El plazo de subsanación nos permite subsanar la solicitud.

It is a formal administrative expression in Spain.

• plazo = a time limit, deadline, or set period
• subsanación = the act of correcting or remedying a problem, omission, or defect in paperwork

So plazo de subsanación is the period you are given to fix issues in an application or official procedure.

Subsanar means to correct, to remedy, or to fix a defect, especially in formal, legal, or administrative contexts.

It is not one of the most common everyday verbs in casual conversation. In normal speech, people might more often say things like:

• corregir
• arreglar
• solucionar

But in bureaucracy, official letters, and legal Spanish, subsanar is very common.

Yes, it is repetitive, but it is very typical of formal administrative Spanish.

• subsanación is the noun: correction/remedying
• subsanar is the verb: to correct/to remedy

Official Spanish often repeats the same root in a way that sounds stiff or bureaucratic. A more natural everyday style might avoid that repetition, but in legal or administrative language it is normal.

Nos means us.

In nos permite, it is the indirect object of permitir and means allows us or gives us permission.

So:

• permite = allows
• nos permite = allows us

It tells you who is being allowed to do the action.

Because after permitir, Spanish very often uses this structure:

permitir + indirect object + infinitive

So:

• nos permite subsanar = it allows us to correct

This is the most direct and natural structure here.

You can sometimes find permitir que + subjunctive, especially in other contexts, but with the same person doing the action, the infinitive structure is usually the simplest and most common choice.

The implied subject of subsanar is the same people referred to by nos.

So in:

El plazo de subsanación nos permite subsanar la solicitud

the meaning is:

• the correction period allows us
• for us to correct the application

Spanish does not need to repeat the subject before the infinitive.

Because it refers to a specific application already known in the context.

In official procedures, people often talk about a particular document already submitted, so la solicitud means the application.

Using the article sounds natural because both speaker and listener know which application is being discussed.

Not always. Solicitud can mean several things depending on context, such as:

• application
• request
• petition

In administrative Spanish from Spain, solicitud very often means application, especially when talking about forms or official procedures.

This is a very common Spanish noun structure:

noun + de + noun

Here it means something like:

• period of correction
• more naturally in English, period for correcting or correction period

Spanish often uses de where English might prefer for or an adjective.

Other similar patterns are:

• plazo de presentación
• documento de identidad
• solicitud de admisión

So de is just part of the standard noun phrase structure.

It is natural in administrative or legal Spanish, but it sounds very formal and bureaucratic.

A more everyday way to express a similar idea might be something like:

• Este plazo nos permite corregir la solicitud
• Tenemos este plazo para corregir la solicitud

So the original sentence is correct and natural, but mainly in official contexts.

In standard Peninsular Spanish, the z in plazo and the c before i in solicitud are pronounced with the th sound of English think.

So roughly:

• plazo ≈ PLA-tho
• solicitud ≈ so-li-thi-TUD

In subsanación, the c before ió is pronounced like th as well in Spain:

• subsanación ≈ sub-sa-na-THYON

This is one of the main pronunciation features that distinguishes Spain from most of Latin America, where those sounds are usually pronounced like s.