diff --git a/packages/builders/src/components/Component.ts b/packages/builders/src/components/Component.ts
index 9a9a59d12b3d..4efb352e77b4 100644
--- a/packages/builders/src/components/Component.ts
+++ b/packages/builders/src/components/Component.ts
@@ -1,5 +1,6 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIBaseComponent, ComponentType } from 'discord-api-types/v10';
+import { Refineable } from '../mixins/Refineable.js';
 
 export interface ComponentBuilderBaseData {
 	id?: number | undefined;
@@ -11,6 +12,7 @@ export interface ComponentBuilderBaseData {
  * @typeParam Component - The type of API data that is stored within the builder
  */
 export abstract class ComponentBuilder<Component extends APIBaseComponent<ComponentType>>
+	extends Refineable
 	implements JSONEncodable<Component>
 {
 	/**
diff --git a/packages/builders/src/components/selectMenu/StringSelectMenuOption.ts b/packages/builders/src/components/selectMenu/StringSelectMenuOption.ts
index de024c23e7ed..2af68d61a250 100644
--- a/packages/builders/src/components/selectMenu/StringSelectMenuOption.ts
+++ b/packages/builders/src/components/selectMenu/StringSelectMenuOption.ts
@@ -1,12 +1,13 @@
 import type { JSONEncodable } from '@discordjs/util';
-import type { APIMessageComponentEmoji, APISelectMenuOption } from 'discord-api-types/v10';
+import type { APISelectMenuOption, APIMessageComponentEmoji } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { validate } from '../../util/validation.js';
 import { selectMenuStringOptionPredicate } from '../Assertions.js';
 
 /**
  * A builder that creates API-compatible JSON data for string select menu options.
  */
-export class StringSelectMenuOptionBuilder implements JSONEncodable<APISelectMenuOption> {
+export class StringSelectMenuOptionBuilder extends Refineable implements JSONEncodable<APISelectMenuOption> {
 	private readonly data: Partial<APISelectMenuOption>;
 
 	/**
@@ -32,6 +33,7 @@ export class StringSelectMenuOptionBuilder implements JSONEncodable<APISelectMen
 	 * ```
 	 */
 	public constructor(data: Partial<APISelectMenuOption> = {}) {
+		super();
 		this.data = structuredClone(data);
 	}
 
diff --git a/packages/builders/src/components/v2/MediaGalleryItem.ts b/packages/builders/src/components/v2/MediaGalleryItem.ts
index e6762009188b..0c820b2a28b1 100644
--- a/packages/builders/src/components/v2/MediaGalleryItem.ts
+++ b/packages/builders/src/components/v2/MediaGalleryItem.ts
@@ -1,9 +1,10 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIMediaGalleryItem } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { validate } from '../../util/validation.js';
 import { mediaGalleryItemPredicate } from './Assertions.js';
 
-export class MediaGalleryItemBuilder implements JSONEncodable<APIMediaGalleryItem> {
+export class MediaGalleryItemBuilder extends Refineable implements JSONEncodable<APIMediaGalleryItem> {
 	private readonly data: Partial<APIMediaGalleryItem>;
 
 	/**
@@ -32,6 +33,7 @@ export class MediaGalleryItemBuilder implements JSONEncodable<APIMediaGalleryIte
 	 * ```
 	 */
 	public constructor(data: Partial<APIMediaGalleryItem> = {}) {
+		super();
 		this.data = structuredClone(data);
 	}
 
diff --git a/packages/builders/src/interactions/commands/Command.ts b/packages/builders/src/interactions/commands/Command.ts
index 89016d18bf0a..b06cf5ba3d37 100644
--- a/packages/builders/src/interactions/commands/Command.ts
+++ b/packages/builders/src/interactions/commands/Command.ts
@@ -5,6 +5,7 @@ import type {
 	Permissions,
 	RESTPostAPIApplicationCommandsJSONBody,
 } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import type { RestOrArray } from '../../util/normalizeArray.js';
 import { normalizeArray } from '../../util/normalizeArray.js';
 
