You've found your perfect new build home in South London. The show apartment looked immaculate, the developer handed you a glossy brochure, and your mortgage lender's valuation sailed through. So do you really need a survey? The answer — from an independent building surveyor — is an emphatic yes.
At Balham Surveyors, we carry out snagging surveys and new build inspections across Balham, Tooting, Wandsworth, Clapham and the wider South London area. In this guide, we'll explain exactly what a new build survey involves, what it typically uncovers, and why relying solely on the developer's warranty is rarely enough.
Why People Assume New Builds Don't Need Surveys
It's a very understandable assumption. A brand-new home feels safe. It hasn't had previous owners, it hasn't been modified or extended, and it comes with a 10-year structural warranty — usually from the National House Building Council (NHBC) or a similar warranty provider. Surely that's enough protection?
Unfortunately not. The NHBC Buildmark warranty is valuable, but it has significant limitations. During the first two years (the "developer's liability period"), you must go back to the developer to fix defects — and getting developers to respond promptly is notoriously difficult. From years three to ten, the warranty only covers major structural defects, not the dozens of smaller issues that could affect your enjoyment and the value of the property.
A professional snagging survey gives you independent, impartial documentation of every defect before you complete your purchase — putting you in a far stronger legal position to demand remediation.
What Is a New Build Snagging Survey?
A snagging survey is a detailed inspection of a newly constructed property, carried out by an independent surveyor before legal completion. The word "snagging" refers to identifying items that haven't been finished correctly — from cosmetic blemishes like paint runs and cracked tiles through to more serious issues like poorly fitted windows, missing insulation, or drainage problems.
A thorough new build survey by one of our RICS surveyors will inspect:
- External walls and render — checking for cracks, gaps, poorly pointed brickwork and inadequate weathering details
- Roof and guttering — confirming tiles are correctly laid, ridge tiles are bedded, and gutters are properly aligned
- Windows and doors — testing operation, checking seals and confirming compliance with Building Regulations
- Internal walls, ceilings and floors — looking for uneven surfaces, gaps between skirting boards, and poor plastering
- Kitchen and bathroom fitments — checking worktop joints, cabinet alignment, grouting and sanitary ware installation
- Electrical installation — a visual inspection of consumer units, socket heights and light fittings (a full EICR is separate)
- Heating and hot water systems — confirming radiators heat up, thermostats respond and controls work correctly
- Loft and insulation — checking insulation levels and confirming no cold bridges or air gaps
- External areas — driveways, paths, garden fencing and any shared spaces
How Many Defects Do New Builds Typically Have?
The figures may surprise you. According to research by the HomeOwners Alliance, 93% of new build buyers report problems with their home — with an average of 157 defects per property. A 2020 survey by the New Homes Quality Board found that 25% of new homeowners reported a "major problem" within the first two years of ownership.
In our own experience carrying out snagging surveys across South London, we routinely find between 40 and 120 individual snags per property. The most commonly missed defects we encounter include:
- Missing or incorrectly installed cavity wall insulation
- Cracked or uneven render on external elevations
- Poorly sealed window and door frames leading to draughts
- Inadequate floor screed causing bounce or unevenness
- Drainage fall issues leading to standing water
- Missing fire stopping in loft spaces between properties (particularly serious in terraces and semis)
- Incomplete or incorrectly installed mechanical ventilation systems
- Tiles not set to consistent grout lines or correctly bedded
When Should the Survey Take Place?
Timing is crucial. Ideally, your snagging survey should take place after the property has been finished but before legal completion. This means all the work is done, so the surveyor can inspect the finished product, but you haven't yet handed over your money, so you retain maximum leverage to insist on repairs.
Some developers will resist access before completion, claiming the site is not safe or that the property isn't ready. Don't accept this. You have the right to have an independent professional inspect the property before you commit to buying it. If a developer point-blank refuses access, this is a red flag in itself and worth discussing with your solicitor.
If access before completion isn't possible, the survey can still be carried out within the first two years of ownership during the developer's liability period — though you lose some negotiating leverage once you've completed.
Is a Snagging Survey Different from a RICS Building Survey?
Yes, though there is overlap. A RICS Level 3 Building Survey is designed for older properties and focuses on defects arising from age, wear, previous alterations and construction quality. It follows a RICS-standardised format.
A snagging survey is tailored specifically to new build properties and focuses on incomplete workmanship, non-compliance with specifications, and items the developer needs to rectify before handover. It's typically a longer, more itemised report — often with photographic evidence of each individual defect.
