7 Common New Build Defects to Look For

Table of Contents

• What Are New Build Defects and Why They Matter

• 1. Damp and Moisture Issues

• 2. Cracks in Plaster and Brickwork

• 3. Poor Drainage and Water Ingress

• 4. Defective Windows and Doors

• 5. Electrical and Plumbing Faults

• 6. Gaps, Misalignment and Poor Finishing

• 7. Structural Movement and Settlement

• Using a New-Build Snagging Checklist Before Handover

• Frequently Asked Questions

Last Updated: October 11, 2026

What Are New Build Defects and Why They Matter

New build defects are structural or finishing problems that appear in recently constructed properties. These range from minor cosmetic issues to serious structural faults that affect safety and value.

When you purchase a new build property, you expect it to be in perfect condition. Reality often differs. Builders work under tight schedules and budget constraints, which can lead to oversights.

The key is knowing which new build defects demand immediate attention and which can wait. This guide covers the seven most common issues identified during new-build snagging inspections. Each defect carries different risks and repair timelines.

RICS Home Survey standards define what professional surveyors look for during inspections. A thorough new-build snagging inspection identifies defects while you still have warranty cover and builder liability.

1. Damp and Moisture Issues

Damp is one of the most serious new build defects because it worsens over time and causes structural damage. Moisture trapped in walls, basements, or around windows creates ideal conditions for mould growth and timber rot.

New buildings are particularly vulnerable during their first year. Fresh plaster, concrete, and render contain significant moisture that must evaporate. Poor ventilation or blocked air bricks trap this moisture inside, leading to condensation and surface damp on walls and ceilings.

Look for these warning signs:

• Discolouration or staining on plaster, especially near corners or skirting boards

• Soft or crumbly plaster that feels damp to touch

• Musty smells in rooms, particularly bedrooms and bathrooms

• Mould spots, particularly black mould, on ceilings or in corners

• Peeling wallpaper or paint bubbling away from walls

The most common cause is inadequate damp-proof course installation or bridging, where materials allow moisture to bypass the protective layer. Poor site drainage or missing air bricks also contribute significantly.

Get a moisture meter reading if you suspect damp. New-build snagging inspections can include moisture testing to establish whether the property has genuine damp or simply normal drying-out moisture from new construction.

2. Cracks in Plaster and Brickwork

Fine cracks in plaster are common in new builds and usually harmless. Structural cracks in brickwork are not. The distinction matters enormously for your property's long-term safety and value.

New plaster shrinks as it dries, creating hairline cracks that follow the joint lines between plasterboard sheets. These typically appear within the first six months and stabilise naturally. They're cosmetic, paint covers them easily.

Structural cracks are different. They run diagonally across brickwork, appear on both interior and exterior walls, or widen noticeably over weeks.

Distinguish between them:

• Hairline cracks: Follow straight lines, appear only in plaster, less than 2mm wide, stable over time

• Structural cracks: Run diagonally, appear in brickwork itself, wider than 3mm, grow visibly over weeks

• Step cracks: Follow mortar joints in a stair-step pattern, always structural

Photograph any cracks you find and monitor them over two weeks. If they're unchanged, they're almost certainly harmless plaster shrinkage. If they widen, contact the builder immediately and request a structural engineer's assessment.

3. Poor Drainage and Water Ingress

Water ingress is a new build defect that manifests as dampness, staining, or actual water penetration during heavy rain. It occurs when drainage systems fail, gutters are blocked, or external sealing is incomplete.

New builds often have drainage systems that haven't been fully tested. Gutters may be installed but not properly aligned. Downpipes might be disconnected or blocked with construction debris.

Check these areas carefully:

• Gutters and downpipes for blockages, misalignment, or gaps

• External walls for cracks or gaps where water could enter

• Window and door frames for proper sealing and weeping holes

• Ground level near the building, does water drain away or pool?

• Basement or ground floor rooms for water stains, especially after rain

Water ingress often appears first in basements or ground floor rooms during the first heavy rainfall. Damp patches on interior walls directly beneath gutters signal gutter overflow or leakage.

Poor drainage is particularly serious in areas prone to heavy rainfall or flooding. A new-build snagging inspection should include drainage verification and photographic evidence of water flow paths around the property.

4. Defective Windows and Doors

Windows and doors are common new build defects because they're installed early and subject to weather exposure during construction. Issues range from poor sealing to misalignment that prevents proper closure.

Defective windows and doors fail to seal properly, allowing draughts, water ingress, and heat loss. They may not close smoothly, stick in certain weather conditions, or rattle when closed. These problems reduce thermal efficiency and increase heating bills significantly.

Inspect windows and doors thoroughly:

• Open and close each one multiple times, they should move smoothly without binding

• Check seals around the frame for gaps or deterioration

• Look for condensation between double-glazing panes, indicating seal failure

• Test for draughts by holding a candle near the frame, flame should not flicker

• Verify that doors close and lock securely without forcing

• Check that hinges are level and hardware operates smoothly

Many new build defects in windows stem from poor installation rather than manufacturing faults. Frames installed before walls are fully dried can twist slightly, causing misalignment. Insufficient sealant or poor caulking allows water penetration.

5. Electrical and Plumbing Faults

Electrical and plumbing systems in new builds are tested before handover, but defects still slip through. These faults range from minor inconveniences to genuine safety hazards.

