A House for the Monsoon
Designing for rain, shelter, and everyday life in coastal Maharashtra.
A coastal house imagined around a garden, with rooms opening onto a covered verandah.
All six images in this article are AI-generated concept illustrations of a fictional home. They do not show a completed Team Design Architects project.
You arrive with an umbrella, a bag of groceries and wet shoes, and there's nowhere to put any of it while you look for the key. Rain runs off the canopy beside your shoulder. Before you're through the door, the house has made the afternoon harder than it needed to be.
On the Konkan coast, rain is the main condition a house is designed for. The Ghat and coastal districts of Maharashtra receive around 2,000 mm of rain a year. [1] In Ratnagiri, a study of 30 years of monsoon records (1980 to 2009) found no significant change in total rainfall, but more very heavy to exceptionally heavy rainfall events. [2] That is one district and one study, so treat it as a signal and not a forecast. Still, it points at the right question: can the house cope with the worst afternoon, not the average one?
This guide is for people planning to build on the coast. It follows the water: where it arrives, where it goes, and what you have to look after. Each section ends with questions to put to your architect. Conditions vary across Maharashtra, and a solution that suits a sheltered coastal plot may need rethinking on an exposed hillside or farther inland.
Start with the plot
Before anyone draws a floor plan, find out how rain moves across the land. Where does it collect? Does water arrive from higher ground? Where can it leave the site? The answers decide where the house, its paths and its garden can sit.
The basic principle is to slope the ground away from the building so surface water moves away from walls and foundations, then give that runoff somewhere to go. [5] Where a roof drains to the eaves without gutters, rain bounces off the ground and splashes the base of the wall, so that part of the wall needs protection. [5] The CPWD maintenance manual lists plinth protection and drains among the things to check before every monsoon. [8]
A planted garden is part of the answer, but greenery alone says little about drainage. Flood risk is a separate question and needs its own assessment. A house that sheds rain well is not automatically safe from flooding.
Ask your architect
- Where does water collect on the plot, and where does it leave?
- Which way do the paths and the ground around the house slope?
- How is the base of each wall protected from splash?
- Has flood risk been assessed separately from drainage?
Give the rain a route
A tiled roof gives the illustrated house much of its character, and its broad edge does real work. Building Science Corporation's review of rain control puts the benefit of overhangs and peaked roofs at roughly half: they reduce the rain that lands on walls by about 50%. A single-storey house on a sheltered site with wide overhangs does better still. [3] Wind and exposure still decide how much gets through, so the same overhang protects an exposed site less.
The water then needs a route. Gutters, outlets and downpipes have to work as one connected path, and every pipe should be reachable for inspection. [5] Flashing at junctions has to be continuous and slope outward. [3] Where a parapet wraps a flat roof, water can't run off the edge, so the EPA guidance asks for a second route, such as scuppers through the parapet, in case the main drain blocks. [5]
None of this means you must have a pitched roof. A carefully detailed low-slope roof is another option, and either one needs a drainage strategy that suits its shape. Settle the roof early enough that its pipes and outlets belong in the design, instead of turning up wherever space happens to be left.
Ask your architect
- Where does each roof drain, and is there a second route if the first one blocks?
- Where are the downpipes, and can they be reached for inspection?
- How are junctions and roof penetrations flashed?
- How far does the roof project past each wall, and which sides take the most driving rain?
Room to arrive
EPA guidance on entrances asks for enough overhang to keep rain from blowing in, and to stop large amounts of water collecting in front of the door where it gets tracked inside. [4] In practice that means setting the door back from the exposed edge and planning the approach, the landing and the threshold together. A canopy can't make up for paving that sends runoff straight to the doorway.
Then come the small daily things. There should be room to close an umbrella, put a bag down and sit to take off wet shoes without blocking the door. A bench and a clear place to leave an umbrella will do more for an entrance than another decorative feature.
Ask your architect
- Is the door set back from the exposed edge?
- Which way does the paving slope at the threshold?
- Is there somewhere to sit, and somewhere to leave an umbrella and wet shoes?
A verandah worth staying in
A verandah earns its place when you can actually sit in it. Two chairs need room around them. Someone should be able to walk past without moving the table, and a reading seat has to sit inside the covered edge, not on it. To test a design, imagine a shower: where does the tea go, and can you see the garden from the chair?
A deep roof helps, but overhangs reduce wind-driven rain and don't stop it. [3] A change in wind can still carry rain under the edge, so plan furniture that can move and openings that can close.