@@ -20,6 +21,7 @@ export interface CommandData
  * The base class for all command builders.
  */
 export abstract class CommandBuilder<Command extends RESTPostAPIApplicationCommandsJSONBody>
+	extends Refineable
 	implements JSONEncodable<Command>
 {
 	/**
diff --git a/packages/builders/src/interactions/commands/SharedName.ts b/packages/builders/src/interactions/commands/SharedName.ts
index c9625bd180bb..6d3a2dd2eb91 100644
--- a/packages/builders/src/interactions/commands/SharedName.ts
+++ b/packages/builders/src/interactions/commands/SharedName.ts
@@ -1,4 +1,5 @@
 import type { Locale, RESTPostAPIApplicationCommandsJSONBody } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 
 export interface SharedNameData
 	extends Partial<Pick<RESTPostAPIApplicationCommandsJSONBody, 'name_localizations' | 'name'>> {}
@@ -6,7 +7,7 @@ export interface SharedNameData
 /**
  * This mixin holds name and description symbols for chat input commands.
  */
-export class SharedName {
+export class SharedName extends Refineable {
 	/**
 	 * @internal
 	 */
diff --git a/packages/builders/src/interactions/modals/Modal.ts b/packages/builders/src/interactions/modals/Modal.ts
index 882125fe751b..755b8b0fed01 100644
--- a/packages/builders/src/interactions/modals/Modal.ts
+++ b/packages/builders/src/interactions/modals/Modal.ts
@@ -9,6 +9,7 @@ import type { AnyModalComponentBuilder } from '../../components/Components.js';
 import { createComponentBuilder } from '../../components/Components.js';
 import { LabelBuilder } from '../../components/label/Label.js';
 import { TextDisplayBuilder } from '../../components/v2/TextDisplay.js';
+import { Refineable } from '../../mixins/Refineable.js';
 import { normalizeArray, type RestOrArray } from '../../util/normalizeArray.js';
 import { resolveBuilder } from '../../util/resolveBuilder.js';
 import { validate } from '../../util/validation.js';
@@ -21,7 +22,7 @@ export interface ModalBuilderData extends Partial<Omit<APIModalInteractionRespon
 /**
  * A builder that creates API-compatible JSON data for modals.
  */
-export class ModalBuilder implements JSONEncodable<APIModalInteractionResponseCallbackData> {
+export class ModalBuilder extends Refineable implements JSONEncodable<APIModalInteractionResponseCallbackData> {
 	/**
 	 * The API data associated with this modal.
 	 */
@@ -40,6 +41,7 @@ export class ModalBuilder implements JSONEncodable<APIModalInteractionResponseCa
 	 * @param data - The API data to create this modal with
 	 */
 	public constructor(data: Partial<APIModalInteractionResponseCallbackData> = {}) {
+		super();
 		const { components = [], ...rest } = data;
 
 		this.data = {
diff --git a/packages/builders/src/messages/AllowedMentions.ts b/packages/builders/src/messages/AllowedMentions.ts
index 9a094a3f06ae..6e3f70dd55ad 100644
--- a/packages/builders/src/messages/AllowedMentions.ts
+++ b/packages/builders/src/messages/AllowedMentions.ts
@@ -1,5 +1,6 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { AllowedMentionsTypes, APIAllowedMentions, Snowflake } from 'discord-api-types/v10';
+import { Refineable } from '../mixins/Refineable.js';
 import { normalizeArray, type RestOrArray } from '../util/normalizeArray.js';
 import { validate } from '../util/validation.js';
 import { allowedMentionPredicate } from './Assertions.js';
@@ -7,7 +8,7 @@ import { allowedMentionPredicate } from './Assertions.js';
 /**
  * A builder that creates API-compatible JSON data for allowed mentions.
  */
-export class AllowedMentionsBuilder implements JSONEncodable<APIAllowedMentions> {
+export class AllowedMentionsBuilder extends Refineable implements JSONEncodable<APIAllowedMentions> {
 	/**
 	 * The API data associated with these allowed mentions.
 	 */
@@ -19,7 +20,8 @@ export class AllowedMentionsBuilder implements JSONEncodable<APIAllowedMentions>
 	 * @param data - The API data to create this allowed mentions with
 	 */
 	public constructor(data: Partial<APIAllowedMentions> = {}) {
-		this.data = structuredClone(data);
+		super();
+		this.data = { ...structuredClone(data) };
 	}
 
