Repair or replace exterior render – when is each worthwhile?

Local repair may be appropriate when the cause is addressed and surrounding render is suitable for retention, but widespread defects require an assessment of the wall and repair options. The decision cannot be reduced to a percentage of visible damage.

The cause and extent of defects, the condition of retained material and the wall construction guide the decision. A qualified assessment should define what can remain and whether local repairs will address the problem.

Widespread detachment, deep deterioration or signs of corrosion warrant investigation. They do not automatically require replacing every wall; establish the cause and extent before specifying work. For paint-system selection, see mineral versus plastic-based paint on render.

Different elevations may need different work, but the scope should follow the actual assessment. For repair and painting enquiries, see complete façade renovation, while work on masonry walls is described on the page for local rendered and brick façades.

Cracks, detached material, hollow-sounding areas or recurring damp indicate a need for assessment; record the location and changes, then have the cause and repair scope established. Several symptoms do not automatically prove that all render needs replacement.

Look at adhesion, cracking, detached areas, moisture signs and the coating condition together. Testing should suit the wall system and avoid damaging unstable material.

No single symptom should be ignored or treated as a complete diagnosis. New or changing cracks, loose material and water ingress warrant timely assessment.

Interpret signs together and investigate their cause. Flaking, chalking or hollow sounds may have different explanations. Do not prescribe new render, paint removal or repainting solely from a symptom list.

The cost comparison depends on the actual repair and replacement scopes, including preparation, compatible materials, access and any underlying work. Obtain like-for-like itemised quotes rather than assuming one method always costs less.

Area, condition, access and the repair specification affect cost. Any ROT applies only to qualifying labour when the conditions are met. A quotation for rerendering the entire façade must state removal, new render, finishing and any other included work. Compare this with a properly specified repair option; no 30% threshold decides the financial choice.

In 2026, eligible customers may receive ROT of up to 30% of qualifying labour, capped at 50,000 SEK per person per year. Two owners must each qualify, pay their share and have sufficient tax capacity and allowance; two adults living in the house is not enough on its own. Materials are excluded. For the relevant surface rates, see façade renovation price list. If comparing render with entirely new timber cladding, corresponding rates are in our timber cladding replacement price list. The exact amount is fixed after a site visit, because a sound house and a frost-damaged 1930s house need very different work.

The service life of a rendered façade depends on its construction, materials, exposure, detailing and maintenance. The present condition and defect causes guide repairs; age alone does not establish the remaining life.

Durability depends on addressing underlying defects and using compatible repairs and coatings. Replacing render does not itself remove every moisture or construction issue; the specification must cover the actual cause.

Compare whether each option addresses the defect cause, how much sound material can remain and the maintenance it requires. A budget or arbitrary percentage does not establish suitability. The paint-system comparison explains related coating questions.

Agree the assessment and its scope before ordering render repairs: it should establish adhesion, cracking, moisture concerns and suitable repair options. This guide does not confirm a universal NLL testing procedure or damage threshold.

Use documented observations and any appropriate investigation to support the decision. Ask how these points will be checked for the actual wall:

1. Assess adhesion using methods appropriate for the existing render system.
2. Record crack locations and changes, and investigate the cause where needed.
3. Investigate damp or salt deposits where present; the necessary tests depend on the wall and symptoms.
4. Map the areas proposed for retention or repair and explain the choice of method.

Ask for a written scope identifying investigation, repairs, materials and painting separately. The evidence should explain why the proposed work addresses the actual defects. Confirm any ROT eligibility, timing and warranty terms for that project; contact 076-227 97 68 to discuss an assessment.