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The mending cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Mending, spell description says:  

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MMintro to the Monster Manual says, under "Type":  

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

If you are usingThe description of the Wayfinder's Guide to Eberronwarforged race in the Wayfinder's Guide to Eberron (p. 67) says, under the "Living Steel and Stone" heading (emphasis mine):

While they’re formed from stone and steel, warforged are living humanoids. Resting, healing magichealing magic, and the Medicine skill all provide the same benefits to warforged that they do to other humanoids. (WFGtE, p. 67)

The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Mending, spell description says:  

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MM says:  

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

If you are using the Wayfinder's Guide to Eberron

While they’re formed from stone and steel, warforged are living humanoids. Resting, healing magic, and the Medicine skill all provide the same benefits to warforged that they do to other humanoids. (WFGtE, p. 67)

The mending cantrip specifically says it can repair constructs, but it doesn't give an HP value associated with that:

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The intro to the Monster Manual says, under "Type":

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

The description of the warforged race in the Wayfinder's Guide to Eberron (p. 67) says, under the "Living Steel and Stone" heading (emphasis mine):

While they’re formed from stone and steel, warforged are living humanoids. Resting, healing magic, and the Medicine skill all provide the same benefits to warforged that they do to other humanoids.

3 added 275 characters in body
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The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Mending, spell description says:

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MM says:

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

If you are using the Wayfinder's Guide to Eberron

While they’re formed from stone and steel, warforged are living humanoids. Resting, healing magic, and the Medicine skill all provide the same benefits to warforged that they do to other humanoids. (WFGtE, p. 67)

The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Mending, spell description says:

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MM says:

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Mending, spell description says:

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MM says:

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

If you are using the Wayfinder's Guide to Eberron

While they’re formed from stone and steel, warforged are living humanoids. Resting, healing magic, and the Medicine skill all provide the same benefits to warforged that they do to other humanoids. (WFGtE, p. 67)

2 added 403 characters in body
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The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Any thoughts on this? Mending, spell description says:

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MM says:

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Any thoughts on this?

The cantrip mending specifically says it can repair constructs, but it doesn't give an HP value associated with that. Mending, spell description says:

This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.

The MM says:

Constructs are made, not born. Some are programmed by their creators to follow a simple set of instructions, while others are imbued with sentience and capable of independent thought. Golems are the iconic constructs. Many creatures native to the outer plane of Mechanus, such as modrons, are constructs shaped from the raw material of the plane by the will of more powerful creatures.

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