 	/**
diff --git a/packages/builders/src/messages/Attachment.ts b/packages/builders/src/messages/Attachment.ts
index a6cdb58b798a..450cbc2f91ee 100644
--- a/packages/builders/src/messages/Attachment.ts
+++ b/packages/builders/src/messages/Attachment.ts
@@ -1,12 +1,13 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { RESTAPIAttachment, Snowflake } from 'discord-api-types/v10';
+import { Refineable } from '../mixins/Refineable.js';
 import { validate } from '../util/validation.js';
 import { attachmentPredicate } from './Assertions.js';
 
 /**
  * A builder that creates API-compatible JSON data for attachments.
  */
-export class AttachmentBuilder implements JSONEncodable<RESTAPIAttachment> {
+export class AttachmentBuilder extends Refineable implements JSONEncodable<RESTAPIAttachment> {
 	/**
 	 * The API data associated with this attachment.
 	 */
@@ -15,10 +16,11 @@ export class AttachmentBuilder implements JSONEncodable<RESTAPIAttachment> {
 	/**
 	 * Creates a new attachment builder.
 	 *
-	 * @param data - The API data to create this attachment with
+	 * @param attachment - The attachment to build from
 	 */
-	public constructor(data: Partial<RESTAPIAttachment> = {}) {
-		this.data = structuredClone(data);
+	public constructor(attachment: Partial<RESTAPIAttachment> = {}) {
+		super();
+		this.data = { ...structuredClone(attachment) };
 	}
 
 	/**
diff --git a/packages/builders/src/messages/Message.ts b/packages/builders/src/messages/Message.ts
index 1c7521e8a20a..dfddef06f1c3 100644
--- a/packages/builders/src/messages/Message.ts
+++ b/packages/builders/src/messages/Message.ts
@@ -28,6 +28,7 @@ import { MediaGalleryBuilder } from '../components/v2/MediaGallery.js';
 import { SectionBuilder } from '../components/v2/Section.js';
 import { SeparatorBuilder } from '../components/v2/Separator.js';
 import { TextDisplayBuilder } from '../components/v2/TextDisplay.js';
+import { Refineable } from '../mixins/Refineable.js';
 import { normalizeArray, type RestOrArray } from '../util/normalizeArray.js';
 import { resolveBuilder } from '../util/resolveBuilder.js';
 import { validate } from '../util/validation.js';
@@ -56,7 +57,7 @@ export interface MessageBuilderData
 /**
  * A builder that creates API-compatible JSON data for messages.
  */
-export class MessageBuilder implements JSONEncodable<RESTPostAPIChannelMessageJSONBody> {
+export class MessageBuilder extends Refineable implements JSONEncodable<RESTPostAPIChannelMessageJSONBody> {
 	/**
 	 * The API data associated with this message.
 	 */
@@ -89,6 +90,7 @@ export class MessageBuilder implements JSONEncodable<RESTPostAPIChannelMessageJS
 	 * @param data - The API data to create this message with
 	 */
 	public constructor(data: Partial<RESTPostAPIChannelMessageJSONBody> = {}) {
+		super();
 		const { attachments = [], embeds = [], components = [], message_reference, poll, allowed_mentions, ...rest } = data;
 
 		this.data = {
diff --git a/packages/builders/src/messages/MessageReference.ts b/packages/builders/src/messages/MessageReference.ts
index 5a026f5e7f43..c5914778fbf1 100644
--- a/packages/builders/src/messages/MessageReference.ts
+++ b/packages/builders/src/messages/MessageReference.ts
@@ -1,12 +1,13 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { MessageReferenceType, RESTAPIMessageReference, Snowflake } from 'discord-api-types/v10';
+import { Refineable } from '../mixins/Refineable.js';
 import { validate } from '../util/validation.js';
 import { messageReferencePredicate } from './Assertions.js';
 
