The drain and apron should carry rain away from your walls. How to check them at handover, word the defects and judge the repair.
The perimeter drain and the concrete apron around a new landed house have one job: carry rain away from the walls. The usual defects at handover are drains laid without a steady fall, so water stands in them; cracked or broken drain sections; covers that rock, are missing or do not fit; cement and debris left in the channel; downpipes that do not discharge into the drain; and aprons that slope towards the wall or have an open joint against it. Check them after rain or with a bucket of water at vacant possession, list each one in writing, and send it to the developer inside the 24-month defect liability period.
Walk around a new terrace, semi-D or bungalow and you will usually find a concrete apron along the outside walls and an open or covered drain at its edge, with the roof downpipes feeding into it. When these are built well, rain runs off the roof, down the pipes, into the drain and away to the outlet without wetting the base of the walls. When they are not, you see pools in the drain days after the rain, green slime and mosquito larvae in the low spots, cracked channel sections, a gap opening where the apron meets the wall, and damp marks creeping up the paint.
Settlement of the apron or car porch slab is a related but separate problem with its own causes. The guide to a sinking car porch or apron in a new house covers it in detail; this page concentrates on the drain and the apron as drainage surfaces.
External drains are often among the last works on a project, built by a different team from the house and sometimes after the roof and gutters. If the channel is cast without checking the fall from end to end, water collects in the flat or back-falling sections. Precast sections that are not bedded properly crack or shift as the fill beneath them settles. Covers are ordered to a standard size and may not suit the channel they sit on.
The apron has its own issues. It is a ground-bearing slab laid on filled ground around a house that usually stands on different foundations, so the joint between the two moves. The car porch and apron guide notes that this gap is often filled with sealant by the developer and then opens again, and that a slab not tied to the house needs a flexible joint, not rigid mortar. Finally, clean-up crews sweep cement, sand and offcuts into the nearest drain.
You do not need tools beyond a bucket, a torch and a notebook. The best time is during or just after rain; if the day is dry, pour water yourself.
| Element | What to look for | Simple owner check |
|---|---|---|
| Drain channel | Standing water, slime, debris, cracked or displaced sections | Walk the full length; pour a bucket at the high end and watch whether it reaches the outlet |
| Drain outlet | Outlet blocked, higher than the channel, or not connected to the road drain | Find where the water leaves your lot and check it flows freely |
| Drain covers and gratings | Missing, cracked, rocking or wrong-size covers; sharp edges | Press each cover with your foot and look for gaps at the ends |
| Downpipes | Pipe ending above the apron instead of into the drain | Follow each downpipe to where it discharges |
| Apron surface | Slope towards the wall, low spots, cracks across the slab | Pour water near the wall and see which way it runs |
| Apron-to-wall joint | Open gap, cracked sealant, mortar packed into the joint | Look along the base of every external wall with a torch |
Record each finding with the side of the house and the nearest room, for example "rear apron outside the kitchen". You can tick your defects room by room on ClickBina's checklist tool and add these under the external section.
Falls are the most common perimeter drain defect and the easiest to prove. A drain should empty after the rain stops. Water that sits in the same stretch the next day, a stripe of green slime along the bottom, or silt collecting in one section all point to a channel that is flat or falls the wrong way. Standing water in an outdoor drain also breeds mosquitoes, which makes it more than a cosmetic issue.
Do not try to fix falls by adding cement to the channel yourself before the developer has seen it. Once the drain has been altered, the defect becomes your work. The drain cleaning guide explains how silt and debris also cause overflow, which is a maintenance issue once the drain itself has been built correctly.
The apron should shed water away from the house into the drain. If water runs towards the wall or ponds along it, every storm soaks the base of the wall and the ground under the slab. Over time that can show as damp marks and peeling paint at skirting level inside, and it speeds up settlement under the slab. The rising damp guide explains why water held against a wall base shows up as damp indoors.
Cracks across an apron are common because it is a large slab on fill. Fine surface cracks are usually shrinkage; cracks with one side higher than the other, cracks that keep widening, or a slab that has dropped away from the wall are signs of movement and belong on the defect list. The guide to cracks in a new house helps you sort the two.
Use the table as a guide, not a rule book. It is qualitative because there is no homeowner-measurable published tolerance for drain falls or apron cracks; judge by whether water is carried away from the house.
| Finding | Usually | Why |
|---|---|---|
| Water still standing in the drain the next day | Defect | The channel has no steady fall to the outlet |
| Cracked or displaced drain section | Defect | Water leaks into the ground beside the house |
| Missing, cracked or rocking cover | Defect | Safety risk and debris enters the drain |
| Cement or construction debris in the drain | Defect | Left by the builder; blocks flow |
| Downpipe discharging onto the apron | Defect | Roof water is released against the wall |
| Apron sloping towards the wall | Defect | Water ponds at the base of the wall |
| Gap at the apron-to-wall joint filled with rigid mortar | Defect to list | The joint moves and needs to be flexible |
| Fine hairline surface cracks on the apron | Usually cosmetic | Shrinkage; list it only if it widens or steps |
| Leaves or garden soil in the drain | Normal | Routine cleaning by the owner |
Write each item so the developer's team can find it without you. Location, element, problem, request.
Send the list in writing and keep a copy. The new house defects guide explains how to submit it and follow up.
Ask the developer's team to pour water at the high end of the drain after the repair while you watch. If the drain empties, note the date on your copy of the list.
If the drain ponds again or the joint at the wall reopens, report it again in writing as a repeat defect, giving the date of the earlier repair. The defect liability period guide says an inadequate repair should be documented and reported again, because it is a fresh breach of the developer's obligation. A joint that keeps reopening can also mean the apron is still settling, which is the point to read the porch and apron guide and consider an engineer's view.
If damp marks indoors persist after the outside has been fixed, a water leak detection visit can rule out a buried pipe or a failed waterproofing layer before anyone hacks the floor. The garden drainage guide covers where water from the lot is allowed to go.
For a new house bought from a licensed developer, the defect liability period is 24 months from vacant possession. Drain and apron faults are easiest to see in the wet season, so check again after the first monsoon and send a further written list if needed. The defect liability period guide says the developer is typically expected to make good within 30 days of receiving your written notice.
Hold off on landscaping, planter boxes or a porch extension that covers the apron until the drain and apron defects are fixed. Building over them hides the evidence.
ClickBina offers a defect inspection service in KL & Selangor. We walk the drains and apron as part of the inspection, test the falls with water, write a numbered defect list for the developer, and can carry out rectification for items the developer does not cover or after the period ends. As an experienced KL & Selangor contractor handling whole-house refurbishment and trade coordination, the same team can re-lay drains, apron and porch works as one job.
Where damp points to a hidden leak, leak detection is a separate visit at RM300 – RM800. For repair work, a site visit to quote is RM150, waived if you go ahead. We reply within the hour, the price we agree is a flat price with no hidden charges, and ClickBina is registered with SSM.
Methodology: defect-versus-normal calls are qualitative. We do not quote fall ratios or crack widths as pass marks, because no homeowner-measurable figure is published for these.
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