Why Can Two Southsea Homes Feel Completely Different On The Same Windy Day?

Two homes on the same Southsea street can experience exactly the same windy weather and still feel completely different inside.

One may remain comfortable while the other develops a noticeable cold draught, colder upper rooms or a floor that suddenly feels much less comfortable.

The difference comes from how each building is exposed, constructed, altered and insulated.

The weather is shared; the building response is not

It is tempting to assume that neighbouring homes should feel similar because they experience the same outdoor conditions.

But even small differences in construction can change how quickly a property loses heat or how noticeable draughts become.

Orientation can make one side of a street feel different

The direction a home faces influences which walls and windows are most exposed during particular weather conditions.

A front room facing into the prevailing wind may feel different from a similar room on the sheltered side of another property.

This does not automatically mean either home is defective.

Neighbouring buildings can provide useful shelter

Southsea has many streets where houses sit relatively close together.

That can shelter some façades from direct wind exposure while leaving others more open.

Even within the same terrace, the exact position of the property can influence how exposed it feels.

Mid-terrace and end-of-terrace homes have different exposed areas

A mid-terrace property shares walls with neighbouring homes on both sides.

An end-of-terrace property has an additional external wall.

That creates more exposed building fabric and can change the way the home behaves in colder or windy conditions.

It does not automatically mean the end property will be uncomfortable, but the thermal envelope is different.

Top-floor and ground-floor homes can experience different weak points

In converted buildings or flats, position within the property can matter.

A top-floor space may be more influenced by the roof above.

A ground-floor room may be more affected by the floor construction beneath.

This means two homes within the same building can have different insulation priorities.

Loft insulation can vary significantly between neighbouring properties

One home may have recently upgraded loft insulation, while the neighbouring property may contain older, shallower or disturbed material.

That difference can be difficult to see from outside but can affect comfort in rooms beneath the roof.

Floors can be different even in similar homes

A suspended floor may have been insulated in one property but left unchanged in another.

Alterations over the years can also mean that different sections of the same home have different floor types.

Where appropriate, underfloor insulation can help reduce heat loss through a suitable floor structure.

Glazing can completely change the feel of a room

Neighbouring properties may have different windows despite being originally built to the same design.

Differences in:

• glazing type
• frame condition
• seals
• window size
• surrounding junctions

can all affect how a room feels during exposed weather.

Air leakage can make one home feel much draughtier

Small gaps around windows, doors, hatches or services may be present in one property but not another.

When the wind picks up, those differences can become much easier to notice.

Our earlier article explains why cold draughts feel worse in windy weather and why a draught should not automatically be treated as an insulation problem.

Extensions can change the original building completely

Two neighbouring homes may have started out with almost identical layouts.

Years later, one may have:

• a rear extension
• a loft conversion
• different glazing
• new flooring
• altered heating

while the other remains closer to the original construction.

They may still look similar from the street but behave very differently thermally.

Thermal bridging can be localised

Thermal bridging occurs at specific parts of the structure where heat can pass more easily.

Different alterations and insulation histories can mean those weak points are more noticeable in one home than another.

Heating can hide some of these differences

A property with higher heating output may still feel warm despite losing heat more quickly.

Another home may run the heating less but retain warmth more effectively.

This means comfort alone does not tell the entire story about insulation performance.

One cold room can change the experience of the whole home

The property does not need to feel uniformly cold for an issue to become noticeable.

A single exposed bedroom, extension or ground-floor room can make the overall house feel less comfortable.

That is why localised symptoms can be useful when deciding where to investigate.

Why does your Southsea home behave differently?

Local weather gives context, not the specification

Southsea’s coastal setting helps explain why windy conditions can be noticeable.

But the postcode does not tell us whether a particular home needs more loft insulation, better floor insulation, draught-proofing or no insulation work at all.

That depends on the building.

The best approach is to identify how the individual property responds to the weather and then target the actual weak point.

Frequently asked questions