 /**
  * A builder that creates API-compatible JSON data for message references.
  */
-export class MessageReferenceBuilder implements JSONEncodable<RESTAPIMessageReference> {
+export class MessageReferenceBuilder extends Refineable implements JSONEncodable<RESTAPIMessageReference> {
 	/**
 	 * The API data associated with this message reference.
 	 */
@@ -18,6 +19,7 @@ export class MessageReferenceBuilder implements JSONEncodable<RESTAPIMessageRefe
 	 * @param data - The API data to create this message reference with
 	 */
 	public constructor(data: Partial<RESTAPIMessageReference> = {}) {
+		super();
 		this.data = structuredClone(data);
 	}
 
diff --git a/packages/builders/src/messages/embed/Embed.ts b/packages/builders/src/messages/embed/Embed.ts
index 9fbaf2699d5d..7ab229a2f7a8 100644
--- a/packages/builders/src/messages/embed/Embed.ts
+++ b/packages/builders/src/messages/embed/Embed.ts
@@ -1,5 +1,6 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIEmbed, APIEmbedAuthor, APIEmbedField, APIEmbedFooter } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import type { RestOrArray } from '../../util/normalizeArray.js';
 import { normalizeArray } from '../../util/normalizeArray.js';
 import { resolveBuilder } from '../../util/resolveBuilder.js';
@@ -21,7 +22,7 @@ export interface EmbedBuilderData extends Omit<APIEmbed, 'author' | 'fields' | '
 /**
  * A builder that creates API-compatible JSON data for embeds.
  */
-export class EmbedBuilder implements JSONEncodable<APIEmbed> {
+export class EmbedBuilder extends Refineable implements JSONEncodable<APIEmbed> {
 	/**
 	 * The API data associated with this embed.
 	 */
@@ -40,6 +41,7 @@ export class EmbedBuilder implements JSONEncodable<APIEmbed> {
 	 * @param data - The API data to create this embed with
 	 */
 	public constructor(data: Partial<APIEmbed> = {}) {
+		super();
 		const { author, fields = [], footer, ...rest } = data;
 
 		this.data = {
diff --git a/packages/builders/src/messages/embed/EmbedAuthor.ts b/packages/builders/src/messages/embed/EmbedAuthor.ts
index e39e1ed20e45..7faeeb400041 100644
--- a/packages/builders/src/messages/embed/EmbedAuthor.ts
+++ b/packages/builders/src/messages/embed/EmbedAuthor.ts
@@ -1,24 +1,26 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIEmbedAuthor } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { validate } from '../../util/validation.js';
 import { embedAuthorPredicate } from './Assertions.js';
 
 /**
- * A builder that creates API-compatible JSON data for the embed author.
+ * A builder that creates API-compatible JSON data for embed authors.
  */
-export class EmbedAuthorBuilder implements JSONEncodable<APIEmbedAuthor> {
+export class EmbedAuthorBuilder extends Refineable implements JSONEncodable<APIEmbedAuthor> {
 	/**
 	 * The API data associated with this embed author.
 	 */
 	private readonly data: Partial<APIEmbedAuthor>;
 
 	/**
-	 * Creates a new embed author.
+	 * Creates a new embed author builder.
 	 *
 	 * @param data - The API data to create this embed author with
 	 */
 	public constructor(data: Partial<APIEmbedAuthor> = {}) {
-		this.data = structuredClone(data);
+		super();
+		this.data = { ...structuredClone(data) };
 	}
 