On the coast, that flexibility is much of the appeal. Lunch can linger at the edge of the garden, and a passing shower doesn't have to send everyone into the living room. The verandah becomes somewhere the family actually spends time.
Ask your architect
- How deep is the verandah, and does it hold two chairs plus a clear walkway?
- When the wind changes, which sides can be closed?
- Can you see the garden from a seated position?
Let the house adjust
A room that feels breezy and a room that stays dry are different things. Moving air makes a room more comfortable, but warm, humid air from outside doesn't take moisture out of the house. The EPA's guidance is blunt about it: increase ventilation when the outside air is cold and dry, and dehumidify when it is warm and humid. [6] During the monsoon, the air on this coast is the second kind.
So the house should offer choices. A sheltered window might stay open in a light shower, while an exposed one has to close. In heavier weather the house should still be pleasant to be in with its doors shut, and that may mean planning for dehumidification as well as openings. The open-door view in the illustration is one way of using the room, not its only setting.
Keeping rain out also has to leave room for daylight and ventilation. India's energy code for homes, the Bureau of Energy Efficiency's Eco Niwas Samhita, treats both as part of the building envelope. [7] When you plan a deep verandah, ask what happens to the room behind it. Ask while window positions and room depths can still change.
Ask your architect
- Which windows can stay open in light rain, and which have to close?
- How will the house cope with humidity when everything is shut?
- Do the rooms behind the verandah still get daylight on an overcast afternoon?
Think beyond the first monsoon
Picture the house several monsoons from now. A gutter needs clearing, a seal has failed, and someone has found a stain and wants to know where the water came in. Can those jobs be done without taking apart a carefully finished corner?
Access is easy to overlook in a new building. It matters once the house is lived in. The CPWD maintenance manual, written for public buildings but a useful reference for any owner, says to check roofs, rainwater pipe inlets, the khurra, the top of the chajja, outlet pipes, plinth protection and drains at least twice a year, and especially before the monsoon. It also says repairs for leakage and dampness should be finished before the monsoon begins. [8] A small stain noticed in April gives you time to trace it before the first long spell of rain.
Materials need the same conversation. Ask how a surface will be cleaned, how a damaged piece can be replaced and what upkeep the owner will arrange. A finish chosen from a dry sample board leaves too much unanswered.
Before each monsoon
- Clear the roof, the khurra, the rainwater pipe inlets and outlets, the top of the chajja and the drains.
- Check the gola and the top of the parapet for cracks.
- Look at the waterproofing around anything fixed to the roof, such as solar panels or a dish antenna, and for weeds growing on it.
- Check terrace tanks for leaks.
- Trace any stain or damp patch while the weather is still dry.
The payoff is ordinary. You get home, leave the umbrella by the door and settle into a chair under cover. The garden is close enough to watch while the rain passes. There's somewhere comfortable to wait, and no reason to hurry indoors.
For a built example of coastal design in Alibaug, see how we approached the Glass Kitchen. To see how a project moves from brief to handover, read about our process, or browse the bungalows we have designed in Alibaug and Lonavala. Inside the house, see the homes and interiors we have designed in Mumbai. If you are budgeting, what an architect costs is set out on our fees page.
Terms used in this guide
- Chajja: a projecting sunshade or rain shelter over a window or door.
- Downpipe: the vertical pipe that carries water from a gutter to the ground or a drain.
- Eaves: the lower edge of a roof, where it overhangs the wall.
- Flashing: thin waterproof material that seals the joint where a roof meets a wall or is pierced by a pipe.
- Gola: the curved fillet where a flat roof meets its parapet wall.
- Khurra: the outlet at roof level where rainwater enters a downpipe.
- Parapet: a low wall around the edge of a roof or terrace.
- Plinth: the raised base on which a building's walls stand.
- Scupper: an opening through a parapet that lets water drain off a roof.
Sources
[1] TERI. Maharashtra climate context, EVA project case study.
[3] Building Science Corporation. John Straube, Rain Control in Buildings (BSD-013).
[6] US EPA. Mold Remediation in Schools and Commercial Buildings, Chapter 2 (ventilation and humidity).
[7] Bureau of Energy Efficiency. Eco Niwas Samhita, residential building envelope.
[8] CPWD. Maintenance Manual 2019, section 2.1 (page 6) and section 7.2 (page 23).
Research accessed 1 October 2026. The EPA and Building Science Corporation documents are US sources and describe general building-science principles, not Indian construction specifications. The CPWD manual is an Indian maintenance manual for government buildings. Rainfall figures come from the studies cited and are not a forecast. The images illustrate atmosphere and spatial ideas, not verified drainage or structural performance.