Common electrical issues include:

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• Sockets or switches that don't work

• Lights that flicker or fail intermittently

• Incorrect polarity in circuits

• Missing or inadequate earthing

• Insufficient circuits for the property's size

Plumbing defects include:

• Leaks at joints or under sinks

• Poor water pressure or no water to certain outlets

• Radiators that don't heat evenly

• Boiler faults or inadequate commissioning

• Noisy pipes or water hammer

Test every socket, switch, and light before handover. Run water from every tap and check for leaks underneath. Flush toilets and observe water flow. Feel radiators to confirm even heating. These tests take 30 minutes and reveal most common faults.

Electrical faults pose safety risks. If you discover faults, request a qualified electrician's inspection and remedial work. Plumbing leaks cause water damage rapidly. Never accept "we'll fix it after handover", demand completion before you take possession.

6. Gaps, Misalignment and Poor Finishing

Gaps and misalignment represent poor workmanship rather than structural defects, but they're extremely common in new builds. These cosmetic issues affect the property's appearance and can lead to water ingress if left unaddressed.

Look for:

• Gaps between skirting boards and walls or floors

• Misaligned door frames or architrave

• Uneven grout lines in tiling

• Gaps around pipes and cables passing through walls

• Poorly fitted kitchen units or worktops

• Uneven flooring or squeaky boards

These issues often result from rushing installation or inadequate quality control. Builders prioritise completing properties on schedule, sometimes at the expense of finishing quality.

Document every gap and misalignment photographically. Most builders will remedy these issues quickly because they're straightforward to fix. Caulking gaps, adjusting door frames, and re-grouting tiles are standard snagging works.

A new-build snagging checklist should include systematic checking of all finishing details. Walk through every room methodically, checking corners, joints, and transitions between materials. This catches the majority of cosmetic defects.

7. Structural Movement and Settlement

Structural movement and settlement occur as new buildings respond to environmental changes and load-bearing stresses. Most movement is minor and stabilises within the first two years. Some movement indicates serious underlying problems.

New concrete and timber shrink as they dry. Foundations settle slightly under the building's weight. These natural processes create hairline cracks and minor movement that's entirely normal. The concern arises when movement is excessive, continues beyond the first year, or indicates foundation failure.

Warning signs of problematic structural movement include:

• Cracks that widen noticeably over weeks or months

• Doors and windows that become progressively harder to open or close

• Visible gaps appearing between walls and ceilings

• Sloping or uneven floors that worsen over time

• Cracks appearing in multiple locations simultaneously

• Structural cracks (diagonal, step-pattern, or in brickwork itself)

Excessive movement suggests inadequate foundations, poor ground preparation, or subsidence. This requires professional structural assessment and potentially expensive remedial work.

Document all movement with dated photographs taken fortnightly. This establishes whether movement is stabilising (normal) or accelerating (problematic). Building surveyors can assess movement patterns during new-build snagging inspections and recommend further investigation when necessary.

Using a New-Build Snagging Checklist Before Handover

A new-build snagging checklist is your most important tool for identifying defects before handover.

Create a systematic checklist covering every room and every system.

Your checklist should include:

• Damp and moisture testing

• Crack assessment and documentation

• Drainage verification

• Window and door operation

• Electrical and plumbing function

• Finishing quality and alignment

• Structural movement assessment

Time your inspection for late afternoon when natural light is best. Bring a torch, moisture meter, level, and camera.

Submit your snagging list to the builder in writing, ideally with photographs. Most builders respond quickly to snagging lists, these are routine in new construction.

New-build snagging inspections can document defects professionally and create a formal record. This can be used in negotiations and may offer protection if disputes arise later.

New build defects are preventable through thorough inspection before handover. The seven defects covered here represent the most common issues we identify during new-build snagging inspections.

Volarex's Chartered Surveyors have over two decades of experience in construction and building. Our new-build snagging inspections provide detailed documentation of defects, which can be used to secure builder remediation. Contact Volarex today and protect your new property investment with a professional snagging inspection before handover.

Frequently Asked Questions

What are the most common defects in new-build homes?

The most common new build defects include damp and moisture problems, cracks in plaster and brickwork, poor drainage, defective windows and doors, electrical and plumbing faults, gaps and misalignment in finishes, and structural movement. Many of these develop during the initial months as the building settles. Early identification through a professional new-build snagging inspection can prevent costly repairs later and ensure the builder addresses issues under warranty.

What should I check during a new-build snagging inspection?

A comprehensive new-build snagging checklist should include checking for damp patches, cracks in walls and ceilings, water ingress around windows and doors, drainage functionality, electrical socket and switch operation, plumbing leaks, gaps between doors and frames, misaligned fixtures, and signs of settlement. A professional surveyor will also inspect roof condition, guttering, external render, and structural alignment. Document all findings with photographs and specific locations to provide clear evidence when reporting defects to the builder.

How do I report defects to my new-build developer?

Report defects to a house builder in writing, ideally by email, with photographs and a detailed list of issues. Reference the specific rooms, measurements, and dates you discovered each defect. Most builders have a formal snagging period (typically 12 months) during which they're contractually obligated to address defects. Keep copies of all correspondence and follow up in writing if issues aren't resolved. If the builder refuses to act, escalate to the National House Building Council (NHBC) or relevant warranty provider.

What happens if defects remain after the snagging period?

New-build defects after completion become your responsibility if they fall outside the warranty period. However, structural defects and those caused by poor workmanship may be covered by NHBC or LABC Warranty for up to 10 years. Defects that develop within the first year are typically the builder's responsibility. If a builder refuses to fix issues during the warranty period, you can lodge a complaint with the relevant warranty provider or seek legal advice. Professional documentation from a surveyor strengthens your claim significantly.

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