specialist damp and timber surveyor can provide a detailed diagnosis.
Mortgage lenders frequently require specialist reports where a survey has flagged concerns. Lenders can apply a retention to the mortgage offer, holding back part of the loan until repairs are completed or specialist investigations are reviewed and found satisfactory. Being aware of this before exchange allows buyers to plan for any delays and avoid pressure at completion.
Condition rating 2 findings - repairs needed but not urgent - support price negotiation with the seller. In CM20, where properties can sell for £350,000 to £600,000 or above depending on type, a repair programme worth £5,000 to £20,000 is a meaningful negotiation. Our report provides the documented evidence to support a price reduction request, and sellers regularly agree to adjustments rather than lose the sale and restart the marketing process.
For CM20 buyers of listed buildings where unauthorised alterations are identified, our report provides the basis for formal enquiries to East Herts District Council and to the seller. Clarifying the planning and consent position before exchange avoids taking on legal liability for works carried out by a previous owner.
Our team remains available after delivery of your report to answer questions and help you work through any findings. If specialist contractors or engineers are needed in the CM20 area for follow-up investigation, we can advise on the types of specialists required, even if we do not make personal referrals to specific firms.
For a typical three-bedroom semi-detached property in CM20, RICS Level 2 Survey fees generally range from £450 to £700. Flats are usually at the lower end of the range, around £400 to £550, while larger detached homes can run from £550 to £800 or above depending on size and complexity. The exact fee depends on the property's type, size, and value - use our online quote form to get a confirmed price for your specific CM20 property before committing. National averages place the typical Level 2 Survey cost at £400 to £900 across all regions.
Our surveyors cover the full CM20 postcode area, including Bishop's Stortford town centre, the surrounding residential areas, and the rural parts of the postcode. We inspect the range of property types found across CM20, from Victorian and Edwardian terraces in the older parts of Bishop's Stortford to inter-war semi-detached homes, post-war estates, and more modern residential developments. We also cover properties near the River Stort corridor where flood risk awareness is particularly relevant.
For a standard CM20 semi-detached or terraced home the inspection typically takes two to three hours. Larger detached properties, those with significant outbuildings, or properties showing signs of major defect may take longer. Our surveyor needs access to all parts of the property during the inspection, including loft hatches where accessible. We aim to deliver the completed written report within three working days of the inspection.
Our survey inspection includes a visual check for signs of flood damage visible inside the property - tide marks, salt deposits, damp penetration consistent with flooding. Properties near the River Stort in CM20 sit within the Environment Agency's flood zone mapping, and some carry a higher flood risk designation. Our survey documents the property's physical condition but is not a formal flood risk assessment. We recommend buyers of properties near the Stort check the Environment Agency's flood maps separately and ask their solicitor to obtain flood history from the seller. Buildings insurance availability and cost should also be confirmed early in the process for flood-zone properties.
Yes, London Clay underlies much of CM20 and creates a moderate to high shrink-swell risk. Our surveyors specifically look for signs of foundation movement - diagonal wall cracking, sticking doors and windows, uneven floors - and assess whether any cracking present is consistent with ground movement rather than cosmetic settlement. Where we identify indicators of potential subsidence, we note this clearly and recommend a structural engineer's assessment before exchange. Properties near mature trees face additional ground risk, and our surveyors note where trees close to foundations could be contributing to soil desiccation.
With over 60 to 70% of CM20 properties more than 50 years old, age-related defects are common. Damp is among the most frequently identified issues, presenting as rising damp in older properties with failed damp-proof courses, penetrating damp through defective pointing or flashings, and condensation in poorly ventilated spaces. Roof condition is regularly flagged, with older tile and slate coverings and failing lead flashings commonly noted. Timber defects including woodworm and rot appear in older floor and roof timbers. Outdated electrics are found in properties with original pre-1960s wiring that has not been updated. Cracks consistent with London Clay ground movement are identified where foundation risk appears present.
Yes, and our report is regularly used by buyers as the basis for renegotiating with sellers. When our survey identifies condition rating 2 or 3 defects - repairs needed or serious defects - buyers request a price reduction equivalent to the estimated repair cost. In CM20, where properties sell at prices between £290,000 and £600,000 depending on type, repair items worth £5,000 to £30,000 are not uncommon. A request backed by a RICS surveyor's report carries significantly more weight than an informal request, and sellers generally prefer adjusting the price to losing the sale and going back to market. Our report gives you the documented evidence to make that request effectively.
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 important 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 - covers 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.