 	/**
diff --git a/packages/builders/src/messages/embed/EmbedField.ts b/packages/builders/src/messages/embed/EmbedField.ts
index 9466ca267968..76a4a91afac4 100644
--- a/packages/builders/src/messages/embed/EmbedField.ts
+++ b/packages/builders/src/messages/embed/EmbedField.ts
@@ -1,24 +1,26 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIEmbedField } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { validate } from '../../util/validation.js';
 import { embedFieldPredicate } from './Assertions.js';
 
 /**
  * A builder that creates API-compatible JSON data for embed fields.
  */
-export class EmbedFieldBuilder implements JSONEncodable<APIEmbedField> {
+export class EmbedFieldBuilder extends Refineable implements JSONEncodable<APIEmbedField> {
 	/**
 	 * The API data associated with this embed field.
 	 */
 	private readonly data: Partial<APIEmbedField>;
 
 	/**
-	 * Creates a new embed field.
+	 * Creates a new embed field builder.
 	 *
 	 * @param data - The API data to create this embed field with
 	 */
 	public constructor(data: Partial<APIEmbedField> = {}) {
-		this.data = structuredClone(data);
+		super();
+		this.data = { ...structuredClone(data) };
 	}
 
 	/**
diff --git a/packages/builders/src/messages/embed/EmbedFooter.ts b/packages/builders/src/messages/embed/EmbedFooter.ts
index 13da0d635e83..d357f8770195 100644
--- a/packages/builders/src/messages/embed/EmbedFooter.ts
+++ b/packages/builders/src/messages/embed/EmbedFooter.ts
@@ -1,24 +1,26 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIEmbedFooter } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { validate } from '../../util/validation.js';
 import { embedFooterPredicate } from './Assertions.js';
 
 /**
- * A builder that creates API-compatible JSON data for the embed footer.
+ * A builder that creates API-compatible JSON data for embed footers.
  */
-export class EmbedFooterBuilder implements JSONEncodable<APIEmbedFooter> {
+export class EmbedFooterBuilder extends Refineable implements JSONEncodable<APIEmbedFooter> {
 	/**
 	 * The API data associated with this embed footer.
 	 */
 	private readonly data: Partial<APIEmbedFooter>;
 
 	/**
-	 * Creates a new embed footer.
+	 * Creates a new embed footer builder.
 	 *
 	 * @param data - The API data to create this embed footer with
 	 */
 	public constructor(data: Partial<APIEmbedFooter> = {}) {
-		this.data = structuredClone(data);
+		super();
+		this.data = { ...structuredClone(data) };
 	}
 
 	/**
diff --git a/packages/builders/src/messages/poll/Poll.ts b/packages/builders/src/messages/poll/Poll.ts
index 24549c69c75f..7766d8641663 100644
--- a/packages/builders/src/messages/poll/Poll.ts
+++ b/packages/builders/src/messages/poll/Poll.ts
@@ -1,5 +1,6 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { RESTAPIPoll, APIPollMedia, PollLayoutType, APIPollAnswer } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { normalizeArray, type RestOrArray } from '../../util/normalizeArray.js';
 import { resolveBuilder } from '../../util/resolveBuilder.js';
 import { validate } from '../../util/validation.js';
@@ -15,7 +16,7 @@ export interface PollData extends Omit<RESTAPIPoll, 'answers' | 'question'> {
 /**
  * A builder that creates API-compatible JSON data for polls.
  */
-export class PollBuilder implements JSONEncodable<RESTAPIPoll> {
+export class PollBuilder extends Refineable implements JSONEncodable<RESTAPIPoll> {
 	/**
 	 * The API data associated with this poll.
 	 */
@@ -34,6 +35,7 @@ export class PollBuilder implements JSONEncodable<RESTAPIPoll> {
 	 * @param data - The API data to create this poll with
 	 */
 	public constructor(data: Partial<RESTAPIPoll> = {}) {
+		super();
 		const { question, answers = [], ...rest } = data;
 
