Can You Put Metal Roofing on Only One Side of a House?

It may be possible to install metal roofing on only one side of a house, but the decision depends on where the new work stops and how it connects to the remaining roof. A complete roof plane separated by a ridge or wall is a different proposal from a patch halfway down an existing slope. The connecting details, condition of the retained roof, drainage, and future replacement plan matter more than simply buying half as many panels.

If you want a metal roof now but do not want to replace a sound section unnecessarily, ask for a phased plan. Do not assume that partial work is either always sensible or automatically a bad idea.

What does “one side” mean on your roof?

Start with a marked roof photograph or drawing. Identify the exact planes to replace and the boundaries the contractor will disturb. On a simple gable roof, one side may meet the other at a ridge. On a roof with hips, valleys, dormers, and additions, the requested area may share several complicated connections.

Ask the contractor to distinguish three scopes: the roof covering being replaced, the adjacent material that must temporarily be disturbed, and the flashing or trim being rebuilt. Those areas are not necessarily identical. A proposal labeled “rear slope only” is incomplete if it leaves responsibility for the shared ridge unclear.

Which connections need the most attention?

The ridge or hip

Ask how the new material and the retained roof will terminate, and whether the joint is vented. A ridge cap is not a universal adapter between any two roofing systems. McElroy's Medallion-Lok manual, for example, provides system-specific ridge, hip, and closure details. It illustrates why the selected panel's instructions matter; it does not approve a mixed-roof detail for your house. Source: McElroy Metal, Medallion-Lok installation manual.

Valleys, walls, and changes in slope

Where the two scopes share a valley, ask who owns the entire water path, not just each side's panels. At walls, roofing, flashing, and the wall's drainage layer need to work together. DOE's Building America guidance emphasizes that these layers must direct water outward rather than behind the wall finish. Source: Building America Solution Center, roof-wall flashing in existing homes.

McElroy also calls for manufacturer involvement in slope transitions between metal roof areas and notes that panel details must accommodate thermal movement. A transition should be selected and drawn for the project, not improvised with a large strip of sealant. Source: McElroy Metal, standing-seam design considerations.

When is partial replacement worth considering?

It deserves evaluation when the retained roof has a documented reason to remain: it is a different age, has been inspected, or serves a separate section of the building. The strongest proposal explains both why the new work is needed and why the other area can reasonably stay.

Ask for photographs and findings for the retained roof, not just a quotation for the desired metal. If its condition is unknown, a phased project may be postponing a decision rather than making an informed one.

Conversely, ask whether shared details will need to be rebuilt again when the second phase happens. A smaller first bill can include duplicated setup, access, and flashing work later. Have the contractor compare the scopes without inventing a lifespan for the older roof or promising that today's finish will be available indefinitely.

Our repair-versus-replacement guide can help organize that conversation. If both slopes share an attic, also discuss the whole space using our Tennessee attic-ventilation guide.

Can metal and shingles coexist?

They can be part of a professionally designed roof, but sharing a house does not make every connection suitable. The contractor should identify the boundary detail and any panel-manufacturer requirements. The Metal Roofers is a metal-roofing specialist; ask how work involving retained nonmetal roofing will be coordinated rather than assuming a general shingle-installation service is included.

Metal compatibility matters too. The Metal Construction Association warns that certain combinations of metals and moisture can accelerate corrosion. Ask about existing copper flashing, gutters, fasteners, and runoff before choosing adjacent materials. Compatibility is more than matching colors. Source: MCA, Dissimilar Metal Corrosion in Roofing Installations.

What about permits, warranties, and the next phase?

“Only one side” is not a permit determination. Nashville's published renovation guidance lists new roofing layers and replacement exceeding one-third of the roof among permit-triggering work. Confirm the entire scope with the correct authority; nearby municipalities and counties may have different procedures. Source: Metro Nashville renovation permit guidance.

Request written warranty boundaries. Who covers the new metal, shared flashing, and a leak whose source is uncertain? Does the retained roof have a warranty that could be affected by disturbance? Keep the panel profile, manufacturer, coating, color, and project details for future work. A color name alone is not a complete specification.

Questions that make partial-roof quotes comparable

• Can you mark exactly what is replaced, disturbed, and retained?
• What condition supports keeping the other roof area?
• How are the ridge, valleys, and wall connections handled?
• Will the attic's existing ventilation strategy remain appropriate?
• What work would be repeated in a later phase?
• Who handles leaks at the boundary, and what does the warranty actually cover?

Frequently asked questions

Can I put metal on the front and leave the back alone?

Possibly. Ask for a condition assessment and a defined connection detail. A front-versus-back decision based only on street appearance can overlook the shared ridge and roof sections out of view.

Will replacing half the roof cost exactly half as much?

Do not assume that. Request a scope-based price. Access, setup, edge details, and shared transitions do not necessarily shrink in direct proportion to the covered area.

Can the new metal stop halfway down a slope?

That needs specific design review. It creates a different water-management problem from replacing a complete plane. Ask why that boundary is appropriate and what manufacturer-supported detail will be used.

Can I match the second half years later?

A match cannot be guaranteed without checking future product availability and the appearance of the weathered roof. Save specifications and discuss whether a deliberate contrast would be acceptable if an exact match is unavailable.

Does metal on one side fix leaks on the other?

No. Define which reported leaks the project addresses. A new roof section is not evidence that all remaining sections and penetrations are sound.

Ask for a plan, not a guess

Ask The Metal Roofers to evaluate your partial-roof idea. Tell us which areas you want to retain and why. The goal is a clearly defined metal-roof project with understandable boundaries, not unnecessary replacement.

Sources and scope

The linked manufacturer manuals, DOE technical guidance, MCA bulletin, and Nashville permit guidance support the specific considerations above. None is a field study proving that partial replacement will work on an uninspected house.

• McElroy Metal: Medallion-Lok installation manual.
• McElroy Metal: Standing-seam design considerations.
• DOE Building America: Existing-home roof-wall flashing.
• MCA: Dissimilar metal corrosion.
• Metro Nashville: Renovation permits.