For new build flats and houses, we recommend a specialist snagging survey rather than a standard RICS Level 2 or Level 3 survey, as the format and focus are better suited to the task.
What About the Developer's Own Inspection?
Reputable developers carry out their own quality control inspections and "pre-completion" walkthroughs with buyers. This is a positive step, but it has an obvious limitation: the developer's inspector works for the developer, not for you.
In our experience, developer-led snagging tends to catch the most visible cosmetic issues but misses a significant proportion of the technical and structural defects that a trained independent surveyor will find. An independent survey is always preferable.
The NHBC Warranty — What It Covers and What It Doesn't
The NHBC Buildmark policy is the most widely used new build warranty in the UK, covering around 80% of new homes. Here's a simplified breakdown of what it covers:
- Years 1–2 (Builder Warranty): The developer is responsible for fixing defects reported during this period. The NHBC provides a dispute resolution service if the developer won't cooperate.
- Years 3–10 (NHBC Insurance): NHBC insurance covers major structural defects only — issues that affect the structural stability of the building, or cause it to become uninhabitable.
The warranty does not cover: general wear and tear, condensation (unless caused by a structural defect), damage caused by you or your tenants, or issues that fall below their definition of "significant damage."
A snagging survey report gives you a comprehensive record of defects at the point of purchase, making it much easier to pursue claims under the warranty if issues develop later.
How Much Does a New Build Snagging Survey Cost?
The cost of a snagging survey varies depending on the size of the property. As a rough guide:
- One-bedroom flat: from £300–£400
- Two-bedroom flat or small house: from £400–£550
- Three-bedroom house: from £500–£650
- Four or five-bedroom house: from £600–£800+
When you consider that even a small number of the defects uncovered could cost thousands of pounds to fix, the fee for an independent survey represents excellent value. Developers are far more likely to carry out remedial works before completion than after you've moved in.
What Happens After the Survey?
Once our surveyor has completed the inspection, we'll provide a detailed written report — usually within 48–72 hours — itemising every defect found, with photographs and a recommended course of action for each item. You can then share this report with your developer and request that all items are rectified before completion.
We recommend following up in writing and keeping records of all correspondence. If the developer disputes any items or fails to act, your solicitor can intervene, and you may be able to negotiate a retention on part of the purchase price until works are completed.
Do You Need a Survey Even if You're Buying Off-Plan?
If you're purchasing a property that hasn't yet been built — or is under construction — you can't carry out a snagging survey until the build is complete. However, there are still things an independent surveyor can help with at this stage:
- Reviewing the developer's specification documents to check for gaps or ambiguities
- Advising on typical quality standards for new build properties in the area
- Helping you understand what to look for during your pre-completion walkthrough
- Carrying out the snagging survey once construction is complete
New Builds in South London — What to Watch For
South London has seen significant new build development in recent years, from large-scale regeneration schemes in Battersea and Elephant & Castle to smaller infill developments across Balham, Tooting and Wandsworth. Many of these are high-density apartment developments, where shared services, fire compartmentation and sound insulation are particularly important issues.
For new build flats in South London, we pay particular attention to:
- Fire stopping and compartmentation — especially in converted buildings or those above commercial premises
- Sound insulation between floors and party walls — a common complaint in apartment developments
- Communal areas and shared services — lifts, bin stores, bike storage and building entrance systems
- Balcony waterproofing and drainage — poorly detailed balconies are a leading cause of water ingress claims
- Service charges and estate management — worth understanding before you commit, though this falls outside the survey itself
Frequently Asked Questions
You can certainly walk through the property and make notes, and we'd encourage you to do so. But a professional surveyor brings trained eyes, specialist equipment (like damp meters and thermal cameras), and an understanding of Building Regulations and construction standards that most buyers simply don't have. A professional snagging report also carries far more weight when presented to a developer or used in a legal dispute.
Most reputable developers will address the majority of items — particularly during the pre-completion period when you hold the most leverage. Some items may be disputed, and a small number of minor cosmetic issues may not be attended to. Having an independent professional report significantly strengthens your position.
No. A mortgage valuation is carried out for the lender, not for you. Its sole purpose is to confirm that the property provides adequate security for the loan. It does not constitute a detailed survey of the property's condition. Never confuse a valuation with a survey.
A typical two or three-bedroom house takes around 3–5 hours to inspect thoroughly. Larger homes or apartment developments with multiple units may take longer. We'll give you a realistic time estimate when you book.
Absolutely — and we'd encourage it. Being present during the survey gives you the opportunity to ask questions and understand the issues first-hand. You'll also find the written report easier to interpret if you've seen the items during the inspection.
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