7 Signs It's Time to Replace Your Siding (New England)

1. Paint that will not hold

If you are repainting wood siding every three or four years, the paint is not the problem. Paint fails early when moisture is moving through the board from behind — which means the weather barrier, the flashing or the ventilation is not doing its job.

Repainting treats the symptom. On a New England home with repeated failure on the same elevation, the money is better spent finding out why the wall is wet.

2. Boards that are cupped, split or loose

Cupping is water absorbed unevenly. Splitting at the nail line is a board that has moved through too many freeze-thaw cycles. One or two boards is a repair. A whole wall of it means the material has reached the end of its service life, and replacing individual boards becomes an endless chase.

3. Soft spots when you press

Push on the siding with the heel of your hand at the bottom of a wall, near a window, and under the roofline. Anything that gives is telling you the sheathing behind it is wet. This is the sign that should move a project up your list: sheathing rot spreads sideways along the wall and it does not stop on its own.

4. Bubbling, blistering or warped vinyl

Vinyl that has bubbled has trapped moisture behind it. Vinyl that has warped or sagged has usually been installed too tight — vinyl needs room to expand, and a nail driven home instead of left loose will buckle a course in the first hot summer.

Warping near a grill or a reflective window is a different problem entirely: concentrated heat. That one is worth diagnosing before replacing, or the new siding does the same thing.

5. Fungus, mould or moss on the surface

Growth on the north side of a house is common in Massachusetts and often just needs cleaning. Growth in the seams, or in a vertical stripe running down from a window or a roof junction, is following a water path — and that water path is inside the wall too.

6. Heating and cooling bills creeping up

Siding itself insulates very little; the wall behind it does. But failed siding lets water into that assembly, and wet insulation stops insulating. A steady climb in usage over several seasons, with no rate change and no new appliances, points at the envelope.

7. You can see it from the street

This is the least technical sign and the one that most often triggers the call. Faded, patchy, mismatched siding is the first thing a visitor and an appraiser both register. If you are within a few years of selling, it is also the item most likely to come back in a buyer's inspection.

What replacement runs in Massachusetts

Installed siding is commonly reported at $4 to $13 per square foot, or roughly $10,000 to $32,500 on a 2,500-square-foot home. Boston-area vinyl figures run higher — $6 to $24 per square foot — which on a median 1,700-square-foot home lands between about $10,200 and $40,800.

The number that is not on any quote

What tear-off uncovers. On a house over thirty years old, some rot around openings is the normal case rather than the exception. A quote with no allowance for sheathing replacement is not cheaper — it is incomplete, and the difference shows up as a change order once the wall is open.

Ask every contractor for their per-sheet rate for replacing sheathing, and what happens if they find rot. We put that number in the siding replacement estimate before we start.

Nobody has ever regretted budgeting for what was behind the siding. Plenty of people have been surprised by it.