 		this.data = {
diff --git a/packages/builders/src/messages/poll/PollAnswer.ts b/packages/builders/src/messages/poll/PollAnswer.ts
index c0574d294017..f92507a6f3cf 100644
--- a/packages/builders/src/messages/poll/PollAnswer.ts
+++ b/packages/builders/src/messages/poll/PollAnswer.ts
@@ -1,5 +1,6 @@
 import type { JSONEncodable } from '@discordjs/util';
 import type { APIPollAnswer, APIPollMedia } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 import { resolveBuilder } from '../../util/resolveBuilder';
 import { validate } from '../../util/validation';
 import { pollAnswerPredicate } from './Assertions';
@@ -12,7 +13,7 @@ export interface PollAnswerData extends Omit<APIPollAnswer, 'answer_id' | 'poll_
 /**
  * A builder that creates API-compatible JSON data for poll answers.
  */
-export class PollAnswerBuilder implements JSONEncodable<Omit<APIPollAnswer, 'answer_id'>> {
+export class PollAnswerBuilder extends Refineable implements JSONEncodable<Omit<APIPollAnswer, 'answer_id'>> {
 	/**
 	 * The API data associated with this poll answer.
 	 */
@@ -24,6 +25,7 @@ export class PollAnswerBuilder implements JSONEncodable<Omit<APIPollAnswer, 'ans
 	 * @param data - The API data to create this poll answer with
 	 */
 	public constructor(data: Partial<Omit<APIPollAnswer, 'answer_id'>> = {}) {
+		super();
 		const { poll_media, ...rest } = data;
 
 		this.data = {
diff --git a/packages/builders/src/messages/poll/PollMedia.ts b/packages/builders/src/messages/poll/PollMedia.ts
index 30f11c7ac4d7..ea2119d8aed8 100644
--- a/packages/builders/src/messages/poll/PollMedia.ts
+++ b/packages/builders/src/messages/poll/PollMedia.ts
@@ -1,9 +1,10 @@
 import type { APIPollMedia } from 'discord-api-types/v10';
+import { Refineable } from '../../mixins/Refineable.js';
 
 /**
  * The base poll media builder that contains common symbols for poll media builders.
  */
-export abstract class PollMediaBuilder {
+export abstract class PollMediaBuilder extends Refineable {
 	/**
 	 * The API data associated with this poll media.
 	 *
@@ -17,6 +18,7 @@ export abstract class PollMediaBuilder {
 	 * @param data - The API data to create this poll media with
 	 */
 	public constructor(data: Partial<APIPollMedia> = {}) {
+		super();
 		this.data = structuredClone(data);
 	}
 
diff --git a/packages/builders/src/mixins/Refineable.ts b/packages/builders/src/mixins/Refineable.ts
new file mode 100644
index 000000000000..075b8c4356c2
--- /dev/null
+++ b/packages/builders/src/mixins/Refineable.ts
@@ -0,0 +1,28 @@
+/**
+ * Mixin used to provide {@link Refineable.refine}
+ */
+export class Refineable {
+	/**
+	 * Refines this builder by applying the provided function to itself.
+	 * Useful for conditionally modifying the builder without breaking the method chain, while also isolating
+	 * the scope of temporary variables.
+	 *
+	 * @example
+	 * ```ts
+	 * const builder = new EmbedBuilder()
+	 *  .setTitle('Hello World')
+	 *  .setDescription('This is a description')
+	 *  .refine((b) => {
+	 * 		const intermediateValue = computeSomething();
+	 * 		b.setFooter(`Computed value: ${intermediateValue}`);
+	 *      if (externalVariable) {
+	 *         b.setColor(0xff0000);
+	 *     }
+	 *  });
+	 * ```
+	 */
+	public refine(fn: (builder: this) => void): this {
+		fn(this);
+		return this;
+	}
+}